Denver — flights from Philadelphia to Denver

Flight Deals from Philadelphia to Denver from $173

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Good to Know

Essential information to help you plan your flight from Philadelphia to Denver.

Timing Your Trip

The best day, time of day, season and booking window for this route.

Price Drop Deals

Frontier AirlinesFrontier Airlinesfound Oct 14
11/18/26
9:30 am
PHLPhiladelphia International Airport
13h 16mRDURaleigh Durham International Airport
11/18/26
8:46 pm
DENDenver International Airport
11/25/26
11:59 pm
DENDenver International Airport
3h 26m
11/26/26
5:25 am
PHLPhiladelphia International Airport
$226
Frontier AirlinesFrontier Airlinesfound Oct 14
11/18/26
12:36 pm
PHLPhiladelphia International Airport
10h 57mATLHartsfield Jackson Atlanta International Airport
11/18/26
9:33 pm
DENDenver International Airport
11/25/26
11:59 pm
DENDenver International Airport
3h 26m
11/26/26
5:25 am
PHLPhiladelphia International Airport
$232
Frontier AirlinesFrontier Airlinesfound Oct 14
11/18/26
10:37 am
PHLPhiladelphia International Airport
11h 23mMCOOrlando International Airport
11/18/26
8:00 pm
DENDenver International Airport
11/25/26
11:59 pm
DENDenver International Airport
3h 26m
11/26/26
5:25 am
PHLPhiladelphia International Airport
$235
Frontier AirlinesFrontier Airlinesfound Oct 14
11/18/26
6:00 am
PHLPhiladelphia International Airport
11h 53mDFWDallas Fort Worth International Airport
11/18/26
3:53 pm
DENDenver International Airport
11/25/26
11:59 pm
DENDenver International Airport
3h 26m
11/26/26
5:25 am
PHLPhiladelphia International Airport
$235
Flight plus hotel
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Frontier AirlinesFrontier Airlinesfound Oct 14
11/18/26
4:47 pm
PHLPhiladelphia International Airport
17h 42mMIAMiami International Airport
11/19/26
8:29 am
DENDenver International Airport
11/25/26
11:59 pm
DENDenver International Airport
3h 26m
11/26/26
5:25 am
PHLPhiladelphia International Airport
$235
Frontier AirlinesFrontier Airlinesfound Oct 14
11/18/26
2:45 pm
PHLPhiladelphia International Airport
19h 28mMCOOrlando International Airport
11/19/26
8:13 am
DENDenver International Airport
11/25/26
11:59 pm
DENDenver International Airport
3h 26m
11/26/26
5:25 am
PHLPhiladelphia International Airport
$235
Frontier AirlinesFrontier Airlinesfound Oct 14
11/18/26
8:20 pm
PHLPhiladelphia International Airport
21h 15mTPATampa International Airport
11/19/26
3:35 pm
DENDenver International Airport
11/25/26
11:59 pm
DENDenver International Airport
3h 26m
11/26/26
5:25 am
PHLPhiladelphia International Airport
$235
Southwest AirlinesSouthwest Airlinesfound Oct 11
11/02/26
7:25 pm
PHLPhiladelphia International Airport
5h 45mSTLSt Louis Lambert International Airport
11/02/26
11:10 pm
DENDenver International Airport
11/09/26
6:45 pm
DENDenver International Airport
3h 25m
11/10/26
12:10 am
PHLPhiladelphia International Airport
$317
Frontier AirlinesFrontier Airlinesfound Oct 14
11/18/26
10:37 am
PHLPhiladelphia International Airport
23h 36mMCOOrlando International Airport
11/19/26
8:13 am
DENDenver International Airport
11/25/26
11:59 pm
DENDenver International Airport
3h 26m
11/26/26
5:25 am
PHLPhiladelphia International Airport
$235
Southwest AirlinesSouthwest Airlinesfound Oct 11
11/02/26
8:15 pm
PHLPhiladelphia International Airport
6h 5mBNANashville International Airport
11/03/26
12:20 am
DENDenver International Airport
11/09/26
6:45 pm
DENDenver International Airport
3h 25m
11/10/26
12:10 am
PHLPhiladelphia International Airport
$317

Top Deals on flights from Philadelphia to Denver

Philadelphia, US (PHL) - Denver, US (DEN)

Sun Country AirlinesSun Country Airlines

Nov 1

2:50 pm
PHLPhiladelphia International Airport
5h 54m1 stop · MSP

Nov 1

6:44 pm
DENDenver International Airport
Search More

as low as

$173

Philadelphia, US (PHL) - Denver, US (DEN)

Sun Country AirlinesSun Country Airlines

Nov 1

8:15 am
PHLPhiladelphia International Airport
12h 29m1 stop · MSP

Nov 1

6:44 pm
DENDenver International Airport
Search More

as low as

$173

Philadelphia, US (PHL) - Denver, US (DEN)

Frontier AirlinesFrontier Airlines

Nov 1

12:10 pm
PHLPhiladelphia International Airport
22h 20m1 stop · DTW

Nov 2

8:30 am
DENDenver International Airport
Search More

as low as

$187

Philadelphia, US (PHL) - Denver, US (DEN)

Frontier AirlinesFrontier Airlines

Nov 1

6:00 am
PHLPhiladelphia International Airport
8h 8m1 stop · DFW

Nov 1

12:08 pm
DENDenver International Airport
Search More

as low as

$207

Philadelphia, US (PHL) - Denver, US (DEN)

Frontier AirlinesFrontier Airlines

Nov 1

12:36 pm
PHLPhiladelphia International Airport
9h 31m1 stop · ATL

Nov 1

8:07 pm
DENDenver International Airport
Search More

as low as

$207

Philadelphia, US (PHL) - Denver, US (DEN)

Frontier AirlinesFrontier Airlines

Nov 1

6:00 am
PHLPhiladelphia International Airport
11h 53m1 stop · DFW

Nov 1

3:53 pm
DENDenver International Airport
Search More

as low as

$213

Philadelphia, US (PHL) - Denver, US (DEN)

Frontier AirlinesFrontier Airlines

Nov 1

12:10 pm
PHLPhiladelphia International Airport
11h 54m1 stop · DTW

Nov 1

10:04 pm
DENDenver International Airport
Search More

as low as

$213

Philadelphia, US (PHL) - Denver, US (DEN)

Frontier AirlinesFrontier Airlines

Nov 1

9:09 pm
PHLPhiladelphia International Airport
13h 17m1 stop · ORD

Nov 2

8:26 am
DENDenver International Airport
Search More

as low as

$213

Philadelphia, US (PHL) - Denver, US (DEN)

Frontier AirlinesFrontier Airlines

Nov 1

8:30 am
PHLPhiladelphia International Airport
13h 37m1 stop · ATL

Nov 1

8:07 pm
DENDenver International Airport
Search More

as low as

$213

Philadelphia, US (PHL) - Denver, US (DEN)

Frontier AirlinesFrontier Airlines

Nov 1

8:01 pm
TTNTrenton Mercer Airport
14h 12m1 stop · MCO

Nov 2

8:13 am
DENDenver International Airport
Search More

as low as

$213

Philadelphia, US (PHL) - Denver, US (DEN)

Frontier AirlinesFrontier Airlines

Nov 1

8:01 pm
TTNTrenton Mercer Airport
21h 34m1 stop · MCO

Nov 2

3:35 pm
DENDenver International Airport
Search More

as low as

$213

Philadelphia, US (PHL) - Denver, US (DEN)

Frontier AirlinesFrontier Airlines

Nov 1

8:01 pm
TTNTrenton Mercer Airport
25h 59m1 stop · MCO

Nov 2

8:00 pm
DENDenver International Airport
Search More

as low as

$213

Best Denver Hotel + Flight Packages

Philadelphia - Denver packages

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When is the cheapest time to fly?

Cheapest in late January at about $231

Fares from Philadelphia to Denver are lowest in late January, around $231, and January is the cheapest month overall, averaging $234. They peak in late December at about $327, $96 more than the low. The yearly average is $270.

JanFebMarAprMayJunJulAugSepOctNovDec$0$60$120$180$240$300$360
Show the data
When is the cheapest time to fly?
MonthAverage fareEarly monthLate month
January$234$237$231
February$263$254$273
March$279$280$278
April$262$270$254
May$273$263$282
June$297$295$299
July$292$289$295
August$276$291$261
September$258$254$261
October$256$268$244
November$255$243$266
December$296$264$327

How far in advance should I book?

Cheapest about 5 weeks out at $226

Book about 5 weeks before departure for the best fares from Philadelphia to Denver, around $226. Booking in the final days before the flight costs about $310, $84 more. Booking six months ahead runs about $335.

1w2w1mo2mo3mo4mo5mo$0$40$80$120$160$200$240$280$320$360
Show the data
How far in advance should I book? (selected points, lowest and highest included)
Days before departureAverage fare
180 days$335
172 days$337
168 days$338
164 days$338
156 days$336
148 days$331
140 days$326
132 days$313
124 days$301
116 days$299
108 days$291
100 days$276
92 days$262
84 days$247
76 days$237
68 days$236
2mo$236
52 days$233
44 days$231
36 days$227
34 days$226
28 days$229
20 days$237
12 days$257
4 days$292
0 days$310

What's the cheapest day of the week to fly?

Tuesday is the cheapest day of the week to fly from Philadelphia to Denver. At $360 it is 5% cheaper than the average day. Sunday is the most expensive day, 13% above average.

$427Sun$400Mon$360Tue$363Wed$367Thu$366Fri$364Sat
Show the data
What's the cheapest day of the week to fly?
DayAverage fare
Sun$427
Mon$400
Tue$360
Wed$363
Thu$367
Fri$366
Sat$364

When is the best time of day to fly?

Late night (9pm - 12am) is the cheapest time of day to fly from Philadelphia to Denver. At $335 it is 8% cheaper than the average time. Morning (5am - 12pm) is the most expensive time, 8% above average.

$396Morning$353Midday$381Afternoon$361Evening$335Late Night
Show the data
When is the best time of day to fly?
Time of dayAverage fare
Morning$396
Midday$353
Afternoon$381
Evening$361
Late Night$335

What do round-trip flights from Philadelphia to Denver cost?

Share of fares in each price range, adjusted to current prices.

11%$100to $20027%$200to $30036%$300to $40014%$400to $5007%$500to $6004%$600to $7002%$700and up
Show the data
What do round-trip flights from Philadelphia to Denver cost?
Price rangeShare of fares
$100 to $20011%
$200 to $30027%
$300 to $40036%
$400 to $50014%
$500 to $6007%
$600 to $7004%
$700 and up2%
Methodology: learn how we calculate these charts

The charts “When is the cheapest time to fly?”, “How far in advance should I book?”, “What's the cheapest day of the week to fly?” and “What do round-trip flights from Philadelphia to Denver cost?” are built from the prices Priceline customers actually paid for flights on this route over the past 12 months or more.

Where a route has too few bookings to fill every point in a chart, we borrow the shape of the curve from a group of routes with similar price behavior and fit it to the fares booked on this route.

Because past fares don’t reflect today’s market, we then adjust the historical prices for current conditions such as inflation and fuel costs, using the round-trip fares found in recent searches on this route.

The chart “When is the best time of day to fly?” is calculated directly from the fares found in recent searches, not from historical bookings.

Frequently Asked Questions

Everything you need to know about flying from Philadelphia to Denver.

What is the typical flight duration from Philadelphia to Denver?

Philadelphia to Denver is about 1,550 miles, and the typical nonstop flight takes 4 hours 10 minutes. The return trip is quicker at 3 hours 36 minutes, a difference of 34 minutes driven by prevailing winds.
Methodology
Flight times and distances come from our flight-schedule database, which combines published airline timetables, U.S. government schedule data from the Bureau of Transportation Statistics (BTS), and observed flight operations from the EUROCONTROL/OpenSky Open Performance Data Initiative (OPDI). The typical flight time is the median scheduled block time across all carriers on the route, computed the same way in both directions so the difference reflects prevailing winds rather than any change in method. Distance is the great-circle distance between the two airports, so the actual flown track is typically 2-5% longer.

Are there any direct flights from Philadelphia to Denver?

Yes, there are direct non-stop flights from Philadelphia to Denver, with four airlines currently scheduled: American Airlines (26 weekly flights), United Airlines (21), Southwest Airlines (20), and Frontier Airlines (11). All four carriers fly the route daily, every day of the week. Departures are spread throughout the day from early morning through evening.
Methodology
Airlines and weekly frequencies are compiled from our flight-schedule database, which combines published airline timetables, U.S. government schedule data from the Bureau of Transportation Statistics (BTS), and observed flight operations from the EUROCONTROL/OpenSky Open Performance Data Initiative (OPDI). We count each operating carrier's scheduled weekly departures and the days it flies; where there is no nonstop service, connecting carriers are identified by linking scheduled nonstop segments through common hub airports. Where a median fare is shown for a carrier, it reflects the real fares Priceline users found on this route in the last 72 hours.

What are the ground transportation options in Denver?

Getting from Denver International Airport to the city center is straightforward: the RTD A Line commuter rail is the fastest and most-used option, reaching Union Station in about 37 minutes for $10.50, with trains running every 15 minutes around the clock. Ride-share services like Uber and Lyft take roughly 25–35 minutes and cost around $45, while taxis operate 24/7 with similar travel times. Shared-ride shuttles and hotel shuttles provide door-to-door service, and more than 10 major rental car companies serve the airport via free shuttle from the terminal. For budget travelers, the A Line or RTD SkyRide buses are the best value, while ride-share is the top choice for convenience and solo travelers.
References

When is the cheapest time to fly from Philadelphia to Denver?

Fares from Philadelphia to Denver are lowest in late January, around $231. January is the cheapest month overall, averaging $234, followed by November ($255) and October ($256). June is the most expensive month at about $297, and fares peak in late December at about $327. The yearly average is $270. Fares are adjusted to current market conditions.
Methodology
Seasonal fares come from Priceline's own air booking-summary archive, analysed in-house and refreshed monthly. For each day of the year we take a representative round-trip fare, a blend of the 25th-percentile and average ticket price over the route's bookings, and smooth the series into a seasonal curve; the half-month low and high and the monthly figures quoted here are averages of that curve. Thin and international routes borrow their seasonal shape from the nearest busy routes, with the price level anchored to the route's own bookings.

How far in advance should I book tickets from Philadelphia to Denver?

Book about 5 weeks before departure for the best fares from Philadelphia to Denver, around $226. Booking in the final days before the flight costs about $310, $84 more. Booking six months ahead runs about $335. Fares are adjusted to current market conditions.
Methodology
Booking-window guidance comes from the same monthly in-house analysis of Priceline's own air booking-summary archive. We aggregate the route's bookings by how many days before departure they were made, from about 180 days out to the day of travel, smooth the curve, and highlight the stretch of lead times with the lowest average fare. Thin and international routes borrow the curve shape from the nearest busy routes, anchored to the route's own price level. It reflects current fares and is refreshed monthly.

Are overnight (red‑eye) flights available from Philadelphia to Denver?

There are no nonstop red-eye flights from Philadelphia to Denver, but connecting overnight itineraries do operate. On Southwest via Nashville, the overnight leg departs at 10:25 PM and lands in Denver at 12:25 AM, in the early hours. On United via Washington Dulles, the overnight leg departs at 10:34 PM and lands at 12:30 AM, also in the early hours.
Methodology
Red-eye flights are identified from scheduled local departure and arrival times and block times in our flight-schedule database — built from published airline timetables and official schedule data, including U.S. Department of Transportation records for domestic routes. A flight counts as a red-eye when it departs in the afternoon or evening (3 p.m. or later local time) or in the early hours before 4 a.m., and is in the air at some point between midnight and 4 a.m. local time at both its departure airport and its arrival airport. An evening flight that lands before midnight at its destination is never counted, nor is a morning departure or a daytime long-haul that reaches the next calendar date only because of time zones. Each red-eye is labelled with its timing (for example, overnight and landing the next morning, or late-night and landing after midnight). For connecting itineraries the same rule is applied to the longer leg, from one representative day's flight search.

Which airlines usually operate this route from Philadelphia to Denver?

American Airlines, United Airlines, Southwest Airlines, and Frontier Airlines all fly non-stop from Philadelphia to Denver, with daily service on each carrier. American operates the most flights at 26 per week, followed by United at 21, Southwest at 20, and Frontier at 11. American is a member of the oneworld alliance and United belongs to Star Alliance, while Southwest and Frontier are not alliance members.
Methodology
Airlines and weekly frequencies come from our flight-schedule database, which combines published airline timetables, U.S. government schedule data from the Bureau of Transportation Statistics (BTS), and observed flight operations from the EUROCONTROL/OpenSky Open Performance Data Initiative (OPDI). We count each operating carrier's scheduled weekly departures and the days it flies; where there is no nonstop service, connecting carriers are identified by linking scheduled nonstop segments through common hub airports. Where a typical fare is shown for a carrier, it is the median of the real fares Priceline users found on this route in the last 72 hours.

How reliable are on‑time arrivals on this route from Philadelphia to Denver?

United Airlines is the most reliable carrier on the Philadelphia to Denver route, with 84.2% of flights arriving within 15 minutes of schedule and a cancellation rate of 0.9%. Southwest follows at 74.7% on-time, then American at 73.5% with a 2.2% cancellation rate, and Frontier at 72.1% on-time with a 0.8% cancellation rate.
Methodology
On-time arrival and cancellation rates come from the U.S. Bureau of Transportation Statistics (BTS) Airline On-Time Performance dataset, which covers U.S. domestic routes only; a flight counts as on time when it arrives within 15 minutes of schedule. Carriers are ranked by arrival on-time rate on this route, and the carrier list itself comes from our flight-schedule database, which combines published airline timetables, U.S. government schedule data from the Bureau of Transportation Statistics (BTS), and observed flight operations from the EUROCONTROL/OpenSky Open Performance Data Initiative (OPDI).

Which airport should I use in Denver?

Denver International Airport is the only commercial airport serving Denver. It is located about 25 miles northeast of downtown and is a major hub for United and Southwest, with extensive domestic connections and some international service.

How do I get to Philadelphia Intl Airport from the city center?

From Center City Philadelphia, the SEPTA Airport Regional Rail Line is the most popular and often fastest option, running every 30 minutes from stations like Jefferson, Suburban, and 30th Street directly to the airport terminals. Three SEPTA bus routes (37, 108, 115) also serve PHL from Zone 1, while rideshare pickups are at Zone 7 and taxis offer a flat rate to Center City. Shuttle services and private car transfers provide door-to-door convenience, and driving is straightforward with on-site garages and off-site lots offering shuttles.
References

Are there hotels or sleeping facilities at Denver airport?

The Westin Denver International Airport is connected to the Jeppesen Terminal at Denver International Airport, about a 5-minute walk from security. Numerous other nearby hotels offer free airport shuttles, though the airport has no sleep cabins, pods, or day rooms.
References

What facilities and services are available to travelers at Denver International Airport?

Denver International Airport has three World Wide Money Exchange locations for currency exchange, one each in Jeppesen Terminal (Level 5), Concourse A, and Concourse B. The airport offers dozens of shops selling high-quality clothing and memorable Colorado items, along with a variety of dining options. Travelers can explore an internationally recognized public art collection with Colorado-inspired rotating exhibitions. There are self-care services and lounges for relaxing, and a pedestrian bridge past security connecting Jeppesen Terminal to Concourse A spans an active taxiway for plane watching. Golf DEN in Concourse A provides an interactive play space open from 7 a.m. to 7 p.m.
References

Are there accessible services or children's facilities at the Philadelphia and Denver airports?

At Philadelphia International Airport, mobility assistance is arranged through your airline when booking, with support from ticketing through security, the gate, and boarding, plus airport-provided wheelchairs; the airport also offers a children's play area, lactation suites, a Hidden Disabilities Sunflower Program, and Aira video interpreting apps. At Denver International Airport, travelers can obtain a Sunflower Lanyard from a customer service agent at any of the four information booths, use Aira for wayfinding, and access interpreter services, TTY telephones, and video relay service. To arrange mobility assistance, contact your airline in advance or visit the airline's wheelchair service station in the ticketing lobby on the day of travel.
References

What aircraft are typically used on flights from Philadelphia to Denver?

American Airlines operates the most flights on the Philadelphia to Denver route, using Boeing 737 family aircraft including the 737-800, plus Airbus A320 family aircraft including the A321. United Airlines flies Boeing 737 family aircraft including the 737-800, while Southwest Airlines uses Boeing 737-700s as well as Boeing 737 family aircraft. Frontier Airlines rounds out the nonstop service with Airbus A320 family aircraft.
Methodology
Aircraft types come from our flight-schedule database, which combines published airline timetables, U.S. government schedule data from the Bureau of Transportation Statistics (BTS), and observed flight operations from the EUROCONTROL/OpenSky Open Performance Data Initiative (OPDI). For U.S. routes the type is grounded in the tail number that actually operated the flight; elsewhere it comes from the airline's filed equipment code. Where the source does not commit to a specific variant we name the aircraft family (for example Airbus A320 family) rather than guess, and where no reliable type is on file the aircraft is omitted rather than estimated. Types describe typical scheduled equipment and can vary with seasonal or day-of-week assignments and last-minute swaps.

Which airline alliances serve flights from Philadelphia to Denver?

Nonstop service between Philadelphia and Denver is currently flown by American Airlines (oneworld), United Airlines (Star Alliance), Southwest Airlines, and Frontier Airlines. Southwest and Frontier are not alliance members, so American's oneworld and United's Star Alliance are the alliances represented on this route, though other alliances can reach it via connections.
Methodology
Airlines and weekly frequencies are compiled from our flight-schedule database, which combines published airline timetables, U.S. government schedule data from the Bureau of Transportation Statistics (BTS), and observed flight operations from the EUROCONTROL/OpenSky Open Performance Data Initiative (OPDI). We count each operating carrier's scheduled weekly departures and the days it flies; where there is no nonstop service, connecting carriers are identified by linking scheduled nonstop segments through common hub airports. Where a median fare is shown for a carrier, it reflects the real fares Priceline users found on this route in the last 72 hours.

What are the best airport lounge options when departing from Philadelphia?

Philadelphia International Airport offers several lounge options when departing, including three American Airlines Admirals Clubs in Terminal A-West, the B/C connector, and Terminal F, plus a Flagship Lounge in Terminal A-West for premium travelers. There is also an American Express Centurion Lounge near gate A14, a British Airways Galleries Club Lounge in Terminal A-West, a Delta Sky Club in the D/E connector, and a United Club in the C/D connector. The Chase Sapphire Lounge by The Club in the D/E connector features local food and beverages, a wellness area with facial treatments and rest pods, a beer garden, private phone rooms, showers, and runway views. Minute Suites in the A/B link offers 24-hour private rest spaces and accepts Priority Pass.
References

Are same‑day changes or standby possible on this route?

Same-day changes and standby on this route depend on the airline and fare class; flexible tickets and premium cabins generally allow them, while Basic Economy does not.