
Round-trip flight from Seattle
SEA to STL
Crowne Plaza Hotel St. Louis Airport By IHG
Incl. Flight + Hotel




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Essential information to help you plan your flight from Seattle to St. Louis.
Cheapest price found on Priceline for this route in the last 16 days. Found 4 days ago.
$117 below the typical $313 round-trip on this route.
Lowest one-way price found on Priceline for this route in the last 16 days. Found 18 days ago.
The typical one-way fare on this route is $215.
Cheapest nonstop found on Priceline for this route in the last 16 days. Found 9 days ago.
Saves 12h 17m of travel time, but costs $169 more than the cheapest fare.
A round-trip at or under $246 is a good deal on this route right now.
75% of the fares we found on this route cost more; only a quarter cost less.
The best day, time of day, season and booking window for this route.
Tuesday departures average $325 on this route, the lowest of any weekday.
$28 less than the average weekday, which is $353.
Late Night departures average $257 on this route, the lowest of any time of day.
$97 less than the average departure, which is $354.
Fares average $222 in January, the cheapest month to fly this route, bottoming out near $220 in late January.
$40 below the yearly average of $262.
Fares on this route are lowest when booked about 5 weeks before departure.
Booking then averages $196, versus $252 in the final days before the flight.
Priceline is always monitoring flight prices on this route. When we spot an offer on a specific flight that’s significantly lower than what that flight usually sells for, we call it out here as a price drop.
SEASTL
37% Price Drop
Southwest Airlines
Depart Dec 8 · Return Dec 12
4-night trip · economy
SEASTL
35% Price Drop
Delta Air Lines
Depart Nov 18 · Return Nov 22
4-night trip · economy
SEASTL
33% Price Drop
Delta Air Lines
Depart Nov 17 · Return Nov 22
5-night trip · economy
SEASTL
33% Price Drop
Alaska Airlines
Depart Nov 12 · Return Nov 15
3-night trip · economy
SEASTL
30% Price Drop
American Airlines
Depart Oct 22 · Return Oct 26
4-night trip · economy
SEASTL
29% Price Drop
Southwest Airlines
Depart Dec 4 · Return Dec 7
3-night trip · economy
Southwest Airlinesfound Oct 15
American Airlinesfound Oct 15
Southwest Airlinesfound Oct 15
American Airlinesfound Oct 15Book a flight & hotel together for extra savings.
On average save $240 per traveler
Southwest Airlinesfound Oct 15
American Airlinesfound Oct 15
Southwest Airlinesfound Oct 15
American Airlinesfound Oct 15
Southwest Airlinesfound Oct 15
American Airlinesfound Oct 15Seattle, US (SEA) - St. Louis, US (STL)
Frontier AirlinesOct 22
Oct 23
as low as
$163Seattle, US (SEA) - St. Louis, US (STL)
Frontier AirlinesOct 22
Oct 23
as low as
$195Seattle, US (SEA) - St. Louis, US (STL)
Southwest AirlinesNov 18
Nov 18
as low as
$196Seattle, US (SEA) - St. Louis, US (STL)
Southwest AirlinesNov 18
Nov 18
as low as
$196Seattle, US (SEA) - St. Louis, US (STL)
Southwest AirlinesNov 18
Nov 18
as low as
$196Seattle, US (SEA) - St. Louis, US (STL)
Southwest AirlinesNov 18
Nov 18
as low as
$196Seattle, US (SEA) - St. Louis, US (STL)
Southwest AirlinesNov 18
Nov 18
as low as
$196Seattle, US (SEA) - St. Louis, US (STL)
Southwest AirlinesNov 18
Nov 18
as low as
$196Seattle, US (SEA) - St. Louis, US (STL)
Southwest AirlinesNov 18
Nov 18
as low as
$196Seattle, US (SEA) - St. Louis, US (STL)
Southwest AirlinesNov 18
Nov 18
as low as
$196Seattle, US (SEA) - St. Louis, US (STL)
Southwest AirlinesNov 18
Nov 18
as low as
$196Seattle, US (SEA) - St. Louis, US (STL)
Southwest AirlinesNov 18
Nov 18
as low as
$196Seattle - St. Louis packages

Round-trip flight from Seattle
SEA to STL
Crowne Plaza Hotel St. Louis Airport By IHG
Incl. Flight + Hotel

Round-trip flight from Seattle
SEA to STL
Hyatt Regency St Louis at The Arch
Incl. Flight + Hotel

Round-trip flight from Seattle
SEA to STL
Pear Tree Inn St. Louis Union Station
Incl. Flight + Hotel

Round-trip flight from Seattle
SEA to STL
Quality Inn Saint Louis Airport
Incl. Flight + Hotel

Round-trip flight from Seattle
SEA to STL
Hilton St. Louis At The Ballpark
Incl. Flight + Hotel

Round-trip flight from Seattle
SEA to STL
Renaissance St. Louis Airport Hotel
Incl. Flight + Hotel

Round-trip flight from Seattle
SEA to STL
Best Western St. Louis-Kirkwood Route 66
Incl. Flight + Hotel

Round-trip flight from Seattle
SEA to STL
Marriott St. Louis Grand
Incl. Flight + Hotel
Seattle - St. Louis packages

Round-trip flight from Seattle
SEA to STL
Quality Inn Saint Louis Airport
Rental car included
Pick-up in STL
Incl. Flight + Hotel + Car

Round-trip flight from Seattle
SEA to STL
Renaissance St. Louis Airport Hotel
Rental car included
Pick-up in STL
Incl. Flight + Hotel + Car

Round-trip flight from Seattle
SEA to STL
Hilton St. Louis At The Ballpark
Rental car included
Pick-up in STL
Incl. Flight + Hotel + Car

Round-trip flight from Seattle
SEA to STL
Marriott St. Louis Grand
Rental car included
Pick-up in STL
Incl. Flight + Hotel + Car

Round-trip flight from Seattle
SEA to STL
Best Western St. Louis-Kirkwood Route 66
Rental car included
Pick-up in STL
Incl. Flight + Hotel + Car

Round-trip flight from Seattle
SEA to STL
Crowne Plaza Hotel St. Louis Airport By IHG
Rental car included
Pick-up in STL
Incl. Flight + Hotel + Car

Round-trip flight from Seattle
SEA to STL
Pear Tree Inn St. Louis Union Station
Rental car included
Pick-up in STL
Incl. Flight + Hotel + Car

Round-trip flight from Seattle
SEA to STL
Hyatt Regency St Louis at The Arch
Rental car included
Pick-up in STL
Incl. Flight + Hotel + Car
Cheapest in late January at about $220
Fares from Seattle to St. Louis are lowest in late January, around $220, and January is the cheapest month overall, averaging $222. They peak in late December at about $305, $85 more than the low. The yearly average is $262.
| Month | Average fare | Early month | Late month |
|---|---|---|---|
| January | $222 | $224 | $220 |
| February | $235 | $231 | $240 |
| March | $261 | $253 | $268 |
| April | $265 | $271 | $258 |
| May | $270 | $263 | $277 |
| June | $284 | $271 | $297 |
| July | $301 | $304 | $298 |
| August | $275 | $289 | $262 |
| September | $247 | $248 | $246 |
| October | $246 | $252 | $240 |
| November | $251 | $237 | $265 |
| December | $288 | $270 | $305 |
Cheapest about 5 weeks out at $196
Book about 5 weeks before departure for the best fares from Seattle to St. Louis, around $196. Booking in the final days before the flight costs about $252, $56 more. Booking six months ahead runs about $275.
| Days before departure | Average fare |
|---|---|
| 180 days | $275 |
| 172 days | $272 |
| 164 days | $272 |
| 156 days | $274 |
| 148 days | $272 |
| 140 days | $264 |
| 132 days | $259 |
| 124 days | $252 |
| 116 days | $239 |
| 108 days | $227 |
| 100 days | $220 |
| 92 days | $216 |
| 84 days | $212 |
| 76 days | $211 |
| 68 days | $209 |
| 2mo | $204 |
| 52 days | $201 |
| 44 days | $199 |
| 36 days | $198 |
| 32 days | $196 |
| 28 days | $198 |
| 20 days | $211 |
| 12 days | $231 |
| 4 days | $247 |
| 0 days | $252 |
Tuesday is the cheapest day of the week to fly from Seattle to St. Louis. At $325 it is 8% cheaper than the average day. Sunday is the most expensive day, 9% above average.
| Day | Average fare |
|---|---|
| Sun | $383 |
| Mon | $365 |
| Tue | $325 |
| Wed | $336 |
| Thu | $353 |
| Fri | $352 |
| Sat | $356 |
Late night (9pm - 12am) is the cheapest time of day to fly from Seattle to St. Louis. At $257 it is 27% cheaper than the average time. Evening (5pm - 9pm) is the most expensive time, 44% above average.
| Time of day | Average fare |
|---|---|
| Early Morning | $378 |
| Morning | $351 |
| Midday | $326 |
| Afternoon | $304 |
| Evening | $509 |
| Late Night | $257 |
Share of fares in each price range, adjusted to current prices.
| Price range | Share of fares |
|---|---|
| $100 to $200 | 6% |
| $200 to $300 | 42% |
| $300 to $400 | 22% |
| $400 to $500 | 13% |
| $500 to $600 | 8% |
| $600 to $700 | 6% |
| $700 and up | 2% |
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 Seattle to St. Louis 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.