Puerto Rico — flights from St. Louis to Puerto Rico

Flight Deals from St. Louis to Puerto Rico from $104

Q: When is the cheapest time to fly from St. Louis to Puerto Rico?

The cheapest months to fly from St. Louis to San Juan, Puerto Rico are September, January, and February, with September running 9% below the yearly average and January 8% below. The lowest fares of the year come in late January. The priciest months are December and June, each running 12% above the yearly average, with late December the single most expensive period.

Q: How far in advance should I book flights from St. Louis to Puerto Rico?

For flights from St. Louis to San Juan, Puerto Rico, the best booking window is 30 to 50 days before departure, with the lowest fares typically about 5 weeks out. Fares rise when booking very early, around 170 days ahead, or very late, closer to departure, compared to that optimal window.

Q: What are the most popular cities to visit in Puerto Rico?

In Puerto Rico, San Juan is the main gateway with historic Old San Juan and beaches. Ponce offers colonial architecture and museums. Rincón and Aguadilla draw surfers and beachgoers on the west coast. Fajardo and Vieques are popular for bioluminescent bays and island hopping, including short flights or ferries.

Q: When is the best time of year to visit Puerto Rico?

For Puerto Rico, mid-December through April offers the most reliable dry weather and is the busiest and priciest stretch. May and June bring lower fares and fewer crowds before the summer family travel peak, while September and October are the rainiest months and the least expensive time to fly from St. Louis.

Q: How do I get to Lambert Intl Airport from the city center?

From downtown St. Louis, the MetroLink light rail offers a direct, affordable ride into Lambert International Airport, with trains running roughly every 10 minutes during the day. Ride-share services like Uber and Lyft, as well as taxis, provide curbside pickup at the terminals and are the fastest door-to-door option, typically taking about 15 to 20 minutes from the city center. Driving yourself is also straightforward via I-70, with short-term and long-term parking available in attached garages and surface lots at both terminals. Most travelers heading to the airport from downtown favor ride-share or taxis for convenience, while MetroLink remains the most budget-friendly choice.

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Good to Know

Cheapest fares and when to fly, by destination city — select a row for the details.

Cheapest RT	Cheapest OW	Good Deal Price	Best Time to Fly	Best Day to Fly	When to Book
$306	$104	$383	Afternoon	Tuesday	6 weeks
Cheapest round-trip found on Priceline in the last 8 days. $97 below the typical $403 round-trip on this route. Lowest one-way found in the last 8 days. The typical one-way fare is $245. A round-trip at or under $383 is a good deal on this route right now. 75% of the fares we found cost more; only a quarter cost less. Tuesday departures average $378 on this route, the lowest of any weekday. $28 less than the average weekday, which is $406. Afternoon departures average $384 on this route, the lowest of any time of day. $27 less than the average departure, which is $411. Fares on this route are lowest when booked about 6 weeks before departure. See all flights to San Juan →
$296	$147	$691	Afternoon	Tuesday	6 weeks
Cheapest round-trip found on Priceline in the last 8 days. $529 below the typical $825 round-trip on this route. Lowest one-way found in the last 8 days. The typical one-way fare is $600. A round-trip at or under $691 is a good deal on this route right now. 75% of the fares we found cost more; only a quarter cost less. Tuesday departures average $807 for flights to this destination, the lowest of any weekday. $59 less than the average weekday, which is $866. Afternoon departures average $342 on this route, the lowest of any time of day. $375 less than the average departure, which is $717. Fares to this destination are lowest when booked about 6 weeks before departure. See all flights to Aguadilla →
—	$206	—	—	Tuesday	6 weeks
Lowest one-way found in the last 8 days. Tuesday departures average $192 for flights to this destination, the lowest of any weekday. $14 less than the average weekday, which is $206. Fares to this destination are lowest when booked about 6 weeks before departure. See all flights to Ponce →
$595	$309	$677	Evening	Tuesday	6 weeks
Cheapest round-trip found on Priceline in the last 8 days. $141 below the typical $736 round-trip on this route. Lowest one-way found in the last 8 days. The typical one-way fare is $526. A round-trip at or under $677 is a good deal on this route right now. 75% of the fares we found cost more; only a quarter cost less. Tuesday departures average $707 for flights to this destination, the lowest of any weekday. $52 less than the average weekday, which is $759. Evening departures average $735 on this route, the lowest of any time of day. $24 less than the average departure, which is $759. Fares to this destination are lowest when booked about 6 weeks before departure. See all flights to Mayagueez →
$700	$343	$761	Midday	Tuesday	6 weeks
Cheapest round-trip found on Priceline in the last 8 days. $152 below the typical $852 round-trip on this route. Lowest one-way found in the last 8 days. The typical one-way fare is $477. A round-trip at or under $761 is a good deal on this route right now. 75% of the fares we found cost more; only a quarter cost less. Tuesday departures average $792 for flights to this destination, the lowest of any weekday. $58 less than the average weekday, which is $850. Midday departures average $820 on this route, the lowest of any time of day. $30 less than the average departure, which is $850. Fares to this destination are lowest when booked about 6 weeks before departure. See all flights to Culebra →

Methodology: learn how we calculate these figures

The best day to fly and how far ahead to book shown in this table are built from the prices Priceline customers actually paid for flights to this destination over the past 12 months or more.

Where a route has too few bookings to fill a figure, we borrow the shape from a group of routes with similar price behavior and fit it to the fares booked on that 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.

The cheapest round-trip and one-way fares, the good-deal price and the best time of day to fly come directly from the fares found in recent searches, not from historical bookings.

Best Puerto Rico Hotel + Flight Packages

Round-trip flight from St. Louis

STL to SJU

Hotel Rumbao, a Tribute Portfolio Hotel

San Juan, 100 Brumbaugh Street

8.2799 Reviews4-Star Hotel

31% Package Savings

^$1,127/person

$3,283 $2,253 total

Incl. Flight + Hotel

Aguadilla Breeze apt in gated complex 8 minute walk to Crashboat beach

Round-trip flight from St. Louis

STL to BQN

Aguadilla Breeze apt in gated complex 8 minute walk to Crashboat beach

Aguadilla, Calle Bonaire, Barrio Borinquen

8.737 Reviews0-Star Hotel

^$730/person

$1,460 total

Incl. Flight + Hotel

2.3 Balcony • Loft • Near City Plaza • 2nd Floor

Round-trip flight from St. Louis

STL to MAZ

2.3 Balcony • Loft • Near City Plaza • 2nd Floor

Mayaguez, Apt 2.3 8 Calle Santiago Riera Palmer

101 Reviews0-Star Hotel

^$652/person

$1,304 total

Incl. Flight + Hotel

Round-trip flight from St. Louis

STL to CPX

Always Summer Inn Bay Front

Culebra, Calle 5 La Romana

8.510 Reviews0-Star Hotel

^$956/person

$1,912 total

Incl. Flight + Hotel

Holiday Inn Express San Juan Condado By IHG

Round-trip flight from St. Louis

STL to SJU

Holiday Inn Express San Juan Condado By IHG

San Juan, 1 Calle Mariano Ramirez Bages

7.9585 Reviews3.5-Star Hotel

13% Package Savings

^$1,129/person

$2,587 $2,257 total

Incl. Flight + Hotel

Round-trip flight from St. Louis

STL to BQN

Pasavento - Modern Tiny Suite

Aguadilla, Avenida Severiano Cuevas Pasavento Modern Suites Ii

9.239 Reviews0-Star Hotel

^$731/person

$1,461 total

Incl. Flight + Hotel

1.3• Generator • 1st Floor • Parking • 1BR • 230sf

Round-trip flight from St. Louis

STL to MAZ

1.3• Generator • 1st Floor • Parking • 1BR • 230sf

Mayaguez, Apt 1.3 172 Calle Santiago Riera Palmer

101 Reviews0-Star Hotel

^$662/person

$1,323 total

Incl. Flight + Hotel

Round-trip flight from St. Louis

STL to CPX

Casa Robinson Guest House

Culebra, H-10 Bo. La Romana Po Box 244

8.386 Reviews3-Star Hotel

^$969/person

$1,938 total

Incl. Flight + Hotel

Best Puerto Rico Hotel + Flight + Car Packages

Round-trip flight from St. Louis

STL to SJU

Holiday Inn Express San Juan Condado By IHG

San Juan, 1 Calle Mariano Ramirez Bages

7.9585 Reviews3.5-Star Hotel

Rental car included

Pick-up in SJU

12% Package Savings

^$1,218/person

$2,778 $2,436 total

Incl. Flight + Hotel + Car

Round-trip flight from St. Louis

STL to CPX

Always Summer Inn Bay Front

Culebra, Calle 5 La Romana

8.510 Reviews0-Star Hotel

Rental car included

Pick-up in CPX

1% Package Savings

^$1,088/person

$2,206 $2,176 total

Incl. Flight + Hotel + Car

Round-trip flight from St. Louis

STL to BQN

Pasavento - Modern Tiny Suite

Aguadilla, Avenida Severiano Cuevas Pasavento Modern Suites Ii

9.239 Reviews0-Star Hotel

Rental car included

Pick-up in BQN

^$775/person

$1,549 total

Incl. Flight + Hotel + Car

Round-trip flight from St. Louis

STL to MAZ

1.3• Generator • 1st Floor • Parking • 1BR • 230sf

Mayaguez, Apt 1.3 172 Calle Santiago Riera Palmer

101 Reviews0-Star Hotel

Rental car included

Pick-up in MAZ

^$705/person

$1,410 total

Incl. Flight + Hotel + Car

Round-trip flight from St. Louis

STL to CPX

Casa Robinson Guest House

Culebra, H-10 Bo. La Romana Po Box 244

8.386 Reviews3-Star Hotel

Rental car included

Pick-up in CPX

1% Package Savings

^$1,101/person

$2,232 $2,202 total

Incl. Flight + Hotel + Car

Round-trip flight from St. Louis

STL to BQN

Aguadilla Breeze apt in gated complex 8 minute walk to Crashboat beach

Aguadilla, Calle Bonaire, Barrio Borinquen

8.737 Reviews0-Star Hotel

Rental car included

Pick-up in BQN

^$774/person

$1,548 total

Incl. Flight + Hotel + Car

Round-trip flight from St. Louis

STL to MAZ

2.3 Balcony • Loft • Near City Plaza • 2nd Floor

Mayaguez, Apt 2.3 8 Calle Santiago Riera Palmer

101 Reviews0-Star Hotel

Rental car included

Pick-up in MAZ

^$696/person

$1,391 total

Incl. Flight + Hotel + Car

Round-trip flight from St. Louis

STL to SJU

Hotel Rumbao, a Tribute Portfolio Hotel

San Juan, 100 Brumbaugh Street

8.2799 Reviews4-Star Hotel

Rental car included

Pick-up in SJU

30% Package Savings

^$1,220/person

$3,473 $2,439 total

Incl. Flight + Hotel + Car

When is the cheapest time to fly?

Cheapest in late January at about $422

Fares from St. Louis to Puerto Rico are lowest in late January, around $422, and February is the cheapest month overall, averaging $444. They peak in late December at about $600, $178 more than the low. The yearly average is $497.

Show the data

When is the cheapest time to fly?
Month	Average fare	Early month	Late month
January	$449	$478	$422
February	$444	$451	$437
March	$492	$470	$512
April	$466	$476	$455
May	$488	$469	$507
June	$585	$574	$597
July	$584	$571	$596
August	$491	$515	$469
September	$452	$448	$455
October	$463	$449	$476
November	$495	$485	$505
December	$550	$497	$600

How far in advance should I book?

Cheapest about 6 weeks out at $463

Book about 6 weeks before departure for the best fares from St. Louis to Puerto Rico, around $463. Booking in the final days before the flight costs about $638, $175 more. Booking six months ahead runs about $806.

Show the data

How far in advance should I book? (selected points, lowest and highest included)
Days before departure	Average fare
180 days	$806
172 days	$868
165 days	$896
164 days	$896
156 days	$865
148 days	$769
140 days	$667
132 days	$658
124 days	$713
116 days	$713
108 days	$630
100 days	$567
92 days	$531
84 days	$516
76 days	$546
68 days	$574
2mo	$540
52 days	$481
45 days	$463
44 days	$463
36 days	$466
28 days	$473
20 days	$519
12 days	$577
4 days	$620
0 days	$638

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

Tuesday is the cheapest day of the week to fly from St. Louis to Puerto Rico. At $662 it is 7% cheaper than the average day. Sunday is the most expensive day, 4% above average.

Show the data

What's the cheapest day of the week to fly?
Day	Average fare
Sun	$746
Mon	$729
Tue	$662
Wed	$680
Thu	$734
Fri	$732
Sat	$714

When is the best time of day to fly?

Afternoon (2pm - 5pm) is the cheapest time of day to fly from St. Louis to Puerto Rico. At $383 it is 38% cheaper than the average time. Evening (5pm - 9pm) is the most expensive time, 39% above average.

Show the data

When is the best time of day to fly?
Time of day	Average fare
Morning	$712
Midday	$727
Afternoon	$383
Evening	$860
Late Night	$410

What do round-trip flights from St. Louis to Puerto Rico cost?

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

Show the data

What do round-trip flights from St. Louis to Puerto Rico cost?
Price range	Share of fares
$200 to $400	20%
$400 to $600	23%
$600 to $800	29%
$800 to $1,000	19%
$1,000 to $1,200	6%
$1,200 to $1,400	2%
$1,400 and up	<1%

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 St. Louis to Puerto Rico 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 St. Louis to Puerto Rico.

When is the cheapest time to fly from St. Louis to Puerto Rico?

The cheapest months to fly from St. Louis to San Juan, Puerto Rico are September, January, and February, with September running 9% below the yearly average and January 8% below. The lowest fares of the year come in late January. The priciest months are December and June, each running 12% above the yearly average, with late December the single most expensive period.

Methodology

These seasonal fares look at the busiest city-to-city routes between the two places (up to four, chosen by scheduled flights) and at the seasonal fare curve Priceline's own archive provides for each route. Months are ranked by how far each month's average fare sits above or below that route's yearly average, taking the middle value across the routes, so one expensive route cannot dominate.

How far in advance should I book flights from St. Louis to Puerto Rico?

For flights from St. Louis to San Juan, Puerto Rico, the best booking window is 30 to 50 days before departure, with the lowest fares typically about 5 weeks out. Fares rise when booking very early, around 170 days ahead, or very late, closer to departure, compared to that optimal window.

Methodology

This booking-window guidance looks at the busiest city-to-city routes between the two places (up to four, chosen by scheduled flights) and at the booking-window fare curve Priceline's own archive provides for each route. The best time to book is the middle value of those routes' cheapest lead times.

What are the most popular cities to visit in Puerto Rico?

In Puerto Rico, San Juan is the main gateway with historic Old San Juan and beaches. Ponce offers colonial architecture and museums. Rincón and Aguadilla draw surfers and beachgoers on the west coast. Fajardo and Vieques are popular for bioluminescent bays and island hopping, including short flights or ferries.

When is the best time of year to visit Puerto Rico?

For Puerto Rico, mid-December through April offers the most reliable dry weather and is the busiest and priciest stretch. May and June bring lower fares and fewer crowds before the summer family travel peak, while September and October are the rainiest months and the least expensive time to fly from St. Louis.

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

From downtown St. Louis, the MetroLink light rail offers a direct, affordable ride into Lambert International Airport, with trains running roughly every 10 minutes during the day. Ride-share services like Uber and Lyft, as well as taxis, provide curbside pickup at the terminals and are the fastest door-to-door option, typically taking about 15 to 20 minutes from the city center. Driving yourself is also straightforward via I-70, with short-term and long-term parking available in attached garages and surface lots at both terminals. Most travelers heading to the airport from downtown favor ride-share or taxis for convenience, while MetroLink remains the most budget-friendly choice.

References

Parking & Transportation - St. Louis Lambert International Airportflystl.com · Published Aug 17, 2026
St. Louis Transportation | Soul Of America | St. Louissoulofamerica.com · Published Aug 12, 2025
St Louis Public Transportation and Airport Optionsexplorestlouis.com
A Guide to St. Louis Lambert International Airport (STL) | Chasechase.com · Published Sep 10, 2025
How to get from St Louis Airport (STL) to Saint Louis, MO | Uberuber.com · Published Oct 2, 2026
St Louis Airport Transfers: Pickup & Shuttleuber.com
Find cheap flights to Saint Louis (STL) | American Airlinesaa.com · Published Aug 17, 2026

Flight Deals from St. Louis to Puerto Rico from $104

Good to Know

Best Puerto Rico Hotel + Flight Packages

Best Puerto Rico Hotel + Flight + Car Packages

When is the cheapest time to fly?

How far in advance should I book?

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

When is the best time of day to fly?

What do round-trip flights from St. Louis to Puerto Rico cost?

Frequently Asked Questions

When is the cheapest time to fly from St. Louis to Puerto Rico?

How far in advance should I book flights from St. Louis to Puerto Rico?

What are the most popular cities to visit in Puerto Rico?

When is the best time of year to visit Puerto Rico?

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

Flights to Puerto Rico