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St. Louis

$87+ Cheap flights from San Juan to St. Louis (STL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/25. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — STL
Feb 20 — Feb 271
Fri 2/20
Fri 2/27
1 adult, Economy
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Cheap flight deals from San Juan to St. Louis

Cheapest flights from San Juan to St. Louis
Explore the most affordable flight options available from San Juan to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 21, 2026.

This Priceline deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/34:36 pm
SJU
-
STL
1 stop8h 57m
Frontier
Thu 2/55:42 pm
STL
-
SJU
1 stop14h 42m
Frontier
Deal found 1/20$182
This Kiwi.com deal was found by Cheapflights users on 1/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/55:50 pm
SJU
-
STL
2 stops39h 01m
Multiple Airlines
Mon 2/95:42 pm
STL
-
SJU
1 stop14h 05m
Multiple Airlines
Deal found 1/21$208
This Frontier deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/55:25 pm
SJU
-
STL
1 stop8h 34m
Frontier
Mon 3/94:51 pm
STL
-
SJU
1 stop8h 07m
Frontier
Deal found 1/19$220
This Delta deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/162:34 pm
SJU
-
STL
1 stop9h 59m
Delta
Sun 4/199:40 am
STL
-
SJU
1 stop9h 26m
Delta
Deal found 1/20$246
This Priceline deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/264:36 pm
SJU
-
STL
1 stop8h 57m
Frontier
Sat 1/3112:12 pm
STL
-
SJU
1 stop9h 47m
Frontier
Deal found 1/20$264
This Expedia deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/266:30 am
SJU
-
STL
1 stop25h 32m
Frontier
Tue 3/314:51 pm
STL
-
SJU
1 stop8h 12m
Frontier
Deal found 1/20$271
This Travelocity deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/253:08 am
SJU
-
STL
1 stop28h 54m
Frontier
Mon 3/307:47 am
STL
-
SJU
1 stop25h 10m
Frontier
Deal found 1/20$273
This Kiwi.com deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/34:40 pm
SJU
-
STL
2 stops16h 11m
Multiple Airlines
Thu 2/55:42 pm
STL
-
SJU
1 stop14h 05m
Multiple Airlines
Deal found 1/20$280
This American Airlines deal was found by Cheapflights users on 1/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/143:07 pm
SJU
-
STL
1 stop9h 41m
American Airlines
Tue 5/196:27 am
STL
-
SJU
1 stop14h 38m
American Airlines
Deal found 1/21$286
This Frontier deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/1312:27 pm
SJU
-
STL
1 stop14h 00m
Frontier
Fri 2/203:49 pm
STL
-
SJU
1 stop6h 54m
Frontier
Deal found 1/20$316
This Kiwi.com deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/29:11 pm
SJU
-
STL
2 stops35h 40m
Multiple Airlines
Sun 3/84:51 pm
STL
-
SJU
1 stop15h 26m
Multiple Airlines
Deal found 1/20$319

Find flight deals from San Juan to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from San Juan (PR1) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 21, 2026.

Round-trip from

$182
(Priceline)

One-way from

$87
(Priceline)

Popular in

June

Cheapest in

January

Average price

$248
From San Juan to Lambert-St Louis
Search Deals
One-way flight from San Juan to Lambert-St Louis
Search Deals
Highest demand for flights based on searches. 21% potential increase in price ($110 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Juan to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 21, 2026.
Use the filters below to find and compare flights from San Juan to St. Louis that are best for you.

Fly from

San Juan

Fly to

St. Louis

Route

Depart

Return

Price

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Thu 2/5

4:36 pm-11:33 pm

1 stop8h 57m

Lambert-St Louis

Mon 2/9

10:16 am-6:40 pm

1 stop6h 24m

$182

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Thu 3/5

5:25 pm-11:59 pm

1 stop8h 34m

Lambert-St Louis

Mon 3/9

4:51 pm-1:58 am

1 stop8h 07m

$220

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Thu 4/16

2:34 pm-11:33 pm

1 stop9h 59m

Lambert-St Louis

Sun 4/19

9:40 am-8:06 pm

1 stop9h 26m

$246

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Mon 1/26

4:36 pm-11:33 pm

1 stop8h 57m

Lambert-St Louis

Sat 1/31

12:12 pm-11:59 pm

1 stop9h 47m

$264

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Thu 3/26

6:30 am-7:02 am

1 stop25h 32m

Lambert-St Louis

Tue 3/31

4:51 pm-2:03 am

1 stop8h 12m

$271

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Wed 3/25

3:08 am-7:02 am

1 stop28h 54m

Lambert-St Louis

Mon 3/30

7:47 am-9:57 am

1 stop25h 10m

$273

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Fri 2/13

12:27 pm-12:27 am

1 stop14h 00m

Lambert-St Louis

Fri 2/20

3:49 pm-12:43 am

1 stop6h 54m

$316

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Mon 3/2

9:11 pm-6:51 am

2 stops35h 40m

Lambert-St Louis

Sun 3/8

4:51 pm-9:17 am

1 stop15h 26m

$319

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Mon 3/30

2:44 pm-11:58 pm

1 stop10h 14m

Lambert-St Louis

Thu 4/2

4:21 pm-11:12 pm

1 stop5h 51m

$346

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Mon 3/2

7:01 pm-10:32 am

1 stop17h 31m

Lambert-St Louis

Sun 3/8

6:13 am-11:52 pm

1 stop16h 39m

$359

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/20

Showing 1-10 of 19 results
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Best time to book a flight from San Juan to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from San Juan with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from San Juan to St. Louis

How far ahead should I book a flight from San Juan to St. Louis?

Use this chart to determine the optimal time to book a round-trip flight from San Juan to St. Louis. Price data was last updated on January 16, 2026.

Booking 58 days in advance of your planned departure date is, on average, the best time to get cheap flights from San Juan to St. Louis. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from San Juan to St. Louis?

Currently, June is the cheapest month in which you can book a flight from San Juan to St. Louis (average of $112). Flying from San Juan to St. Louis in August is currently the most expensive (average of $264). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SJU to STL?

Find hourly flight availability from San Juan to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 21, 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from San Juan to St. Louis as you normally would.

How much does it cost to fly round-trip from San Juan to St. Louis?

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated January 21, 2026.
See what other customers who have flown with Southwest, Delta, and American Airlines from San Juan to St. Louis have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,266 reviews

Food

7.0

Crew

8.6

Overall

8.0

Comfort

8.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
8.0
Very good
4,266 reviews
Southwest
8.0
Very good
4,266 reviews

Food

7.0

Crew

8.6

Overall

8.0

Comfort

8.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Delta
7.9
Good
8,087 reviews
Southwest
8.0
Very good
4,266 reviews

Food

7.0

Crew

8.6

Overall

8.0

Comfort

8.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
American Airlines
7.2
Good
11,173 reviews
Southwest
8.0
Very good
4,266 reviews

Food

7.0

Crew

8.6

Overall

8.0

Comfort

8.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Frontier
5.7
Fair
3,056 reviews
Southwest
8.0
Very good
4,266 reviews

Food

7.0

Crew

8.6

Overall

8.0

Comfort

8.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Related info for your journey

Find useful and relevant information for your journey from San Juan to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to St. Louis from San Juan?

    Located just 12.7 mi from the city center, Lambert-St Louis is the airport most travelers will use when flying to St. Louis from San Juan. Booking flights from San Juan to Lambert-St Louis (STL) should be relatively easy as there are 0 daily inbound flights from San Juan from 4 different airlines.

  • How long is the flight from San Juan to St. Louis?

    Airlines like Frontier and Delta fly from San Juan to St. Louis in about 8h 57m. The time it takes to get you to your destination can typically vary by up to 1h 02m. Airlines will cover a distance of 2024 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from San Juan to St. Louis round-trip?

    Our cheapest airline available from San Juan to St. Louis is Frontier. Our recent data shows that you can find tickets from as low as $84 on this airline. Additional options worth looking into are Delta and American Airlines, starting at $170 and $225 round-trip. These flights start at 79% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from San Juan to St. Louis one-way?

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $85. Users have also found prices from $104 and $110 on Delta and Southwest, respectively.

  • What are the cheapest flights from San Juan to St. Louis?

    While on average a flight from San Juan to St. Louis is generally $663, our data shows the cheapest flight currently is $423. When looking at the most popular route, (San Juan Luis Munoz Marin Intl - Lambert-St Louis), you can expect to pay $191 for that flight.

  • Can I find deals for flights from San Juan to St. Louis that include hotel bookings?

    Yes. In addition to deals on San Juan to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from San Juan to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Juan to St. Louis.

  • Can I find deals for business class flights from San Juan to St. Louis?

    Yes. Cheapflights offers flight deals from San Juan to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from San Juan to St. Louis?

    Currently, June is the cheapest month in which you can book a flight from San Juan to St. Louis (average of $112). Flying from San Juan to St. Louis in August is currently the most expensive (average of $264). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Edwardsville
O'Fallon
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
Chesterfield
Alton
Farmington
Festus

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for San Juan to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
Luis Munoz Marin Intl to Kansas City flights
Luis Munoz Marin Intl to St. Louis flights

Top 4 airlines flying from San Juan to St. Louis

Discover the top 4 airlines that operate flights from San Juan to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 21, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$84Average$267FlexibilityNo cancel feeOn-time62%
DeltaCheapest$170Average$375FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$225Average$424FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$342Average$610FlexibilityNo cancel feeOn-time63%

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