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$125+ Cheap flights from St. Louis (STL) to Costa Rica

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 8/11. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SJO
Aug 4 — Aug 111
Mon 8/4
Mon 8/11
1 adult, Economy
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Cheap flight deals from St. Louis to Costa Rica

Keep the following information in mind while searching for St. Louis to Costa Rica flight deals. Data was last updated July 30, 2025.

Round-trip from

$284
(American Airlines)

One-way from

$125
(American Airlines)

Popular in

December

Cheapest in

September

Average price

$582
From Lambert-St Louis to Costa Rica
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One-way flight from Lambert-St Louis to Costa Rica
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Highest demand for flights based on searches. 13% potential increase in price ($96 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($37 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find flight deals from St. Louis to Costa Rica

Cheapest flights from St. Louis to Costa Rica
Explore the most affordable flight options available from St. Louis to Costa Rica. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 30, 2025.

This American Airlines deal was found by Cheapflights users on 7/29. 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.
Fri 11/72:17 pmSTL - SJO
1 stop7h 44mAmerican Airlines
Thu 11/137:00 amSJO - STL
1 stop15h 32mAmerican Airlines
Deal found 7/29$279
This Delta deal was found by Cheapflights users on 7/27. 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.
Mon 9/296:01 amSTL - LIR
1 stop6h 59mDelta
Thu 10/21:25 pmLIR - STL
1 stop8h 59mDelta
Deal found 7/27$295
This United Airlines deal was found by Cheapflights users on 7/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/296:15 amSTL - LIR
1 stop6h 55mUnited Airlines
Fri 10/31:20 pmLIR - STL
2 stops20h 29mUnited Airlines
Deal found 7/27$299
This American Airlines deal was found by Cheapflights users on 7/27. 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.
Sat 10/48:50 amSTL - LIR
1 stop29h 11mAmerican Airlines
Thu 10/912:45 pmLIR - STL
1 stop10h 11mAmerican Airlines
Deal found 7/27$301
This Kiwi.com deal was found by Cheapflights users on 7/28. 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.
Sun 9/1410:35 amSTL - SJO
1 stop25h 39mSpirit Airlines
Sat 9/2012:19 pmSJO - STL
1 stop20h 21mSpirit Airlines
Deal found 7/28$339
This United Airlines deal was found by Cheapflights users on 7/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/126:15 amSTL - SJO
1 stop7h 11mUnited Airlines
Fri 9/197:55 amSJO - STL
1 stop13h 13mUnited Airlines
Deal found 7/29$354
This Southwest deal was found by Cheapflights users on 7/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/115:05 amSTL - SJO
1 stop8h 40mSouthwest
Fri 8/158:50 amSJO - STL
1 stop8h 25mSouthwest
Deal found 7/29$397
This Mytrip deal was found by Cheapflights users on 7/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/1412:05 pmSTL - SJO
3 stops23h 22mMultiple Airlines
Sat 9/208:14 amSJO - STL
3 stops25h 36mMultiple Airlines
Deal found 7/28$410

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Costa Rica 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 July 30, 2025.
Use the filters below to find and compare flights from St. Louis to Costa Rica that are best for you.

Fly from

St. Louis

Fly to

Costa Rica

Route

Depart

Return

Price

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Fri 11/7

2:17 pm-10:01 pm

1 stop7h 44m

San José Juan Santamaria Intl

Thu 11/13

7:00 am-10:32 pm

1 stop15h 32m

$279

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Mon 9/29

6:01 am-12:00 pm

1 stop6h 59m

Liberia

Thu 10/2

1:25 pm-11:24 pm

1 stop8h 59m

$295

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Mon 9/29

6:15 am-12:10 pm

1 stop6h 55m

Liberia

Fri 10/3

1:20 pm-10:49 am

2 stops20h 29m

$299

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Sat 10/4

8:50 am-1:01 pm

1 stop29h 11m

Liberia

Thu 10/9

12:45 pm-11:56 pm

1 stop10h 11m

$301

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Sun 9/14

10:35 am-11:14 am

1 stop25h 39m

San José Juan Santamaria Intl

Sat 9/20

12:19 pm-9:40 am

1 stop20h 21m

$339

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Fri 9/12

6:15 am-12:26 pm

1 stop7h 11m

San José Juan Santamaria Intl

Fri 9/19

7:55 am-10:08 pm

1 stop13h 13m

$354

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Mon 8/11

5:05 am-12:45 pm

1 stop8h 40m

San José Juan Santamaria Intl

Fri 8/15

8:50 am-6:15 pm

1 stop8h 25m

$397

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Sun 9/14

12:05 pm-10:27 am

3 stops23h 22m

San José Juan Santamaria Intl

Sat 9/20

8:14 am-10:50 am

3 stops25h 36m

$410

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Mon 8/11

6:26 am-12:55 pm

1 stop7h 29m

$125

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Sat 10/11

7:00 pm-11:14 am

1 stop17h 14m

$144

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 13 results
1
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Best time to book a flight from St. Louis to Costa Rica

Have a flexible travel schedule? Discover the best time to fly to Costa Rica from St. Louis 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 St. Louis to Costa Rica

What is the cheapest month to book a flight from St. Louis to Costa Rica?

Currently, September is the cheapest month in which you can book a flight from St. Louis to Costa Rica (average of $398). Flying from St. Louis to Costa Rica in March is currently the most expensive (average of $555). 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 STL to CR?

Find hourly flight availability from St. Louis to Costa Rica. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 30, 2025.

When flying from St. Louis to Costa Rica, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Reviews of airlines servicing Costa Rica

Get insights into the airlines that provide service to Costa Rica. 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 Costa Rica. Reviews last updated July 30, 2025.
Read through reviews of airlines operating flights from St. Louis to Costa Rica, such as Southwest, Delta, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,241 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Southwest
8.0
Very good
4,241 reviews
Southwest
8.0
Very good
4,241 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Delta
8.0
Very good
7,980 reviews
Southwest
8.0
Very good
4,241 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
United Airlines
7.4
Good
8,896 reviews
Southwest
8.0
Very good
4,241 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,241 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Spirit Airlines
6.3
Okay
8,048 reviews
Southwest
8.0
Very good
4,241 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Costa Rica. 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 from for flights from St. Louis to Costa Rica?

    If you book a flight to Costa Rica from St. Louis, you will be flying from Lambert-St Louis, which is the city’s only airport. Lambert-St Louis (STL) is located 12.7 mi from the center of St. Louis.

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

    The cheapest airline one-way is American Airlines, with whom users have recently found tickets for as low as $125. However, be on the lookout for offers from Spirit Airlines and United Airlines, as they are both options that can get you from St. Louis to Costa Rica for a low price.

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

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

  • How can I find direct flights from St. Louis to Costa Rica?

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

  • Can I find deals for business class flights from St. Louis to Costa Rica?

    Yes. Cheapflights offers flight deals from St. Louis to Costa Rica 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 St. Louis to Costa Rica?

    Currently, September is the cheapest month in which you can book a flight from St. Louis to Costa Rica (average of $398). Flying from St. Louis to Costa Rica in March is currently the most expensive (average of $555). 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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for St. Louis to Costa Rica

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from St. Louis to Costa Rica

Discover the top 5 airlines that operate flights from St. Louis to Costa Rica. 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 July 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$257Average$593FlexibilityNo cancel feeOn-timeN/A
Spirit AirlinesCheapest$263Average$446FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$376Average$572FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$404Average$602FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$435Average$666FlexibilityNo cancel feeOn-time63%

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