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$124+ 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 10/19. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SJO
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
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 September 15, 2025.

Round-trip from

$315
(United Airlines)

One-way from

$124
(American Airlines)

Popular in

December

Cheapest in

September

Average price

$446
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. 14% potential increase in price ($100 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($36 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 15, 2025.

This Delta deal was found by Cheapflights users on 9/15. 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
Fri 10/31:25 pmLIR - STL
1 stop8h 59mDelta
Deal found 9/15$315
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Thu 10/308:20 amSTL - LIR
1 stop10h 17mUnited Airlines
Thu 11/62:20 pmLIR - STL
1 stop8h 02mUnited Airlines
Deal found 9/15$317
This American Airlines deal was found by Cheapflights users on 9/14. 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.
Mon 9/297:59 pmSTL - LIR
2 stops16h 50mAmerican Airlines
Fri 10/32:02 pmLIR - STL
2 stops18h 24mAmerican Airlines
Deal found 9/14$319
This American Airlines deal was found by Cheapflights users on 9/15. 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 10/305:11 amSTL - LIR
1 stop8h 48mAmerican Airlines
Thu 11/61:21 pmLIR - STL
2 stops19h 36mAmerican Airlines
Deal found 9/15$321
This American Airlines deal was found by Cheapflights users on 9/14. 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 11/15:09 pmSTL - LIR
2 stops22h 04mAmerican Airlines
Sat 11/82:37 pmLIR - STL
1 stop9h 19mAmerican Airlines
Deal found 9/14$339
This Expedia deal was found by Cheapflights users on 9/14. 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 12/412:20 pmSTL - SJO
1 stop12h 01mSpirit Airlines
Wed 12/101:16 amSJO - STL
1 stop9h 45mSpirit Airlines
Deal found 9/14$344
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 10/910:57 amSTL - SJO
1 stop25h 33mMultiple Airlines
Tue 10/146:10 pmSJO - STL
2 stops38h 52mMultiple Airlines
Deal found 9/14$354
This American Airlines deal was found by Cheapflights users on 9/14. 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.
Tue 10/2112:51 pmSTL - LIR
2 stops23h 54mAmerican Airlines
Sat 10/251:59 pmLIR - STL
1 stop8h 19mAmerican Airlines
Deal found 9/14$356
This Delta deal was found by Cheapflights users on 9/15. 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.
Tue 11/186:00 amSTL - SJO
1 stop7h 06mDelta
Tue 11/252:31 pmSJO - STL
1 stop7h 27mDelta
Deal found 9/15$360
This Southwest deal was found by Cheapflights users on 9/14. 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.
Tue 10/145:30 amSTL - SJO
1 stop7h 35mSouthwest
Fri 10/1712:55 pmSJO - STL
1 stop8h 30mSouthwest
Deal found 9/14$361
This American Airlines deal was found by Cheapflights users on 9/14. 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.
Tue 11/187:00 amSTL - SJO
2 stops15h 13mAmerican Airlines
Tue 11/251:11 pmSJO - STL
2 stops10h 54mAmerican Airlines
Deal found 9/14$364
This American Airlines deal was found by Cheapflights users on 9/13. 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 11/65:15 amSTL - LIR
1 stop7h 03mAmerican Airlines
Thu 11/133:13 pmLIR - STL
1 stop17h 44mAmerican Airlines
Deal found 9/13$365

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 September 15, 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. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Mon 9/29

6:01 am-12:00 pm

1 stop6h 59m

Liberia

Fri 10/3

1:25 pm-11:24 pm

1 stop8h 59m

$315

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Sat 11/29

6:45 pm-2:13 pm

2 stops19h 28m

Liberia

Fri 12/5

1:25 pm-11:59 pm

1 stop10h 34m

$319

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Mon 9/29

2:11 pm-11:49 am

2 stops22h 38m

Liberia

Fri 10/3

12:49 pm-11:59 pm

1 stop10h 10m

$319

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Sun 11/2

5:17 am-2:07 pm

1 stop8h 50m

Liberia

Sat 11/8

2:37 pm-11:56 pm

1 stop9h 19m

$335

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Thu 11/6

6:45 pm-2:13 pm

2 stops19h 28m

Liberia

Thu 11/13

3:13 pm-8:57 am

1 stop17h 44m

$339

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Sat 12/6

6:03 pm-12:25 pm

2 stops18h 22m

Liberia

Sat 12/13

1:14 pm-8:11 am

2 stops18h 57m

$339

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Sat 11/1

4:25 pm-12:18 pm

2 stops20h 53m

Liberia

Sat 11/8

3:13 pm-8:58 am

2 stops17h 45m

$339

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Thu 10/9

10:57 am-11:30 am

1 stop25h 33m

San José Juan Santamaria Intl

Tue 10/14

6:10 pm-10:02 am

2 stops38h 52m

$354

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Sun 11/16

11:44 am-10:07 pm

1 stop10h 23m

San José Juan Santamaria Intl

Thu 11/20

7:00 am-9:04 pm

1 stop14h 04m

$360

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Mon 10/27

6:00 am-11:58 am

1 stop6h 58m

San José Juan Santamaria Intl

Tue 11/25

2:31 pm-9:58 pm

1 stop7h 27m

$360

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Showing 1-10 of 30 results
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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 September 15, 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 September 15, 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
4,242 reviews

Entertainment

7.5

Overall

8.0

Boarding

8.1

Food

7.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Overall

8.0

Boarding

8.1

Food

7.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
8.0
Very good
7,954 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Overall

8.0

Boarding

8.1

Food

7.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,929 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Overall

8.0

Boarding

8.1

Food

7.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Overall

8.0

Boarding

8.1

Food

7.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Spirit Airlines
6.3
Okay
8,015 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Overall

8.0

Boarding

8.1

Food

7.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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.

  • How long is the flight from St. Louis to Costa Rica?

    Airlines like Delta and American Airlines fly from St. Louis to Costa Rica in about 6h 59m. The time it takes to get you to your destination can typically vary by up to 12h 29m. The distance between St. Louis and Costa Rica is about 1967 mi. This flight may include one or multiple stops.

  • 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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$257Average$552FlexibilityNo cancel feeOn-timeN/A
Spirit AirlinesCheapest$263Average$446FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$334Average$576FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$354Average$572FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$393Average$671FlexibilityNo cancel feeOn-time63%

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