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$157+ 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 10/24. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SJO
Jun 23 — Jun 301
Mon 6/23
Mon 6/30
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 June 18, 2025.

Round-trip from

$333
(Delta)

One-way from

$162
(American Airlines)

Popular in

December

Cheapest in

September

Average price

$592
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. 11% potential increase in price ($80 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($34 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 18, 2025.

This Southwest deal was found by Cheapflights users on 6/17. 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 11/109:50 amSTL - SJO
1 stop10h 40mSouthwest
Fri 11/142:10 pmSJO - STL
1 stop8h 35mSouthwest
Deal found 6/17$286
This American Airlines deal was found by Cheapflights users on 6/17. 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 10/67:00 pmSTL - SJO
2 stops19h 00mAmerican Airlines
Thu 10/92:25 pmSJO - STL
2 stops20h 35mAmerican Airlines
Deal found 6/17$290
This American Airlines deal was found by Cheapflights users on 6/17. 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 9/227:10 amSTL - LIR
1 stop6h 52mAmerican Airlines
Tue 9/3012:49 pmLIR - STL
2 stops19h 37mAmerican Airlines
Deal found 6/17$299
This Delta deal was found by Cheapflights users on 6/17. 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 9/226:00 amSTL - LIR
1 stop7h 00mDelta
Tue 9/301:25 pmLIR - STL
1 stop7h 34mDelta
Deal found 6/17$305
This Delta deal was found by Cheapflights users on 6/17. 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.
Sat 9/66:00 amSTL - SJO
1 stop7h 10mDelta
Thu 9/181:18 pmSJO - STL
1 stop9h 21mDelta
Deal found 6/17$333
This Southwest deal was found by Cheapflights users on 6/17. 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.
Sat 7/55:20 amSTL - LIR
1 stop8h 45mSouthwest
Sat 7/1212:15 pmLIR - STL
1 stop8h 45mSouthwest
Deal found 6/17$335
This Kiwi.com deal was found by Cheapflights users on 6/17. 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 7/155:26 pmSTL - SJO
1 stop18h 45mSpirit Airlines
Tue 7/2211:24 amSJO - STL
1 stop22h 05mSpirit Airlines
Deal found 6/17$353
This United Airlines deal was found by Cheapflights users on 6/17. 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 11/106:43 pmSTL - SJO
2 stops16h 42mUnited Airlines
Fri 11/1412:35 pmSJO - STL
2 stops21h 52mUnited Airlines
Deal found 6/17$390
This United Airlines deal was found by Cheapflights users on 6/18. 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 7/186:15 amSTL - LIR
1 stop9h 08mUnited Airlines
Thu 7/2411:49 amLIR - STL
1 stop9h 01mUnited Airlines
Deal found 6/18$405
This Kiwi.com deal was found by Cheapflights users on 6/16. 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.
Sat 7/193:34 pmSTL - SJO
2 stops17h 06mMultiple Airlines
Fri 7/2512:16 pmSJO - STL
1 stop25h 23mMultiple Airlines
Deal found 6/16$448
This Alaska Airlines deal was found by Cheapflights users on 6/17. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/226:00 amSTL - LIR
2 stops25h 20mAlaska Airlines
Tue 9/3011:20 amLIR - STL
3 stops26h 19mAlaska Airlines
Deal found 6/17$548
This Air Canada deal was found by Cheapflights users on 6/16. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/265:18 pmSTL - LIR
3 stops20h 37mMultiple Airlines
Fri 1/21:55 pmLIR - STL
2 stops24h 23mMultiple Airlines
Deal found 6/16$4,228

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 June 18, 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 9/22

7:10 am-1:02 pm

1 stop6h 52m

Liberia

Tue 9/30

12:49 pm-9:26 am

2 stops19h 37m

$299

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Mon 9/22

6:00 am-12:00 pm

1 stop7h 00m

Liberia

Tue 9/30

1:25 pm-9:59 pm

1 stop7h 34m

$305

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Sat 9/6

6:00 am-12:10 pm

1 stop7h 10m

San José Juan Santamaria Intl

Thu 9/18

1:18 pm-11:39 pm

1 stop9h 21m

$333

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Sat 7/5

5:20 am-1:05 pm

1 stop8h 45m

Liberia

Sat 7/12

12:15 pm-10:00 pm

1 stop8h 45m

$335

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Sat 9/6

6:35 am-7:37 pm

2 stops14h 02m

San José Juan Santamaria Intl

Thu 9/18

1:30 pm-10:08 pm

1 stop7h 38m

$337

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Tue 7/15

5:26 pm-11:11 am

1 stop18h 45m

San José Juan Santamaria Intl

Tue 7/22

11:24 am-10:29 am

1 stop22h 05m

$353

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Fri 7/18

6:15 am-2:23 pm

1 stop9h 08m

Liberia

Thu 7/24

11:49 am-9:50 pm

1 stop9h 01m

$405

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Tue 7/15

5:26 pm-7:20 am

2 stops14h 54m

San José Juan Santamaria Intl

Tue 7/22

11:24 am-10:29 am

1 stop22h 05m

$420

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Sat 7/5

7:03 am-10:05 pm

1 stop16h 02m

San José Juan Santamaria Intl

Sat 7/12

11:59 pm-9:18 am

1 stop8h 19m

$423

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Sun 8/3

5:40 am-11:00 am

1 stop6h 20m

San José Juan Santamaria Intl

Sat 8/16

8:45 am-9:40 pm

1 stop11h 55m

$444

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/18

Showing 1-10 of 20 results
1
2

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 June 18, 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.

Rainfall in Costa Rica by month

Plan your trip to Costa Rica by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Costa Rica ranges from 0.0 - 11.8 inches per month. September is typically the wettest month, when rainfall can reach 11.8 in. February is typically the driest time to visit Costa Rica when rainfall is around 0.0 in.

Temperature in Costa Rica by month

Plan your trip to Costa Rica by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Costa Rica, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 64.4 F).

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 June 18, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest and Delta from St. Louis to Costa Rica. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
Southwest
8.0
Very good
4,280 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
Delta
8.0
Very good
7,964 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
Copa Airlines
7.5
Good
1,455 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
United Airlines
7.4
Good
8,810 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.

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 $162. 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

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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 June 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$247Average$394FlexibilityNo cancel feeOn-time65%
DeltaCheapest$257Average$598FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$386Average$577FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$399Average$598FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$443Average$678FlexibilityNo cancel feeOn-time63%

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