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$141+ 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 11/20. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SJO
Dec 3 — Dec 101
Wed 12/3
Wed 12/10
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 November 3, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$299
(Orbitz)

One-way from

$141
(Trip.com)

Popular in

December

Cheapest in

September

Average price

$502
Provider with most accurate pricing for Lambert-St Louis-San José Juan Santamaria Intl flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-San José Juan Santamaria Intl flights.
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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. 18% potential increase in price ($133 potential increase over avg. RT price).
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Cheapest flight prices on average. 8% potential price decrease ($46 potential savings vs. average RT price).
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Average for round-trip flights in November 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 November 3, 2025.

This Kiwi.com deal was found by Cheapflights users on 11/1. 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 12/3011:51 amSTL - SJO
1 stop24h 34mSpirit Airlines
Wed 1/211:19 pmSJO - STL
1 stop21h 42mSpirit Airlines
Deal found 11/1$330
This Kiwi.com deal was found by Cheapflights users on 11/1. 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 12/3011:51 amSTL - SJO
1 stop24h 34mMultiple Airlines
Tue 1/201:16 amSJO - STL
2 stops21h 17mMultiple Airlines
Deal found 11/1$342
This Kiwi.com deal was found by Cheapflights users on 11/1. 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 12/3011:51 amSTL - SJO
1 stop24h 34mMultiple Airlines
Sat 1/175:10 pmSJO - STL
2 stops16h 36mMultiple Airlines
Deal found 11/1$363
This Kiwi.com deal was found by Cheapflights users on 11/3. 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.
Wed 12/33:30 pmSTL - SJO
1 stop20h 12mMultiple Airlines
Wed 12/101:31 pmSJO - STL
1 stop24h 21mMultiple Airlines
Deal found 11/3$364
This American Airlines deal was found by Cheapflights users on 11/2. 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.
Wed 11/268:39 amSTL - SJO
1 stop13h 34mAmerican Airlines
Thu 12/41:15 pmSJO - STL
1 stop10h 44mAmerican Airlines
Deal found 11/2$365
This Kiwi.com deal was found by Cheapflights users on 11/2. 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 12/133:30 pmSTL - SJO
1 stop20h 12mMultiple Airlines
Sat 12/201:31 pmSJO - STL
1 stop21h 25mMultiple Airlines
Deal found 11/2$374
This Kiwi.com deal was found by Cheapflights users on 11/1. 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.
Wed 12/314:27 pmSTL - SJO
1 stop19h 15mMultiple Airlines
Wed 1/211:19 pmSJO - STL
1 stop21h 42mMultiple Airlines
Deal found 11/1$379
This Delta deal was found by Cheapflights users on 11/3. 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 11/2711:04 amSTL - SJO
1 stop11h 03mDelta
Fri 12/57:00 amSJO - STL
1 stop10h 56mDelta
Deal found 11/3$380
This Delta deal was found by Cheapflights users on 11/3. 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 11/187:05 amSTL - SJO
1 stop15h 02mDelta
Tue 11/257:00 amSJO - STL
1 stop11h 35mDelta
Deal found 11/3$388
This American Airlines deal was found by Cheapflights users on 11/3. 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 11/295:00 amSTL - LIR
1 stop7h 28mAmerican Airlines
Fri 12/53:20 pmLIR - STL
1 stop8h 39mAmerican Airlines
Deal found 11/3$423
This American Airlines deal was found by Cheapflights users on 11/3. 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 12/66:03 pmSTL - LIR
2 stops18h 27mAmerican Airlines
Sat 12/132:40 pmLIR - STL
1 stop17h 28mAmerican Airlines
Deal found 11/3$427
This American Airlines deal was found by Cheapflights users on 11/2. 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.
Wed 12/105:10 amSTL - LIR
1 stop7h 15mAmerican Airlines
Sun 12/141:25 pmLIR - STL
1 stop10h 34mAmerican Airlines
Deal found 11/2$428

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 November 3, 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

Fri 1/9

6:40 pm-1:10 pm

2 stops18h 30m

Liberia

Thu 1/15

2:20 pm-10:00 pm

1 stop7h 40m

$349

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Fri 1/9

6:00 am-2:20 pm

1 stop8h 20m

Liberia

Thu 1/15

3:13 pm-11:59 pm

1 stop8h 46m

$349

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Fri 1/9

6:00 am-12:50 pm

1 stop6h 50m

Liberia

Thu 1/15

2:45 pm-11:25 pm

1 stop8h 40m

$349

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Thu 1/22

5:59 pm-12:37 pm

2 stops18h 38m

Liberia

Sun 1/25

3:13 pm-11:05 am

2 stops19h 52m

$358

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Wed 11/26

8:39 am-10:13 pm

1 stop13h 34m

San José Juan Santamaria Intl

Thu 12/4

7:00 am-6:03 pm

2 stops11h 03m

$369

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Thu 11/27

11:04 am-10:07 pm

1 stop11h 03m

San José Juan Santamaria Intl

Fri 12/5

7:00 am-5:56 pm

1 stop10h 56m

$380

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Thu 12/4

11:40 am-10:20 pm

1 stop10h 40m

San José Juan Santamaria Intl

Wed 12/10

7:00 am-4:21 pm

1 stop9h 21m

$380

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Tue 11/18

9:33 am-10:07 pm

1 stop12h 34m

San José Juan Santamaria Intl

Tue 11/25

7:00 am-4:07 pm

1 stop9h 07m

$388

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Tue 11/18

6:52 am-10:13 pm

2 stops15h 21m

San José Juan Santamaria Intl

Tue 11/25

7:00 am-7:30 pm

2 stops12h 30m

$392

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Fri 1/30

9:59 am-10:15 pm

1 stop12h 16m

San José Juan Santamaria Intl

Sat 2/7

2:31 pm-11:40 pm

1 stop9h 09m

$400

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/2

Showing 1-10 of 32 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 $294). Flying from St. Louis to Costa Rica in December is currently the most expensive (average of $464). 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 November 3, 2025.

A simple way to save on the total cost of your ticket is to fly from St. Louis to Costa Rica in the evening. If you’re flexible enough to do this you can expect to save up to 25% on your trip compared to booking a flight at noon.

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 November 3, 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
4,238 reviews

Crew

8.6

Comfort

8.0

Overall

8.0

Entertainment

7.5

Food

7.0

Boarding

8.1

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
4,238 reviews
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Comfort

8.0

Overall

8.0

Entertainment

7.5

Food

7.0

Boarding

8.1

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
7.9
Good
8,002 reviews
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Comfort

8.0

Overall

8.0

Entertainment

7.5

Food

7.0

Boarding

8.1

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
8,997 reviews
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Comfort

8.0

Overall

8.0

Entertainment

7.5

Food

7.0

Boarding

8.1

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
11,038 reviews
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Comfort

8.0

Overall

8.0

Entertainment

7.5

Food

7.0

Boarding

8.1

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
8,115 reviews
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Comfort

8.0

Overall

8.0

Entertainment

7.5

Food

7.0

Boarding

8.1

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 United Airlines, American Airlines, and Delta fly from St. Louis to Costa Rica in about 6h 50m. The time it takes to get you to your destination can typically vary by up to 11h 40m. The distance between St. Louis and Costa Rica is about 1967 mi. This flight may include one or multiple stops.

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

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $155. However, be on the lookout for offers from American 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 $294). Flying from St. Louis to Costa Rica in December is currently the most expensive (average of $464). 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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Kansas City to Coxen Hole flights
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Springfield to Philip S.W.Goldson flights
Springfield to Guatemala City flights
Columbia to Liberia flights
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Kansas City to Managua flights
St. Louis to Managua flights
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Kansas City to Tegucigalpa flights
St. Louis to Tegucigalpa flights

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 November 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$257Average$544FlexibilityNo cancel feeOn-timeN/A
Spirit AirlinesCheapest$263Average$446FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$334Average$565FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$337Average$565FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$383Average$633FlexibilityNo cancel feeOn-time63%

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