HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Costa Rica

$155+ 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 9/30. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SJO
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis to Costa Rica with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 April 17, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$318
(Mytrip)

One-way from

$155
(Delta)

Popular in

December

Cheapest in

September

Average price

$593
Provider with most accurate pricing for Lambert-St Louis-San José Juan Santamaria Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-San José Juan Santamaria Intl flights.
Search Deals
From Lambert-St Louis to Costa Rica
Search Deals
One-way flight from Lambert-St Louis to Costa Rica
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($91 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals

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 April 17, 2025.

This Kiwi.com deal was found by Cheapflights users on 4/16. 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.
Mon 5/125:45 pmSTL - SJO
2 stops42h 48mMultiple Airlines
Fri 6/1311:32 amSJO - STL
1 stop11h 21mMultiple Airlines
Deal found 4/16$333
This American Airlines deal was found by Cheapflights users on 4/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/75:13 amSTL - SJO
1 stop14h 22mAmerican Airlines
Wed 5/2811:59 pmSJO - STL
1 stop8h 00mAmerican Airlines
Deal found 4/16$340
This Delta deal was found by Cheapflights users on 4/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/36:00 amSTL - SJO
1 stop6h 48mDelta
Wed 9/171:18 pmSJO - STL
1 stop9h 21mDelta
Deal found 4/16$342
This Delta deal was found by Cheapflights users on 4/17. 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.
Tue 6/106:00 amSTL - LIR
1 stop7h 00mDelta
Tue 6/171:25 pmLIR - STL
1 stop9h 26mDelta
Deal found 4/17$385
This American Airlines deal was found by Cheapflights users on 4/17. 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.
Tue 5/277:19 pmSTL - LIR
2 stops19h 07mAmerican Airlines
Tue 6/312:45 pmLIR - STL
2 stops19h 57mAmerican Airlines
Deal found 4/17$389
This Air Canada deal was found by Cheapflights users on 4/17. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/57:30 amSTL - SJO
1 stop16h 20mAir Canada
Wed 6/188:00 amSJO - STL
1 stop27h 36mAir Canada
Deal found 4/17$416
This United Airlines deal was found by Cheapflights users on 4/17. 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.
Fri 10/38:27 amSTL - SJO
1 stop12h 10mUnited Airlines
Fri 10/1012:44 pmSJO - STL
1 stop10h 00mUnited Airlines
Deal found 4/17$423
This United Airlines deal was found by Cheapflights users on 4/17. 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.
Sun 6/85:55 pmSTL - LIR
1 stop17h 05mUnited Airlines
Wed 6/1111:05 amLIR - STL
1 stop8h 44mUnited Airlines
Deal found 4/17$475
This Alaska Airlines deal was found by Cheapflights users on 4/16. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/42:55 pmSTL - SJO
3 stops32h 05mAlaska Airlines
Mon 11/102:26 amSJO - STL
2 stops35h 26mAlaska Airlines
Deal found 4/16$711
This Alaska Airlines deal was found by Cheapflights users on 4/17. 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.
Sat 4/263:08 pmSTL - LIR
2 stops16h 12mAlaska Airlines
Fri 5/211:20 amLIR - STL
2 stops25h 48mAlaska Airlines
Deal found 4/17$1,069

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 April 17, 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

Mon 5/12

5:45 pm-11:33 am

2 stops42h 48m

San José Juan Santamaria Intl

Fri 6/13

11:32 am-11:53 pm

1 stop11h 21m

$333

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Wed 5/7

5:13 am-6:35 pm

1 stop14h 22m

San José Juan Santamaria Intl

Wed 5/28

11:59 pm-8:59 am

1 stop8h 00m

$340

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Tue 6/10

6:00 am-12:00 pm

1 stop7h 00m

Liberia

Tue 6/17

1:25 pm-11:51 pm

1 stop9h 26m

$385

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Tue 5/27

7:19 pm-1:26 pm

2 stops19h 07m

Liberia

Tue 6/3

12:45 pm-9:42 am

2 stops19h 57m

$389

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Thu 6/5

7:30 am-10:50 pm

1 stop16h 20m

San José Juan Santamaria Intl

Wed 6/18

8:00 am-12:36 pm

1 stop27h 36m

$416

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Mon 6/2

5:55 pm-10:11 am

1 stop17h 16m

San José Juan Santamaria Intl

Mon 6/9

5:30 am-10:15 pm

1 stop15h 45m

$452

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Sun 6/8

5:55 pm-10:00 am

1 stop17h 05m

Liberia

Wed 6/11

11:05 am-8:49 pm

1 stop8h 44m

$475

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Sat 6/21

6:00 am-12:00 pm

1 stop7h 00m

San José Juan Santamaria Intl

Sat 6/28

2:30 pm-11:51 pm

1 stop8h 21m

$506

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Thu 5/15

3:03 pm-11:46 pm

2 stops33h 43m

San José Juan Santamaria Intl

Wed 5/21

1:06 am-12:04 am

2 stops21h 58m

$736

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Sat 7/5

8:15 am-3:35 am

1 stop20h 20m

San José Juan Santamaria Intl

Fri 7/11

1:55 am-7:00 pm

2 stops16h 05m

$4,400

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/15

Showing 1-10 of 18 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 April 17, 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 April 17, 2025.
Read reviews from past customers who have flown Alaska Airlines, Delta and United Airlines 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
9,887 reviews

Food

7.1

Comfort

7.9

Entertainment

7.1

Boarding

8.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Alaska Airlines
8.0
Very good
9,887 reviews
Alaska Airlines
8.0
Very good
9,887 reviews

Food

7.1

Comfort

7.9

Entertainment

7.1

Boarding

8.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Delta
8.0
Very good
7,916 reviews
Alaska Airlines
8.0
Very good
9,887 reviews

Food

7.1

Comfort

7.9

Entertainment

7.1

Boarding

8.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
United Airlines
7.4
Good
8,667 reviews
Alaska Airlines
8.0
Very good
9,887 reviews

Food

7.1

Comfort

7.9

Entertainment

7.1

Boarding

8.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,887 reviews

Food

7.1

Comfort

7.9

Entertainment

7.1

Boarding

8.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Air Canada
7.0
Good
9,143 reviews
Alaska Airlines
8.0
Very good
9,887 reviews

Food

7.1

Comfort

7.9

Entertainment

7.1

Boarding

8.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

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 Delta, with whom users have recently found tickets for as low as $155. However, be on the lookout for offers from American Airlines and Spirit 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to Costa Rica

See prices for flight routes from nearby airports that may be better suited for you.
St. Louis to San José flights
Kansas City to San Salvador flights
Kansas City to San José flights
St. Louis to Philip S.W.Goldson flights
Kansas City to Philip S.W.Goldson flights
Kansas City to Panama City flights
St. Louis to Panama City flights
St. Louis to Liberia flights
Kansas City to Guatemala City flights
Kansas City to Liberia flights
St. Louis to Coxen Hole flights
Springfield to San José flights
Kansas City to San Pedro Sula flights
Springfield to Guatemala City flights
St. Louis to Guatemala City flights
St. Louis to San Pedro Sula flights
Kansas City to Coxen Hole flights
St. Louis to Managua flights
Kansas City to Managua flights
Springfield to Philip S.W.Goldson flights
St. Louis to Tegucigalpa flights
Kansas City to Tegucigalpa flights
Springfield to Coxen Hole flights
Springfield to Panama City flights
Columbia to Liberia 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 April 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$246Average$322FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$388Average$608FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$389Average$588FlexibilityNo cancel feeOn-time71%
DeltaCheapest$398Average$614FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$443Average$766FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.