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Cheap flights from St. Louis to Costa Rica from $243

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Costa Rica departing on 9/30. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Costa Rica

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
6:44 pm - 2:17 pmSTL  Lambert-St Louis-LIR Liberia
19h 33m2 stops Dallas/Fort Worth Miami
American Airlines Logo
3:17 pm - 10:53 amLIR  Liberia-STL Lambert-St Louis
19h 36m2 stops Dallas/Fort Worth Chicago O'Hare Intl
$411American Airlines
Sat, Dec 5 - Fri, Dec 11
Air Canada Logo
4:05 pm - 1:10 pmSTL  Lambert-St Louis-LIR Liberia
22h 05m1 stop Toronto Pearson Intl
Air Canada Logo
3:10 pm - 3:26 pmLIR  Liberia-STL Lambert-St Louis
24h 16m1 stop Toronto Pearson Intl
$420Air Canada
Thu, Oct 29 - Sun, Nov 1
American Airlines Logo
6:15 pm - 2:17 pmSTL  Lambert-St Louis-LIR Liberia
20h 02m1 stop Miami
American Airlines Logo
3:35 pm - 12:28 pmLIR  Liberia-STL Lambert-St Louis
20h 53m2 stops Miami Dallas/Fort Worth
$421American Airlines
Sat, Dec 5 - Fri, Dec 11
Air Canada Logo
4:05 pm - 2:10 pmSTL  Lambert-St Louis-LIR Liberia
22h 05m1 stop Toronto Pearson Intl
Air Canada Logo
3:10 pm - 3:26 pmLIR  Liberia-STL Lambert-St Louis
24h 16m1 stop Toronto Pearson Intl
$430Air Canada
Mon, Jan 25 - Wed, Jan 27
Southwest Logo
8:25 pm - 1:15 pmSTL  Lambert-St Louis-SJO San José Juan Santamaria Intl
16h 50m2 stops Chicago Midway Orlando
Southwest Logo
1:20 pm - 10:25 pmSJO  San José Juan Santamaria Intl-STL Lambert-St Louis
9h 05m1 stop Orlando
$516Southwest
Tue, Nov 3 - Tue, Nov 10
Southwest Logo
8:25 pm - 1:15 pmSTL  Lambert-St Louis-SJO San José Juan Santamaria Intl
16h 50m2 stops Chicago Midway Orlando
Southwest Logo
1:20 pm - 7:40 amSJO  San José Juan Santamaria Intl-STL Lambert-St Louis
18h 20m2 stops Orlando Baltimore/Washington
$516Southwest
Tue, Nov 3 - Tue, Nov 10
United Airlines Logo
6:15 am - 12:10 pmSTL  Lambert-St Louis-LIR Liberia
6h 55m1 stop Houston George Bush Intcntl
United Airlines Logo
4:20 pm - 8:53 amLIR  Liberia-STL Lambert-St Louis
15h 33m1 stop Newark
$518United Airlines
Mon, Oct 26 - Tue, Oct 27
United Airlines Logo
6:15 am - 1:22 pmSTL  Lambert-St Louis-SJO San José Juan Santamaria Intl
7h 07m1 stop Houston George Bush Intcntl
United Airlines Logo
8:45 am - 4:46 pmSJO  San José Juan Santamaria Intl-STL Lambert-St Louis
8h 01m1 stop Houston George Bush Intcntl
$530United Airlines
Sun, Nov 1 - Fri, Nov 6
Delta Logo
7:20 pm - 12:00 pmSTL  Lambert-St Louis-SJO San José Juan Santamaria Intl
17h 40m1 stop Atlanta Hartsfield-Jackson
Delta Logo
1:25 pm - 11:54 pmSJO  San José Juan Santamaria Intl-STL Lambert-St Louis
9h 29m1 stop Atlanta Hartsfield-Jackson
$530Delta
Sun, Oct 18 - Tue, Oct 27
Delta Logo
6:00 am - 12:00 pmSTL  Lambert-St Louis-SJO San José Juan Santamaria Intl
7h 00m1 stop Atlanta Hartsfield-Jackson
Delta Logo
2:25 pm - 9:59 pmSJO  San José Juan Santamaria Intl-STL Lambert-St Louis
7h 34m1 stop Atlanta Hartsfield-Jackson
$530Delta
Sun, Oct 25 - Tue, Nov 3

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Frontier flights from St. Louis to Costa Rica

Our best Frontier deals on St. Louis to Costa Rica flight tickets
Frontier
Oct 9
STL8:34 pmLambert-St Louis
11h 56m
1 stop
SJO7:30 amSan José Juan Santamaria Intl
Oct 17
SJO8:45 amSan José Juan Santamaria Intl
9h 54m
1 stop
STL7:39 pmLambert-St Louis
$478
Frontier
Oct 9
STL10:35 amLambert-St Louis
21h 55m
2 stops
SJO7:30 amSan José Juan Santamaria Intl
Oct 17
SJO8:45 amSan José Juan Santamaria Intl
9h 54m
1 stop
STL7:39 pmLambert-St Louis
$479
Frontier
Oct 9
STL8:34 pmLambert-St Louis
11h 56m
1 stop
SJO7:30 amSan José Juan Santamaria Intl
Oct 17
SJO8:45 amSan José Juan Santamaria Intl
23h 55m
2 stops
STL9:40 amLambert-St Louis
$494

Southwest flights from St. Louis to Costa Rica

Our best Southwest deals on St. Louis to Costa Rica flight tickets
Southwest
Nov 3
STL8:25 pmLambert-St Louis
16h 50m
2 stops
SJO1:15 pmSan José Juan Santamaria Intl
Nov 10
SJO1:20 pmSan José Juan Santamaria Intl
18h 20m
2 stops
STL7:40 amLambert-St Louis
$516
Southwest
Jan 31
STL7:55 pmLambert-St Louis
16h 55m
2 stops
SJO12:50 pmSan José Juan Santamaria Intl
Feb 9
SJO1:50 pmSan José Juan Santamaria Intl
17h 50m
2 stops
STL7:40 amLambert-St Louis
$537
Southwest
Oct 26
STL8:30 amLambert-St Louis
12h 10m
2 stops
SJO7:40 pmSan José Juan Santamaria Intl
Oct 27
SJO9:00 amSan José Juan Santamaria Intl
10h 00m
2 stops
STL8:00 pmLambert-St Louis
$549

momondo 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, momondo users made 832,500 searches. Data last updated August 10, 2026.
Use the filters below to find and compare flights from St. Louis to Costa Rica that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisLiberia

STL Lambert-St Louis - LIR Liberia

STLLIR

Lambert-St Louis

Sat 12/5

6:44 pm-2:17 pm

2 stops19h 33m

Liberia

Fri 12/11

3:17 pm-10:53 am

2 stops19h 36m

$411

St. LouisLiberia

STL Lambert-St Louis - LIR Liberia

STLLIR

Lambert-St Louis

Thu 10/29

4:05 pm-1:10 pm

1 stop22h 05m

Liberia

Sun 11/1

3:10 pm-3:26 pm

1 stop24h 16m

$420

St. LouisLiberia

STL Lambert-St Louis - LIR Liberia

STLLIR

Lambert-St Louis

Sat 12/5

6:15 pm-2:17 pm

1 stop20h 02m

Liberia

Fri 12/11

3:35 pm-12:28 pm

2 stops20h 53m

$421

St. LouisLiberia

STL Lambert-St Louis - LIR Liberia

STLLIR

Lambert-St Louis

Mon 1/25

4:05 pm-2:10 pm

1 stop22h 05m

Liberia

Wed 1/27

3:10 pm-3:26 pm

1 stop24h 16m

$430

St. LouisSan José

STL Lambert-St Louis - SJO San José Juan Santamaria Intl

STLSJO

Lambert-St Louis

Tue 11/3

8:25 pm-1:15 pm

2 stops16h 50m

San José Juan Santamaria Intl

Tue 11/10

1:20 pm-10:25 pm

1 stop9h 05m

$516

St. LouisSan José

STL Lambert-St Louis - SJO San José Juan Santamaria Intl

STLSJO

Lambert-St Louis

Tue 11/3

8:25 pm-1:15 pm

2 stops16h 50m

San José Juan Santamaria Intl

Tue 11/10

1:20 pm-7:40 am

2 stops18h 20m

$516

St. LouisLiberia

STL Lambert-St Louis - LIR Liberia

STLLIR

Lambert-St Louis

Mon 10/26

6:15 am-12:10 pm

1 stop6h 55m

Liberia

Tue 10/27

4:20 pm-8:53 am

1 stop15h 33m

$518

St. LouisSan José

STL Lambert-St Louis - SJO San José Juan Santamaria Intl

STLSJO

Lambert-St Louis

Sun 11/1

6:15 am-1:22 pm

1 stop7h 07m

San José Juan Santamaria Intl

Fri 11/6

8:45 am-4:46 pm

1 stop8h 01m

$530

St. LouisSan José

STL Lambert-St Louis - SJO San José Juan Santamaria Intl

STLSJO

Lambert-St Louis

Sun 10/18

7:20 pm-12:00 pm

1 stop17h 40m

San José Juan Santamaria Intl

Tue 10/27

1:25 pm-11:54 pm

1 stop9h 29m

$530
Quickest round-trip

St. LouisSan José

STL Lambert-St Louis - SJO San José Juan Santamaria Intl

STLSJO

Lambert-St Louis

Sun 10/25

6:00 am-12:00 pm

1 stop7h 00m

San José Juan Santamaria Intl

Tue 11/3

2:25 pm-9:59 pm

1 stop7h 34m

$530

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Costa Rica from

How to get the cheapest flight ticket from St. Louis to Costa Rica

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Costa Rica?

The cheapest month to fly to Costa Rica from St. Louis is in October. Flight prices, which tend to average around $465, are often lower during this time because this is during the off-season. If you’re not able to fly to Costa Rica in October, then November is your next best option. Flight prices from St. Louis to Costa Rica during November average around $466.

How far in advance should I book a flight from St. Louis to Costa Rica?

You are more likely to see cheaper flights to Costa Rica from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Costa Rica for around $603 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Costa Rica from St. Louis for as low as $453 on momondo.

Can stopping save me money on St. Louis to Costa Rica flights?

You could potentially save up to 18% on your flight if you consider stops on a St. Louis to Costa Rica flight.

Cheap St. Louis to Costa Rica flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Costa Rica

Fastest flight time

6h 45m

Direct flights

None
The fastest flight from St. Louis to Costa Rica takes 6h 45m
There are no direct flights from St. Louis to Costa Rica. There are no popular flight routes from St. Louis to Costa Rica.
Search flight deals

Frequently asked questions about flying from St. Louis to Costa Rica

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Costa Rica?

    Prices for flights from Lambert-St Louis Airport to Costa Rica are refreshed on a daily basis.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Costa Rica?

  • How old do you have to be to fly from Lambert-St Louis Airport to Costa Rica?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Costa Rica.

  • What documentation or ID do you need to fly to Costa Rica?

    The travel and health documents required for your trip to Costa Rica can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Costa Rica. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from St. Louis to Costa Rica

Compare and see reviews for airlines that fly from St. Louis to Costa Rica with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $294Free CancellationRating
7.8
8,503 reviews
Search Delta flights
United AirlinesPriceFrom $334Free CancellationRating
7.4
10,101 reviews
Search United Airlines flights
American AirlinesPriceFrom $342Free CancellationRating
7.1
11,899 reviews
Search American Airlines flights
SouthwestPriceFrom $388Free CancellationRating
8.0
4,218 reviews
Search Southwest flights
GOLPriceFrom $628Free CancellationRating
7.3
1,272 reviews
Search GOL flights

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Costa Rica?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from St. Louis to Costa Rica for you.

Can I find flights from St. Louis to Costa Rica with flexible booking policies on momondo?

Flights from St. Louis to Costa Rica with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from St. Louis to Costa Rica?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to Costa Rica.

I’m not ready to book a flight from St. Louis to Costa Rica right now. Can momondo alert me if prices change?

Yes. momondo can track prices for St. Louis to Costa Rica flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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