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Cheap flights from St. Louis to Costa Rica from $152

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 8/15. 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
0 bags

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Find the cheapest flights from St. Louis to Costa Rica

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
4:19 pm - 8:19 am
STL
-
SJO
17h 00m
1 stop
Frontier Logo
9:35 am - 12:09 am
SJO
-
STL
13h 34m
1 stop
$358Frontier
Sat, Jun 6 - Thu, Jun 11
Frontier Logo
4:19 pm - 8:19 am
STL
-
SJO
17h 00m
1 stop
Frontier Logo
9:35 am - 12:09 am
SJO
-
STL
13h 34m
1 stop
$368Frontier
Sat, Jun 6 - Thu, Jun 11
Frontier Logo
4:10 pm - 8:20 am
STL
-
SJO
17h 10m
1 stop
Frontier Logo
9:35 am - 12:14 am
SJO
-
STL
13h 39m
1 stop
$369Frontier
Sun, Aug 30 - Thu, Sep 3
Frontier Logo
4:17 pm - 8:20 am
STL
-
SJO
17h 03m
1 stop
Frontier Logo
9:35 am - 12:09 am
SJO
-
STL
13h 34m
1 stop
$378Frontier
Wed, Jun 24 - Sun, Jun 28
American Airlines Logo
6:03 am - 7:52 pm
STL
-
SJO
14h 49m
2 stops
American Airlines Logo
6:00 am - 11:23 pm
SJO
-
STL
16h 23m
2 stops
$395American Airlines
Sun, Aug 30 - Thu, Sep 3
United Airlines Logo
11:25 am - 10:39 pm
STL
-
SJO
12h 14m
2 stops
United Airlines Logo
12:30 am - 10:07 am
SJO
-
STL
8h 37m
1 stop
$396United Airlines
Wed, May 27 - Tue, Jun 2
Multiple Airlines Logo
5:27 pm - 11:45 am
STL
-
SJO
19h 18m
2 stops
Multiple Airlines Logo
9:35 am - 12:09 am
SJO
-
STL
13h 34m
1 stop
$400Multiple Airlines
Sat, Jun 6 - Thu, Jun 11
American Airlines Logo
6:03 am - 7:52 pm
STL
-
SJO
14h 49m
2 stops
American Airlines Logo
6:00 am - 11:23 pm
SJO
-
STL
16h 23m
2 stops
$401American Airlines
Sun, Aug 30 - Thu, Sep 3
United Airlines Logo
6:24 pm - 9:50 am
STL
-
LIR
16h 26m
1 stop
United Airlines Logo
11:10 am - 8:42 pm
LIR
-
STL
8h 32m
1 stop
$441United Airlines
Mon, May 25 - Fri, May 29
Delta Logo
6:00 am - 12:00 pm
STL
-
LIR
7h 00m
1 stop
Delta Logo
1:25 pm - 11:59 pm
LIR
-
STL
9h 34m
1 stop
$472Delta
Mon, May 4 - Wed, May 13

American Airlines flights from St. Louis to Costa Rica

Our best American Airlines deals on St. Louis to Costa Rica flight tickets
American Airlines
Aug 30
STL6:03 amLambert-St Louis
14h 49m
2 stops
SJO7:52 pmSan José Juan Santamaria Intl
Sep 3
SJO6:00 amSan José Juan Santamaria Intl
16h 23m
2 stops
STL11:23 pmLambert-St Louis
$395
American Airlines
Aug 30
STL6:03 amLambert-St Louis
14h 49m
2 stops
SJO7:52 pmSan José Juan Santamaria Intl
Sep 3
SJO6:00 amSan José Juan Santamaria Intl
16h 23m
2 stops
STL11:23 pmLambert-St Louis
$401
American Airlines
Oct 12
STL4:51 pmLambert-St Louis
19h 14m
2 stops
LIR11:05 amLiberia
Oct 19
LIR2:10 pmLiberia
18h 17m
1 stop
STL9:27 amLambert-St Louis
$407

Frontier flights from St. Louis to Costa Rica

Our best Frontier deals on St. Louis to Costa Rica flight tickets
Frontier
Jun 6
STL4:19 pmLambert-St Louis
17h 00m
1 stop
SJO8:19 amSan José Juan Santamaria Intl
Jun 11
SJO9:35 amSan José Juan Santamaria Intl
13h 34m
1 stop
STL12:09 amLambert-St Louis
$358
Frontier
Jun 6
STL4:19 pmLambert-St Louis
17h 00m
1 stop
SJO8:19 amSan José Juan Santamaria Intl
Jun 11
SJO9:35 amSan José Juan Santamaria Intl
13h 34m
1 stop
STL12:09 amLambert-St Louis
$368
Frontier
Aug 30
STL4:10 pmLambert-St Louis
17h 10m
1 stop
SJO8:20 amSan José Juan Santamaria Intl
Sep 3
SJO9:35 amSan José Juan Santamaria Intl
13h 39m
1 stop
STL12:14 amLambert-St Louis
$369

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 April 29, 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. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Sat 6/6

4:19 pm-8:19 am

1 stop17h 00m

San José Juan Santamaria Intl

Thu 6/11

9:35 am-12:09 am

1 stop13h 34m

$358

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Sat 6/6

4:19 pm-8:19 am

1 stop17h 00m

San José Juan Santamaria Intl

Thu 6/11

9:35 am-12:09 am

1 stop13h 34m

$368

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Sun 8/30

4:10 pm-8:20 am

1 stop17h 10m

San José Juan Santamaria Intl

Thu 9/3

9:35 am-12:14 am

1 stop13h 39m

$369

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Wed 6/24

4:17 pm-8:20 am

1 stop17h 03m

San José Juan Santamaria Intl

Sun 6/28

9:35 am-12:09 am

1 stop13h 34m

$378

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Sun 8/30

6:03 am-7:52 pm

2 stops14h 49m

San José Juan Santamaria Intl

Thu 9/3

6:00 am-11:23 pm

2 stops16h 23m

$395

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Wed 5/27

11:25 am-10:39 pm

2 stops12h 14m

San José Juan Santamaria Intl

Tue 6/2

12:30 am-10:07 am

1 stop8h 37m

$396

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Sat 6/6

5:27 pm-11:45 am

2 stops19h 18m

San José Juan Santamaria Intl

Thu 6/11

9:35 am-12:09 am

1 stop13h 34m

$400

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Sun 8/30

6:03 am-7:52 pm

2 stops14h 49m

San José Juan Santamaria Intl

Thu 9/3

6:00 am-11:23 pm

2 stops16h 23m

$401

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Mon 5/25

6:24 pm-9:50 am

1 stop16h 26m

Liberia

Fri 5/29

11:10 am-8:42 pm

1 stop8h 32m

$441
Quickest round-trip

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Mon 5/4

6:00 am-12:00 pm

1 stop7h 00m

Liberia

Wed 5/13

1:25 pm-11:59 pm

1 stop9h 34m

$472

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 August. Flight prices, which tend to average around $131, are often lower during this time because this is during the off-season. If you’re not able to fly to Costa Rica in August, then February is your next best option. Flight prices from St. Louis to Costa Rica during February average around $257.

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 $556 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 $403 on momondo.

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

You could potentially save up to 1% 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 51m

Direct flights

None
The fastest flight from St. Louis to Costa Rica takes 6h 51m
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 $257Free CancellationRating
7.9
8,466 reviews
Search Delta flights
American AirlinesPriceFrom $314Free CancellationRating
7.1
11,678 reviews
Search American Airlines flights
United AirlinesPriceFrom $327Free CancellationRating
7.4
9,680 reviews
Search United Airlines flights
SouthwestPriceFrom $383Free CancellationRating
8.0
4,314 reviews
Search Southwest 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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