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Cheap flights from St. Louis to Costa Rica from $160

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 4/13. 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.
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
$326Delta
Mon, May 4 - Wed, May 13
American Airlines Logo
6:55 pm - 1:40 pm
STL
-
LIR
19h 45m
2 stops
American Airlines Logo
12:28 pm - 8:54 am
LIR
-
STL
19h 26m
2 stops
$331American Airlines
Mon, May 4 - Wed, May 13
United Airlines Logo
6:00 am - 2:25 pm
STL
-
LIR
9h 25m
1 stop
United Airlines Logo
3:27 pm - 9:25 am
LIR
-
STL
16h 58m
1 stop
$345United Airlines
Mon, Apr 20 - Mon, Apr 27
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
$346Delta
Mon, May 4 - Wed, May 13
United Airlines Logo
8:15 pm - 12:10 pm
STL
-
LIR
16h 55m
2 stops
United Airlines Logo
3:27 pm - 8:25 am
LIR
-
STL
15h 58m
2 stops
$350United Airlines
Mon, Apr 20 - Mon, Apr 27
American Airlines Logo
7:12 am - 1:40 pm
STL
-
LIR
7h 28m
1 stop
American Airlines Logo
2:40 pm - 10:16 am
LIR
-
STL
18h 36m
1 stop
$355American Airlines
Mon, Apr 20 - Mon, Apr 27
American Airlines Logo
5:24 am - 7:07 pm
STL
-
SJO
14h 43m
1 stop
American Airlines Logo
11:35 pm - 6:30 pm
SJO
-
STL
17h 55m
1 stop
$362American Airlines
Wed, Apr 29 - Wed, May 20
American Airlines Logo
5:51 am - 7:07 pm
STL
-
SJO
14h 16m
2 stops
American Airlines Logo
11:35 pm - 8:54 am
SJO
-
STL
8h 19m
1 stop
$365American Airlines
Mon, May 11 - Fri, May 15
American Airlines Logo
5:51 am - 7:07 pm
STL
-
SJO
14h 16m
2 stops
American Airlines Logo
6:30 am - 10:19 pm
SJO
-
STL
14h 49m
2 stops
$367American Airlines
Wed, Apr 29 - Wed, May 20
Frontier Logo
4:44 pm - 8:45 am
STL
-
SJO
17h 01m
1 stop
Frontier Logo
10:00 am - 11:57 pm
SJO
-
STL
12h 57m
1 stop
$378Frontier
Sun, May 24 - Fri, May 29

Frontier flights from St. Louis to Costa Rica

Our best Frontier deals on St. Louis to Costa Rica flight tickets
Frontier
May 24
STL4:44 pmLambert-St Louis
17h 01m
1 stop
SJO8:45 amSan José Juan Santamaria Intl
May 29
SJO10:00 amSan José Juan Santamaria Intl
12h 57m
1 stop
STL11:57 pmLambert-St Louis
$378
Frontier
May 23
STL8:08 pmLambert-St Louis
13h 37m
2 stops
SJO8:45 amSan José Juan Santamaria Intl
May 31
SJO10:00 amSan José Juan Santamaria Intl
12h 57m
1 stop
STL11:57 pmLambert-St Louis
$416
Frontier
May 21
STL4:44 pmLambert-St Louis
17h 01m
1 stop
SJO8:45 amSan José Juan Santamaria Intl
May 31
SJO10:00 amSan José Juan Santamaria Intl
12h 57m
1 stop
STL11:57 pmLambert-St Louis
$418

United Airlines flights from St. Louis to Costa Rica

Our best United Airlines deals on St. Louis to Costa Rica flight tickets
United Airlines
Apr 20
STL6:00 amLambert-St Louis
9h 25m
1 stop
LIR2:25 pmLiberia
Apr 27
LIR3:27 pmLiberia
16h 58m
1 stop
STL9:25 amLambert-St Louis
$345
United Airlines
Apr 20
STL8:15 pmLambert-St Louis
16h 55m
2 stops
LIR12:10 pmLiberia
Apr 27
LIR3:27 pmLiberia
15h 58m
2 stops
STL8:25 amLambert-St Louis
$350
United Airlines
Apr 21
STL6:00 amLambert-St Louis
7h 10m
1 stop
LIR12:10 pmLiberia
Apr 25
LIR3:27 pmLiberia
16h 58m
1 stop
STL9:25 amLambert-St Louis
$377

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 March 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
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

$326

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Mon 5/4

6:55 pm-1:40 pm

2 stops19h 45m

Liberia

Wed 5/13

12:28 pm-8:54 am

2 stops19h 26m

$331

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Mon 4/20

6:00 am-2:25 pm

1 stop9h 25m

Liberia

Mon 4/27

3:27 pm-9:25 am

1 stop16h 58m

$345

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

$346

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Mon 4/20

8:15 pm-12:10 pm

2 stops16h 55m

Liberia

Mon 4/27

3:27 pm-8:25 am

2 stops15h 58m

$350

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Mon 4/20

7:12 am-1:40 pm

1 stop7h 28m

Liberia

Mon 4/27

2:40 pm-10:16 am

1 stop18h 36m

$355

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Wed 4/29

5:24 am-7:07 pm

1 stop14h 43m

San José Juan Santamaria Intl

Wed 5/20

11:35 pm-6:30 pm

1 stop17h 55m

$362

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Mon 5/11

5:51 am-7:07 pm

2 stops14h 16m

San José Juan Santamaria Intl

Fri 5/15

11:35 pm-8:54 am

1 stop8h 19m

$365

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Wed 4/29

5:51 am-7:07 pm

2 stops14h 16m

San José Juan Santamaria Intl

Wed 5/20

6:30 am-10:19 pm

2 stops14h 49m

$367

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Sun 5/24

4:44 pm-8:45 am

1 stop17h 01m

San José Juan Santamaria Intl

Fri 5/29

10:00 am-11:57 pm

1 stop12h 57m

$378

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 January. Flight prices, which tend to average around $403, are often lower during this time because this is during the off-season. If you’re not able to fly to Costa Rica in January, then October is your next best option. Flight prices from St. Louis to Costa Rica during October average around $413.

How far in advance should I book a flight 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 $555 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 $412 on momondo.

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

You could potentially save up to 7% 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 50m

Direct flights

None
The fastest flight from St. Louis to Costa Rica takes 6h 50m
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

  • 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 $241Free CancellationRating
7.9
8,276 reviews
Search Delta flights
American AirlinesPriceFrom $314Free CancellationRating
7.1
11,414 reviews
Search American Airlines flights
United AirlinesPriceFrom $327Free CancellationRating
7.4
9,409 reviews
Search United Airlines flights
SouthwestPriceFrom $383Free CancellationRating
8.0
4,317 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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