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Cheap flights from St. Louis to Costa Rica from $179

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 11/7. 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.
United Airlines Logo
6:15 am - 1:10 pm
STL
-
LIR
6h 55m
1 stop
United Airlines Logo
2:20 pm - 10:06 pm
LIR
-
STL
7h 46m
1 stop
$360United Airlines
Mon, Dec 7 - Thu, Dec 10
American Airlines Logo
6:45 pm - 12:16 pm
STL
-
LIR
17h 31m
2 stops
American Airlines Logo
1:21 pm - 8:27 am
LIR
-
STL
19h 06m
2 stops
$365American Airlines
Sat, Nov 7 - Wed, Nov 11
American Airlines Logo
6:13 pm - 2:45 pm
STL
-
LIR
20h 32m
1 stop
American Airlines Logo
1:21 pm - 10:32 pm
LIR
-
STL
9h 11m
1 stop
$368American Airlines
Sat, Nov 7 - Wed, Nov 11
Delta Logo
6:00 am - 11:49 am
STL
-
SJO
6h 49m
1 stop
Delta Logo
1:14 pm - 11:58 pm
SJO
-
STL
9h 44m
1 stop
$400Delta
Sun, Aug 30 - Thu, Sep 3
American Airlines Logo
7:21 am - 8:07 pm
STL
-
SJO
13h 46m
2 stops
American Airlines Logo
6:00 am - 11:41 pm
SJO
-
STL
16h 41m
2 stops
$405American Airlines
Wed, Sep 9 - Thu, Sep 17
Frontier Logo
4:17 pm - 8:20 am
STL
-
SJO
17h 03m
1 stop
Frontier Logo
9:35 am - 11:59 pm
SJO
-
STL
13h 24m
1 stop
$468Frontier
Wed, Jul 1 - Thu, Jul 9
United Airlines Logo
6:15 am - 12:21 pm
STL
-
SJO
7h 06m
1 stop
United Airlines Logo
7:45 am - 10:06 pm
SJO
-
STL
13h 21m
1 stop
$469United Airlines
Sun, Oct 4 - Sun, Oct 25
Air Canada Logo
4:15 pm - 1:55 pm
STL
-
LIR
21h 40m
1 stop
Air Canada Logo
2:55 pm - 3:30 pm
LIR
-
STL
24h 35m
1 stop
$482Air Canada
Wed, Nov 4 - Sat, Nov 14
Air Canada Logo
4:15 pm - 1:55 pm
STL
-
LIR
21h 40m
1 stop
Air Canada Logo
2:40 pm - 3:30 pm
LIR
-
STL
24h 50m
2 stops
$485Air Canada
Wed, Nov 4 - Sat, Nov 14
Frontier Logo
4:17 pm - 8:20 am
STL
-
SJO
17h 03m
1 stop
Frontier Logo
9:35 am - 8:57 am
SJO
-
STL
22h 22m
2 stops
$499Frontier
Wed, Jul 1 - Thu, Jul 9

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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
Jul 1
STL4:17 pmLambert-St Louis
17h 03m
1 stop
SJO8:20 amSan José Juan Santamaria Intl
Jul 9
SJO9:35 amSan José Juan Santamaria Intl
13h 24m
1 stop
STL11:59 pmLambert-St Louis
$468
Frontier
Jul 1
STL4:17 pmLambert-St Louis
17h 03m
1 stop
SJO8:20 amSan José Juan Santamaria Intl
Jul 9
SJO9:35 amSan José Juan Santamaria Intl
22h 22m
2 stops
STL8:57 amLambert-St Louis
$499
Frontier
Jul 1
STL4:17 pmLambert-St Louis
17h 03m
1 stop
SJO8:20 amSan José Juan Santamaria Intl
Jul 9
SJO9:35 amSan José Juan Santamaria Intl
13h 24m
1 stop
STL11:59 pmLambert-St Louis
$538

United Airlines flights from St. Louis to Costa Rica

Our best United Airlines deals on St. Louis to Costa Rica flight tickets
United Airlines
Dec 7
STL6:15 amLambert-St Louis
6h 55m
1 stop
LIR1:10 pmLiberia
Dec 10
LIR2:20 pmLiberia
7h 46m
1 stop
STL10:06 pmLambert-St Louis
$360
United Airlines
Oct 4
STL6:15 amLambert-St Louis
7h 06m
1 stop
SJO12:21 pmSan José Juan Santamaria Intl
Oct 25
SJO7:45 amSan José Juan Santamaria Intl
13h 21m
1 stop
STL10:06 pmLambert-St Louis
$469
United Airlines
Oct 6
STL6:15 amLambert-St Louis
7h 06m
1 stop
SJO12:21 pmSan José Juan Santamaria Intl
Oct 11
SJO7:55 amSan José Juan Santamaria Intl
13h 35m
1 stop
STL10:30 pmLambert-St Louis
$496

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 June 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 12/7

6:15 am-1:10 pm

1 stop6h 55m

Liberia

Thu 12/10

2:20 pm-10:06 pm

1 stop7h 46m

$360

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Sat 11/7

6:45 pm-12:16 pm

2 stops17h 31m

Liberia

Wed 11/11

1:21 pm-8:27 am

2 stops19h 06m

$365

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Sat 11/7

6:13 pm-2:45 pm

1 stop20h 32m

Liberia

Wed 11/11

1:21 pm-10:32 pm

1 stop9h 11m

$368

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Sun 8/30

6:00 am-11:49 am

1 stop6h 49m

San José Juan Santamaria Intl

Thu 9/3

1:14 pm-11:58 pm

1 stop9h 44m

$400

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Wed 9/9

7:21 am-8:07 pm

2 stops13h 46m

San José Juan Santamaria Intl

Thu 9/17

6:00 am-11:41 pm

2 stops16h 41m

$405

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Wed 7/1

4:17 pm-8:20 am

1 stop17h 03m

San José Juan Santamaria Intl

Thu 7/9

9:35 am-11:59 pm

1 stop13h 24m

$468

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Sun 10/4

6:15 am-12:21 pm

1 stop7h 06m

San José Juan Santamaria Intl

Sun 10/25

7:45 am-10:06 pm

1 stop13h 21m

$469

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Wed 11/4

4:15 pm-1:55 pm

1 stop21h 40m

Liberia

Sat 11/14

2:55 pm-3:30 pm

1 stop24h 35m

$482

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Wed 11/4

4:15 pm-1:55 pm

1 stop21h 40m

Liberia

Sat 11/14

2:40 pm-3:30 pm

2 stops24h 50m

$485

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Wed 7/1

4:17 pm-8:20 am

1 stop17h 03m

San José Juan Santamaria Intl

Thu 7/9

9:35 am-8:57 am

2 stops22h 22m

$499

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 November is your next best option. Flight prices from St. Louis to Costa Rica during November average around $264.

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 $564 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 56% 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 32m

Direct flights

None
The fastest flight from St. Louis to Costa Rica takes 6h 32m
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
7.9
8,394 reviews
Search Delta flights
American AirlinesPriceFrom $314Free CancellationRating
7.1
11,639 reviews
Search American Airlines flights
United AirlinesPriceFrom $327Free CancellationRating
7.4
9,801 reviews
Search United Airlines flights
SouthwestPriceFrom $383Free CancellationRating
7.9
4,238 reviews
Search Southwest flights
GOLPriceFrom $644Free CancellationRating
7.3
1,226 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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