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Cheap flights from St. Louis to Costa Rica from $141

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 11/20. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap round-trip flights

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Spirit Airlines Logo
12:20 pm - 12:21 amSTL-SJO
12h 01m1 stop
Spirit Airlines Logo
1:19 pm - 11:01 amSJO-STL
21h 42m1 stop
$307Spirit Airlines
Find Deal
Thu, Jan 22 - Wed, Jan 28
Multiple Airlines Logo
12:20 pm - 12:21 amSTL-SJO
12h 01m1 stop
Multiple Airlines Logo
1:16 am - 10:33 pmSJO-STL
21h 17m2 stops
$327Multiple Airlines
Find Deal
Thu, Jan 22 - Tue, Jan 27
Spirit Airlines Logo
11:51 am - 12:25 pmSTL-SJO
24h 34m1 stop
Spirit Airlines Logo
1:19 pm - 11:01 amSJO-STL
21h 42m1 stop
$330Spirit Airlines
Find Deal
Tue, Dec 30 - Wed, Jan 21
Delta Logo
6:00 am - 12:50 pmSTL-LIR
6h 50m1 stop
Delta Logo
2:45 pm - 11:25 pmLIR-STL
8h 40m1 stop
$349Delta
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Fri, Jan 9 - Thu, Jan 15
American Airlines Logo
6:00 am - 2:20 pmSTL-LIR
8h 20m1 stop
American Airlines Logo
3:13 pm - 9:40 amLIR-STL
18h 27m2 stops
$353American Airlines
Find Deal
Fri, Jan 9 - Thu, Jan 15
American Airlines Logo
5:59 pm - 12:37 pmSTL-LIR
18h 38m2 stops
American Airlines Logo
3:13 pm - 11:05 amLIR-STL
19h 52m2 stops
$358American Airlines
Find Deal
Thu, Jan 22 - Sun, Jan 25
Delta Logo
7:05 am - 10:07 pmSTL-SJO
15h 02m1 stop
Delta Logo
7:00 am - 6:35 pmSJO-STL
11h 35m1 stop
$388Delta
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Tue, Nov 18 - Tue, Nov 25
United Airlines Logo
5:20 am - 3:25 pmSTL-LIR
11h 05m1 stop
United Airlines Logo
1:20 pm - 10:06 pmLIR-STL
7h 46m1 stop
$443United Airlines
Find Deal
Fri, May 1 - Sun, May 10
United Airlines Logo
6:00 am - 1:10 pmSTL-LIR
7h 10m1 stop
United Airlines Logo
8:35 am - 10:00 pmLIR-STL
13h 25m1 stop
$506United Airlines
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Thu, Feb 5 - Sun, Feb 8
Southwest Logo
6:00 pm - 11:35 amSTL-LIR
18h 35m2 stops
Southwest Logo
12:35 pm - 11:15 pmLIR-STL
9h 40m1 stop
$1,328Southwest
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Sat, Mar 14 - Sat, Mar 21

Copa Airlines flights from St. Louis to Costa Rica

Our best Copa Airlines deals on St. Louis to Costa Rica flight tickets
Copa Airlines
Nov 12
STL8:25 amLambert-St Louis
13h 31m
2 stops
SJO9:56 pmSan José Juan Santamaria Intl
Nov 18
SJO4:08 amSan José Juan Santamaria Intl
13h 31m
2 stops
STL5:39 pmLambert-St Louis
$777
Find similar
Copa Airlines
Nov 8
STL8:00 amLambert-St Louis
13h 56m
2 stops
SJO9:56 pmSan José Juan Santamaria Intl
Nov 12
SJO4:08 amSan José Juan Santamaria Intl
15h 08m
2 stops
STL7:16 pmLambert-St Louis
$972
Find similar
Copa Airlines
Nov 17
STL8:25 amLambert-St Louis
23h 08m
2 stops
SJO7:33 amSan José Juan Santamaria Intl
Nov 24
SJO4:08 amSan José Juan Santamaria Intl
15h 31m
2 stops
STL7:39 pmLambert-St Louis
$1,023
Find similar

Alaska Airlines flights from St. Louis to Costa Rica

Our best Alaska Airlines deals on St. Louis to Costa Rica flight tickets
Alaska Airlines
Nov 7
STL4:14 pmLambert-St Louis
32h 24m
2 stops
SJO12:38 amSan José Juan Santamaria Intl
Nov 9
SJO1:55 amSan José Juan Santamaria Intl
22h 04m
2 stops
STL11:59 pmLambert-St Louis
$930
Find similar
Alaska Airlines
Mar 14
STL7:00 amLambert-St Louis
24h 20m
2 stops
LIR6:20 amLiberia
Mar 21
LIR5:45 pmLiberia
29h 10m
2 stops
STL11:55 pmLambert-St Louis
$1,234
Find similar
Alaska Airlines
Nov 4
STL7:00 amLambert-St Louis
17h 38m
2 stops
SJO12:38 amSan José Juan Santamaria Intl
Nov 5
SJO1:55 amSan José Juan Santamaria Intl
22h 04m
2 stops
STL11:59 pmLambert-St Louis
$4,682
Find similar

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 November 3, 2025.
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

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Thu 1/22

12:20 pm-12:21 am

1 stop12h 01m

San José Juan Santamaria Intl

Wed 1/28

1:19 pm-11:01 am

1 stop21h 42m

$307

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Thu 1/22

12:20 pm-12:21 am

1 stop12h 01m

San José Juan Santamaria Intl

Tue 1/27

1:16 am-10:33 pm

2 stops21h 17m

$327

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Tue 12/30

11:51 am-12:25 pm

1 stop24h 34m

San José Juan Santamaria Intl

Wed 1/21

1:19 pm-11:01 am

1 stop21h 42m

$330

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Fri 1/9

6:00 am-12:50 pm

1 stop6h 50m

Liberia

Thu 1/15

2:45 pm-11:25 pm

1 stop8h 40m

$349

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Fri 1/9

6:00 am-2:20 pm

1 stop8h 20m

Liberia

Thu 1/15

3:13 pm-9:40 am

2 stops18h 27m

$353

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Thu 1/22

5:59 pm-12:37 pm

2 stops18h 38m

Liberia

Sun 1/25

3:13 pm-11:05 am

2 stops19h 52m

$358

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Tue 11/18

7:05 am-10:07 pm

1 stop15h 02m

San José Juan Santamaria Intl

Tue 11/25

7:00 am-6:35 pm

1 stop11h 35m

$388

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Fri 5/1

5:20 am-3:25 pm

1 stop11h 05m

Liberia

Sun 5/10

1:20 pm-10:06 pm

1 stop7h 46m

$443

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Thu 2/5

6:00 am-1:10 pm

1 stop7h 10m

Liberia

Sun 2/8

8:35 am-10:00 pm

1 stop13h 25m

$506

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Sat 3/14

6:00 pm-11:35 am

2 stops18h 35m

Liberia

Sat 3/21

12:35 pm-11:15 pm

1 stop9h 40m

$1,328

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 September. Flight prices, which tend to average around $435, are often lower during this time because this is during the off-season. If you’re not able to fly to Costa Rica in September, then October is your next best option. Flight prices from St. Louis to Costa Rica during October average around $439.

What is the cheapest day to depart on your flight to Costa Rica?

According to our data, Tuesday is the cheapest day to fly to Costa Rica from St. Louis. The lowest ticket price found for a Tuesday departure recently was $519. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $687. These prices are subject to change though, so be sure to set up a Price Alert for flights to Costa Rica.

What is the cheapest time of day to depart on your flight to Costa Rica?

In the evening is the cheapest time of day to fly from St. Louis to Costa Rica when you can find flight prices for as low as $427. Flying to Costa Rica in the evening is an ideal time because this is during off-peak travel hours. Flights to Costa Rica are more costly at noon, with an average ticket price of $604. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

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 $595 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 $472 on momondo.

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

You could potentially save up to 15% 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

Direct flights

None
There are no direct flights from St. Louis to Costa Rica. There are no popular flight routes from St. Louis to Costa Rica.
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  • 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
8,002 reviews
Search Delta flights
Spirit AirlinesPriceFrom $263Free CancellationRating
6.3
8,115 reviews
Search Spirit Airlines flights
United AirlinesPriceFrom $334Free CancellationRating
7.4
8,997 reviews
Search United Airlines flights
American AirlinesPriceFrom $337Free CancellationRating
7.2
11,038 reviews
Search American Airlines flights
SouthwestPriceFrom $383Free CancellationRating
8.0
4,238 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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