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Cheap flights from St. Louis to Costa Rica from $130

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 12/6. 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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0 bags

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Find the cheapest flights from St. Louis to Costa Rica

Cheap round-trip flights

United Airlines Logo
6:45 am - 6:37 pmSTL-LIR
11h 52m2 stops
United Airlines Logo
2:14 pm - 10:06 pmLIR-STL
7h 52m1 stop
$315United Airlines
Find Deal
Tue, Mar 3 - Thu, Mar 5
United Airlines Logo
8:20 am - 5:37 pmSTL-LIR
10h 17m1 stop
United Airlines Logo
2:20 pm - 10:22 pmLIR-STL
8h 02m1 stop
$317United Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
American Airlines Logo
7:59 pm - 11:49 amSTL-LIR
16h 50m2 stops
American Airlines Logo
2:02 pm - 9:26 amLIR-STL
18h 24m2 stops
$319American Airlines
Find Deal
Mon, Sep 29 - Fri, Oct 3
American Airlines Logo
5:11 am - 12:59 pmSTL-LIR
8h 48m1 stop
American Airlines Logo
1:21 pm - 8:57 amLIR-STL
19h 36m2 stops
$321American Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
Spirit Airlines Logo
12:20 pm - 12:21 amSTL-SJO
12h 01m1 stop
Spirit Airlines Logo
1:16 am - 11:01 amSJO-STL
9h 45m1 stop
$344Spirit Airlines
Find Deal
Thu, Dec 4 - Wed, Dec 10
Spirit Airlines Logo
2:48 pm - 12:21 amSTL-SJO
9h 33m1 stop
Spirit Airlines Logo
1:16 am - 11:01 amSJO-STL
9h 45m1 stop
$357Spirit Airlines
Find Deal
Sat, Jan 31 - Wed, Feb 4
Delta Logo
11:44 am - 10:07 pmSTL-SJO
10h 23m1 stop
Delta Logo
2:31 pm - 9:58 pmSJO-STL
7h 27m1 stop
$360Delta
Find Deal
Tue, Nov 18 - Tue, Nov 25
Southwest Logo
5:30 am - 12:05 pmSTL-SJO
7h 35m1 stop
Southwest Logo
12:55 pm - 10:25 pmSJO-STL
8h 30m1 stop
$361Southwest
Find Deal
Tue, Oct 14 - Fri, Oct 17
Delta Logo
3:15 pm - 10:07 pmSTL-SJO
6h 52m1 stop
Delta Logo
7:00 am - 9:03 pmSJO-STL
14h 03m1 stop
$380Delta
Find Deal
Thu, Nov 27 - Fri, Dec 5
Southwest Logo
5:05 am - 11:40 amSTL-SJO
7h 35m1 stop
Southwest Logo
1:05 pm - 12:05 amSJO-STL
10h 00m1 stop
$381Southwest
Find Deal
Wed, Oct 22 - Sun, Oct 26

Delta flights from St. Louis to Costa Rica

Our best Delta deals on St. Louis to Costa Rica flight tickets
Delta
Sep 29
STL6:01 amLambert-St Louis
6h 59m
1 stop
LIR12:00 pmLiberia
Oct 3
LIR1:25 pmLiberia
8h 59m
1 stop
STL11:24 pmLambert-St Louis
$315
Find similar
Delta
Nov 18
STL11:44 amLambert-St Louis
10h 23m
1 stop
SJO10:07 pmSan José Juan Santamaria Intl
Nov 25
SJO2:31 pmSan José Juan Santamaria Intl
7h 27m
1 stop
STL9:58 pmLambert-St Louis
$360
Find similar
Delta
Nov 27
STL3:15 pmLambert-St Louis
6h 52m
1 stop
SJO10:07 pmSan José Juan Santamaria Intl
Dec 5
SJO7:00 amSan José Juan Santamaria Intl
14h 03m
1 stop
STL9:03 pmLambert-St Louis
$380
Find similar

Southwest flights from St. Louis to Costa Rica

Our best Southwest deals on St. Louis to Costa Rica flight tickets
Southwest
Oct 14
STL5:30 amLambert-St Louis
7h 35m
1 stop
SJO12:05 pmSan José Juan Santamaria Intl
Oct 17
SJO12:55 pmSan José Juan Santamaria Intl
8h 30m
1 stop
STL10:25 pmLambert-St Louis
$361
Find similar
Southwest
Oct 22
STL5:05 amLambert-St Louis
7h 35m
1 stop
SJO11:40 amSan José Juan Santamaria Intl
Oct 26
SJO1:05 pmSan José Juan Santamaria Intl
10h 00m
1 stop
STL12:05 amLambert-St Louis
$381
Find similar
Southwest
Oct 22
STL8:45 pmLambert-St Louis
16h 50m
2 stops
SJO12:35 pmSan José Juan Santamaria Intl
Oct 26
SJO1:05 pmSan José Juan Santamaria Intl
10h 00m
1 stop
STL12:05 amLambert-St Louis
$385
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 September 16, 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. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Tue 3/3

6:45 am-6:37 pm

2 stops11h 52m

Liberia

Thu 3/5

2:14 pm-10:06 pm

1 stop7h 52m

$315

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Thu 10/30

8:20 am-5:37 pm

1 stop10h 17m

Liberia

Thu 11/6

2:20 pm-10:22 pm

1 stop8h 02m

$317

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Mon 9/29

7:59 pm-11:49 am

2 stops16h 50m

Liberia

Fri 10/3

2:02 pm-9:26 am

2 stops18h 24m

$319

St. LouisLiberia

STL - LIR

STLLIR

Lambert-St Louis

Thu 10/30

5:11 am-12:59 pm

1 stop8h 48m

Liberia

Thu 11/6

1:21 pm-8:57 am

2 stops19h 36m

$321

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Thu 12/4

12:20 pm-12:21 am

1 stop12h 01m

San José Juan Santamaria Intl

Wed 12/10

1:16 am-11:01 am

1 stop9h 45m

$344

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Sat 1/31

2:48 pm-12:21 am

1 stop9h 33m

San José Juan Santamaria Intl

Wed 2/4

1:16 am-11:01 am

1 stop9h 45m

$357

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Tue 11/18

11:44 am-10:07 pm

1 stop10h 23m

San José Juan Santamaria Intl

Tue 11/25

2:31 pm-9:58 pm

1 stop7h 27m

$360

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Tue 10/14

5:30 am-12:05 pm

1 stop7h 35m

San José Juan Santamaria Intl

Fri 10/17

12:55 pm-10:25 pm

1 stop8h 30m

$361

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Thu 11/27

3:15 pm-10:07 pm

1 stop6h 52m

San José Juan Santamaria Intl

Fri 12/5

7:00 am-9:03 pm

1 stop14h 03m

$380

St. LouisSan José

STL - SJO

STLSJO

Lambert-St Louis

Wed 10/22

5:05 am-11:40 am

1 stop7h 35m

San José Juan Santamaria Intl

Sun 10/26

1:05 pm-12:05 am

1 stop10h 00m

$381

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 $446, 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 $490.

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 $592 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 $507 on momondo.

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
7,954 reviews
Search Delta flights
Spirit AirlinesPriceFrom $263Free CancellationRating
6.3
8,015 reviews
Search Spirit Airlines flights
United AirlinesPriceFrom $334Free CancellationRating
7.4
8,929 reviews
Search United Airlines flights
American AirlinesPriceFrom $354Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $393Free CancellationRating
8.0
4,242 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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