$159+ Cheap flights from St. Louis (STL) to Costa Rica
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/11. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SJO
Mar 10 — Mar 171
1 adult, Economy
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Find cheap flights from St. Louis to Costa Rica with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from St. Louis to Costa Rica
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Cheapest flights from St. Louis to Costa RicaExplore the most affordable flight options available from St. Louis to Costa Rica. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 8, 2026.
Explore the most affordable flight options available from St. Louis to Costa Rica. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 8, 2026.
This American Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/216:53 pm
STL
- LIR
2 stops17h 17m
American Airlines
Fri 2/273:13 pm
LIR
- STL
1 stop8h 43m
American Airlines
Deal found 2/7![American Airlines logo]()
$322
This American Airlines deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/217:12 am
STL
- LIR
1 stop7h 28m
American Airlines
Tue 4/282:10 pm
LIR
- STL
1 stop17h 44m
American Airlines
Deal found 2/5![American Airlines logo]()
$328
This Delta deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/237:10 am
STL
- LIR
1 stop7h 05m
Delta
Thu 3/52:45 pm
LIR
- STL
1 stop8h 38m
Delta
Deal found 2/7![Delta logo]()
$330
This American Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/234:13 pm
STL
- LIR
2 stops19h 57m
American Airlines
Thu 3/53:13 pm
LIR
- STL
2 stops17h 22m
American Airlines
Deal found 2/7![American Airlines logo]()
$335
This American Airlines deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/268:03 pm
STL
- LIR
2 stops16h 21m
American Airlines
Fri 5/112:29 pm
LIR
- STL
1 stop8h 55m
American Airlines
Deal found 2/6![American Airlines logo]()
$340
This American Airlines deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/45:20 am
STL
- LIR
1 stop9h 20m
American Airlines
Wed 5/1312:29 pm
LIR
- STL
1 stop8h 55m
American Airlines
Deal found 2/5![American Airlines logo]()
$342
This United Airlines deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/276:00 am
STL
- LIR
1 stop7h 10m
United Airlines
Thu 3/52:01 pm
LIR
- STL
1 stop8h 58m
United Airlines
Deal found 2/5![United Airlines logo]()
$348
This American Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/246:20 pm
STL
- LIR
1 stop17h 53m
American Airlines
Tue 3/312:18 pm
LIR
- STL
1 stop19h 14m
American Airlines
Deal found 2/7![American Airlines logo]()
$351
This Kiwi.com deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/61:09 pm
STL
- SJO
2 stops45h 31m
Multiple Airlines
Wed 3/1111:35 am
SJO
- STL
1 stop10h 44m
Multiple Airlines
Deal found 2/6![Multiple Airlines logo]()
$352
This American Airlines deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/276:36 pm
STL
- LIR
2 stops17h 56m
American Airlines
Wed 3/43:32 pm
LIR
- STL
1 stop7h 50m
American Airlines
Deal found 2/5![American Airlines logo]()
$360
This American Airlines deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/166:53 pm
STL
- SJO
1 stop17h 32m
American Airlines
Thu 5/2111:59 pm
SJO
- STL
1 stop15h 34m
American Airlines
Deal found 2/5![American Airlines logo]()
$360
This Southwest deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/1312:25 pm
STL
- SJO
1 stop7h 35m
Southwest
Fri 4/171:10 pm
SJO
- STL
1 stop9h 45m
Southwest
Deal found 2/7![Southwest logo]()
$361
Best flights from St. Louis to Costa RicaDiscover carefully curated flight deals from St. Louis to Costa Rica that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 8, 2026.
Discover carefully curated flight deals from St. Louis to Costa Rica that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 8, 2026.
This American Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/216:53 pm
STL
- LIR
1 stop17h 30m
American Airlines
Fri 2/272:32 pm
LIR
- STL
1 stop9h 03m
American Airlines
Deal found 2/7![American Airlines logo]()
$322
This Delta deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/237:10 am
STL
- LIR
1 stop7h 05m
Delta
Thu 3/52:45 pm
LIR
- STL
1 stop8h 38m
Delta
Deal found 2/7![Delta logo]()
$330
This Kiwi.com deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/61:09 pm
STL
- SJO
2 stops45h 31m
Multiple Airlines
Wed 3/1111:35 am
SJO
- STL
1 stop10h 44m
Multiple Airlines
Deal found 2/6![Multiple Airlines logo]()
$352
This Southwest deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/1312:25 pm
STL
- SJO
1 stop7h 35m
Southwest
Fri 4/171:10 pm
SJO
- STL
1 stop9h 45m
Southwest
Deal found 2/7![Southwest logo]()
$361
This American Airlines deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/217:12 am
STL
- LIR
1 stop7h 28m
American Airlines
Tue 4/282:10 pm
LIR
- STL
1 stop17h 44m
American Airlines
Deal found 2/5![American Airlines logo]()
$328
This American Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/234:13 pm
STL
- LIR
2 stops19h 57m
American Airlines
Thu 3/53:13 pm
LIR
- STL
2 stops17h 22m
American Airlines
Deal found 2/7![American Airlines logo]()
$335
This Delta deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/411:55 am
STL
- SJO
1 stop10h 07m
Delta
Sat 3/73:46 pm
SJO
- STL
1 stop7h 50m
Delta
Deal found 2/6![Delta logo]()
$385
This American Airlines deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:55 pm
STL
- LIR
2 stops17h 29m
American Airlines
Mon 4/202:10 pm
LIR
- STL
1 stop17h 44m
American Airlines
Deal found 2/5![American Airlines logo]()
$340
This American Airlines deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/265:20 am
STL
- LIR
1 stop9h 20m
American Airlines
Fri 5/112:28 pm
LIR
- STL
2 stops18h 56m
American Airlines
Deal found 2/5![American Airlines logo]()
$340
This American Airlines deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/45:24 am
STL
- LIR
1 stop8h 46m
American Airlines
Wed 5/1312:29 pm
LIR
- STL
1 stop8h 55m
American Airlines
Deal found 2/6![American Airlines logo]()
$342
This American Airlines deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/36:55 pm
STL
- LIR
2 stops17h 29m
American Airlines
Thu 5/712:29 pm
LIR
- STL
1 stop8h 55m
American Airlines
Deal found 2/5![American Airlines logo]()
$347
This American Airlines deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/96:53 pm
STL
- SJO
1 stop17h 32m
American Airlines
Wed 5/202:08 pm
SJO
- STL
1 stop17h 42m
American Airlines
Deal found 2/6![American Airlines logo]()
$360
This American Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/66:50 pm
STL
- SJO
1 stop19h 32m
American Airlines
Tue 4/216:30 am
SJO
- STL
1 stop14h 54m
American Airlines
Deal found 2/7![American Airlines logo]()
$368
This American Airlines deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/48:00 am
STL
- SJO
2 stops12h 33m
American Airlines
Sat 3/73:59 pm
SJO
- STL
1 stop17h 33m
American Airlines
Deal found 2/6![American Airlines logo]()
$390
Last-minute flights from St. Louis to Costa RicaDiscover last-minute flight deals from St. Louis to Costa Rica. Data last updated February 8, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Costa Rica. Data last updated February 8, 2026 and is based on user searches.
This Ovago deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/86:00 am
STL
- LIR
1 stop6h 50m
LATAM Airlines
Sun 2/153:30 pm
LIR
- STL
1 stop17h 36m
LATAM Airlines
Deal found 2/7![LATAM Airlines logo]()
$362
This American Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/83:37 pm
STL
- LIR
2 stops20h 35m
American Airlines
Sun 2/153:29 pm
LIR
- STL
1 stop17h 26m
American Airlines
Deal found 2/7![American Airlines logo]()
$372
This American Airlines deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/196:00 am
STL
- LIR
1 stop7h 32m
American Airlines
Sun 3/13:29 pm
LIR
- STL
1 stop17h 26m
American Airlines
Deal found 2/5![American Airlines logo]()
$380
This American Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/216:53 pm
STL
- LIR
1 stop17h 30m
American Airlines
Fri 2/272:32 pm
LIR
- STL
1 stop9h 03m
American Airlines
Deal found 2/7![American Airlines logo]()
$322
This Delta deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/237:10 am
STL
- LIR
1 stop7h 05m
Delta
Thu 3/52:45 pm
LIR
- STL
1 stop8h 38m
Delta
Deal found 2/7![Delta logo]()
$330
This American Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/236:36 pm
STL
- LIR
2 stops19h 49m
American Airlines
Thu 3/51:21 pm
LIR
- STL
1 stop10h 35m
American Airlines
Deal found 2/7![American Airlines logo]()
$335
This United Airlines deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/276:00 am
STL
- LIR
1 stop7h 10m
United Airlines
Thu 3/52:01 pm
LIR
- STL
1 stop8h 58m
United Airlines
Deal found 2/5![United Airlines logo]()
$348
This American Airlines deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/276:36 pm
STL
- LIR
2 stops17h 56m
American Airlines
Thu 3/53:29 pm
LIR
- STL
1 stop17h 26m
American Airlines
Deal found 2/5![American Airlines logo]()
$360
This Delta deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/47:10 am
STL
- SJO
1 stop14h 52m
Delta
Sat 3/77:00 am
SJO
- STL
1 stop8h 56m
Delta
Deal found 2/7![Delta logo]()
$385
This American Airlines deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/56:00 am
STL
- LIR
1 stop7h 32m
American Airlines
Mon 3/91:32 pm
LIR
- STL
1 stop18h 19m
American Airlines
Deal found 2/4![American Airlines logo]()
$368
This Kiwi.com deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/61:09 pm
STL
- SJO
2 stops45h 31m
Multiple Airlines
Wed 3/1111:35 am
SJO
- STL
1 stop10h 44m
Multiple Airlines
Deal found 2/6![Multiple Airlines logo]()
$352
This American Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/246:20 pm
STL
- LIR
1 stop17h 53m
American Airlines
Tue 3/312:18 pm
LIR
- STL
2 stops19h 41m
American Airlines
Deal found 2/7![American Airlines logo]()
$347
One-way flights from St. Louis to Costa RicaSearch for one-way flight options from St. Louis to Costa Rica. Find affordable one-way fares based on user searches. Data last updated February 8, 2026.
Search for one-way flight options from St. Louis to Costa Rica. Find affordable one-way fares based on user searches. Data last updated February 8, 2026.
This United Airlines deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/116:00 am
STL
- SJO
1 stop7h 21m
United Airlines
Deal found 2/4![United Airlines logo]()
$159
This American Airlines deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/256:12 pm
STL
- LIR
2 stops18h 08m
American Airlines
Deal found 2/5![American Airlines logo]()
$161
This Kiwi.com deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/118:13 pm
STL
- SJO
3 stops40h 09m
Multiple Airlines
Deal found 2/4![Multiple Airlines logo]()
$165
This American Airlines deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/275:18 pm
STL
- LIR
1 stop22h 21m
American Airlines
Deal found 2/4![American Airlines logo]()
$168
This Kiwi.com deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/275:45 pm
STL
- LIR
3 stops19h 35m
WestJet
Deal found 2/4![WestJet logo]()
$556
This Kiwi.com deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/257:56 pm
STL
- LIR
3 stops41h 29m
Multiple Airlines
Deal found 2/5![Multiple Airlines logo]()
$572
Find flight deals from St. Louis to Costa Rica
Keep the following information in mind while searching for St. Louis to Costa Rica flight deals. Data was last updated February 8, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $322 (American Airlines) |
One-way from | $159 (United Airlines) |
Popular in | December |
Cheapest in | January |
Average price | $538 |
Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated February 8, 2026.
Use the filters below to find and compare flights from St. Louis to Costa Rica that are best for you.
Fly from
St. Louis
Fly to
Costa Rica
Route
Depart
Return
Price
St. LouisLiberia
STL - LIR
STLLIR
Lambert-St Louis
Sat 2/21
6:53 pm-12:23 pm
1 stop17h 30m
Liberia
Fri 2/27
2:32 pm-11:35 pm
1 stop9h 03m
$322
St. LouisLiberia
STL - LIR
STLLIR
Lambert-St Louis
Tue 4/21
7:12 am-1:40 pm
1 stop7h 28m
Liberia
Tue 4/28
2:10 pm-8:54 am
1 stop17h 44m
$328
St. LouisLiberia
STL - LIR
STLLIR
Lambert-St Louis
Mon 2/23
7:10 am-2:15 pm
1 stop7h 05m
Liberia
Thu 3/5
2:45 pm-11:23 pm
1 stop8h 38m
$330
St. LouisLiberia
STL - LIR
STLLIR
Lambert-St Louis
Mon 2/23
4:13 pm-12:10 pm
2 stops19h 57m
Liberia
Thu 3/5
3:13 pm-8:35 am
2 stops17h 22m
$335
St. LouisLiberia
STL - LIR
STLLIR
Lambert-St Louis
Mon 4/13
6:55 pm-11:24 am
2 stops17h 29m
Liberia
Mon 4/20
2:10 pm-8:54 am
1 stop17h 44m
$340
St. LouisLiberia
STL - LIR
STLLIR
Lambert-St Louis
Sun 4/26
5:20 am-1:40 pm
1 stop9h 20m
Liberia
Fri 5/1
12:28 pm-8:24 am
2 stops18h 56m
$340
St. LouisLiberia
STL - LIR
STLLIR
Lambert-St Louis
Mon 5/4
5:24 am-1:10 pm
1 stop8h 46m
Liberia
Wed 5/13
12:29 pm-10:24 pm
1 stop8h 55m
$342
St. LouisLiberia
STL - LIR
STLLIR
Lambert-St Louis
Sun 5/3
6:55 pm-11:24 am
2 stops17h 29m
Liberia
Thu 5/7
12:29 pm-10:24 pm
1 stop8h 55m
$347
St. LouisSan José
STL - SJO
STLSJO
Lambert-St Louis
Fri 3/6
1:09 pm-10:40 am
2 stops45h 31m
San José Juan Santamaria Intl
Wed 3/11
11:35 am-11:19 pm
1 stop10h 44m
$352
St. LouisSan José
STL - SJO
STLSJO
Lambert-St Louis
Sat 5/9
6:53 pm-11:25 am
1 stop17h 32m
San José Juan Santamaria Intl
Wed 5/20
2:08 pm-8:50 am
1 stop17h 42m
$360
Showing 1-10 of 20 results
Best time to book a flight from St. Louis to Costa Rica
Have a flexible travel schedule? Discover the best time to fly to Costa Rica from St. Louis with our price prediction graph.
STL-LIR
STL-SJO
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from St. Louis to Costa Rica
STL-CR0
STL-LIR
STL-SJO
What is the cheapest month to book a flight from St. Louis to Costa Rica?
Currently, September is the cheapest month in which you can book a flight from St. Louis to Costa Rica (average of $294). Flying from St. Louis to Costa Rica in June is currently the most expensive (average of $407). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
Reviews of airlines servicing Costa Rica
Get insights into the airlines that provide service to Costa Rica. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Costa Rica. Reviews last updated February 8, 2026.
Read through reviews of airlines operating flights from St. Louis to Costa Rica, such as Southwest, Delta, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Overall
8.0
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Costa Rica. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for St. Louis to Costa Rica
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Costa Rica by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from St. Louis to Costa Rica by cabin class
Find flights from St. Louis to Costa Rica, based on your preferred cabin class, be it economy, premium economy, business, or first class.
St. Louis and Costa Rica flights
Browse other St. Louis and Costa Rica flight options. Last updated on February 8, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 4 airlines flying from St. Louis to Costa Rica
Discover the top 4 airlines that operate flights from St. Louis to Costa Rica. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 8, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$209 | Average$486 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$319 | Average$516 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$327 | Average$532 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$376 | Average$637 | FlexibilityNo cancel fee | On-time63% |