$148+ 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 5/28. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SJO
Apr 29 — May 61
Round-trip
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
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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 March 30, 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 March 30, 2026.
This Frontier deal was found by Cheapflights users on 3/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/38:23 am
STL
- SJO
1 stop25h 38m
Frontier
Sat 4/1110:06 am
SJO
- STL
1 stop12h 19m
Frontier
Deal found 3/29![Frontier logo]()
$319
This American Airlines deal was found by Cheapflights users on 3/25. 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 4/265:24 am
STL
- LIR
1 stop8h 46m
American Airlines
Fri 5/12:10 pm
LIR
- STL
1 stop7h 49m
American Airlines
Deal found 3/25![American Airlines logo]()
$330
This Frontier deal was found by Cheapflights users on 3/26. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/213:33 pm
STL
- SJO
2 stops17h 46m
Frontier
Mon 5/259:35 am
SJO
- STL
1 stop13h 46m
Frontier
Deal found 3/26![Frontier logo]()
$338
This Delta deal was found by Cheapflights users on 3/26. 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 4/296:00 am
STL
- SJO
1 stop6h 56m
Delta
Wed 5/201:20 pm
SJO
- STL
1 stop9h 39m
Delta
Deal found 3/26![Delta logo]()
$342
This FlightHub deal was found by Cheapflights users on 3/26. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/196:33 pm
STL
- SJO
2 stops38h 46m
Frontier
Mon 5/259:35 am
SJO
- STL
1 stop13h 46m
Frontier
Deal found 3/26![Frontier logo]()
$345
This American Airlines deal was found by Cheapflights users on 3/26. 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 4/296:29 am
STL
- SJO
2 stops13h 38m
American Airlines
Wed 5/2011:35 pm
SJO
- STL
1 stop17h 55m
American Airlines
Deal found 3/26![American Airlines logo]()
$347
This American Airlines deal was found by Cheapflights users on 3/25. 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 5/185:24 am
STL
- LIR
1 stop8h 46m
American Airlines
Sat 5/232:21 pm
LIR
- STL
1 stop8h 33m
American Airlines
Deal found 3/25![American Airlines logo]()
$348
This American Airlines deal was found by Cheapflights users on 3/25. 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
- LIR
1 stop17h 35m
American Airlines
Sat 5/162:40 pm
LIR
- STL
2 stops16h 47m
American Airlines
Deal found 3/25![American Airlines logo]()
$353
This Priceline deal was found by Cheapflights users on 3/27. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/244:10 pm
STL
- SJO
1 stop17h 10m
Frontier
Sun 6/289:35 am
SJO
- STL
1 stop13h 39m
Frontier
Deal found 3/27![Frontier logo]()
$358
This Delta deal was found by Cheapflights users on 3/27. 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.
Sat 5/96:00 am
STL
- SJO
1 stop6h 52m
Delta
Wed 5/201:20 pm
SJO
- STL
1 stop9h 39m
Delta
Deal found 3/27![Delta logo]()
$360
This American Airlines deal was found by Cheapflights users on 3/26. 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 5/98:57 am
STL
- SJO
2 stops13h 39m
American Airlines
Wed 5/2011:35 pm
SJO
- STL
1 stop17h 55m
American Airlines
Deal found 3/26![American Airlines logo]()
$365
This CheapOair deal was found by Cheapflights users on 3/30. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/196:33 pm
STL
- SJO
2 stops38h 46m
Frontier
Fri 5/299:35 am
SJO
- STL
1 stop13h 46m
Frontier
Deal found 3/30![Frontier logo]()
$375
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 March 30, 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 March 30, 2026.
This American Airlines deal was found by Cheapflights users on 3/25. 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 4/265:21 pm
STL
- LIR
2 stops19h 03m
American Airlines
Fri 5/12:10 pm
LIR
- STL
1 stop17h 44m
American Airlines
Deal found 3/25![American Airlines logo]()
$335
This Delta deal was found by Cheapflights users on 3/26. 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 4/296:00 am
STL
- SJO
1 stop6h 56m
Delta
Wed 5/201:20 pm
SJO
- STL
1 stop9h 39m
Delta
Deal found 3/26![Delta logo]()
$342
This Southwest deal was found by Cheapflights users on 3/25. 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.
Fri 4/245:00 am
STL
- SJO
1 stop8h 10m
Southwest
Fri 5/19:00 am
SJO
- STL
1 stop10h 55m
Southwest
Deal found 3/25![Southwest logo]()
$478
This KAYAK deal was found by Cheapflights users on 3/26. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/258:03 pm
STL
- SJO
2 stops18h 05m
GOL
Sat 5/212:10 pm
SJO
- STL
2 stops19h 20m
GOL
Deal found 3/26![GOL logo]()
$490
This United Airlines deal was found by Cheapflights users on 3/26. 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 4/136:00 am
STL
- LIR
1 stop7h 10m
United Airlines
Sat 4/183:27 pm
LIR
- STL
1 stop16h 58m
United Airlines
Deal found 3/26![United Airlines logo]()
$500
This American Airlines deal was found by Cheapflights users on 3/26. 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 5/46:55 pm
STL
- LIR
2 stops19h 15m
American Airlines
Wed 5/1312:28 pm
LIR
- STL
2 stops19h 26m
American Airlines
Deal found 3/26![American Airlines logo]()
$335
This Delta deal was found by Cheapflights users on 3/26. 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.
Sat 5/96:00 am
STL
- SJO
1 stop8h 15m
Delta
Wed 5/201:20 pm
SJO
- STL
1 stop9h 39m
Delta
Deal found 3/26![Delta logo]()
$360
This American Airlines deal was found by Cheapflights users on 3/29. 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 6/175:15 am
STL
- LIR
1 stop9h 03m
American Airlines
Wed 6/242:45 pm
LIR
- STL
2 stops18h 52m
American Airlines
Deal found 3/29![American Airlines logo]()
$394
This United Airlines deal was found by Cheapflights users on 3/26. 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.
Wed 5/207:09 pm
STL
- SJO
2 stops28h 30m
United Airlines
Wed 5/277:55 am
SJO
- STL
2 stops23h 46m
United Airlines
Deal found 3/26![United Airlines logo]()
$509
This Delta deal was found by Cheapflights users on 3/26. 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.
Sun 8/306:00 am
STL
- SJO
1 stop6h 56m
Delta
Thu 9/31:21 pm
SJO
- STL
1 stop9h 16m
Delta
Deal found 3/26![Delta logo]()
$466
This Southwest deal was found by Cheapflights users on 3/26. 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.
Sat 4/256:25 am
STL
- SJO
1 stop7h 10m
Southwest
Sat 5/29:00 am
SJO
- STL
2 stops9h 10m
Southwest
Deal found 3/26![Southwest logo]()
$519
This American Airlines deal was found by Cheapflights users on 3/25. 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 5/136:54 pm
STL
- LIR
2 stops19h 16m
American Airlines
Mon 5/252:45 pm
LIR
- STL
2 stops20h 14m
American Airlines
Deal found 3/25![American Airlines logo]()
$464
This United Airlines deal was found by Cheapflights users on 3/27. 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 5/256:30 pm
STL
- LIR
1 stop16h 20m
United Airlines
Fri 5/2911:10 am
LIR
- STL
1 stop8h 32m
United Airlines
Deal found 3/27![United Airlines logo]()
$567
This American Airlines deal was found by Cheapflights users on 3/27. 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 5/275:40 pm
STL
- LIR
2 stops18h 42m
American Airlines
Sat 5/3012:35 pm
LIR
- STL
1 stop20h 59m
American Airlines
Deal found 3/27![American Airlines logo]()
$513
This United Airlines deal was found by Cheapflights users on 3/26. 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.
Sat 5/25:28 pm
STL
- SJO
2 stops19h 53m
United Airlines
Tue 5/57:55 am
SJO
- STL
2 stops23h 44m
United Airlines
Deal found 3/26![United Airlines logo]()
$570
This United Airlines deal was found by Cheapflights users on 3/27. 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 5/46:00 am
STL
- SJO
1 stop7h 21m
United Airlines
Thu 5/77:55 am
SJO
- STL
1 stop13h 35m
United Airlines
Deal found 3/27![United Airlines logo]()
$586
Last-minute flights from St. Louis to Costa RicaDiscover last-minute flight deals from St. Louis to Costa Rica. Data last updated March 30, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Costa Rica. Data last updated March 30, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 3/27. 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.
Sun 3/295:00 am
STL
- LIR
1 stop7h 53m
United Airlines
Thu 4/21:20 pm
LIR
- STL
1 stop8h 08m
United Airlines
Deal found 3/27![United Airlines logo]()
$452
This American Airlines deal was found by Cheapflights users on 3/27. 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 3/296:57 pm
STL
- LIR
2 stops19h 21m
American Airlines
Thu 4/212:30 pm
LIR
- STL
2 stops19h 05m
American Airlines
Deal found 3/27![American Airlines logo]()
$457
This Frontier deal was found by Cheapflights users on 3/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/38:23 am
STL
- SJO
1 stop25h 38m
Frontier
Sat 4/1110:06 am
SJO
- STL
1 stop12h 19m
Frontier
Deal found 3/29![Frontier logo]()
$319
This Kiwi.com deal was found by Cheapflights users on 3/27. 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 4/134:59 pm
STL
- SJO
1 stop18h 43m
Multiple Airlines
Fri 4/172:20 am
SJO
- STL
2 stops16h 12m
Multiple Airlines
Deal found 3/27![Multiple Airlines logo]()
$406
This American Airlines deal was found by Cheapflights users on 3/27. 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 4/145:53 pm
STL
- LIR
2 stops20h 17m
American Airlines
Thu 4/302:40 pm
LIR
- STL
2 stops16h 50m
American Airlines
Deal found 3/27![American Airlines logo]()
$379
This KAYAK deal was found by Cheapflights users on 3/25. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/246:55 pm
STL
- SJO
2 stops17h 12m
GOL
Fri 5/112:35 pm
SJO
- STL
2 stops19h 19m
GOL
Deal found 3/25![GOL logo]()
$443
This Southwest deal was found by Cheapflights users on 3/25. 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.
Fri 4/245:00 am
STL
- SJO
1 stop8h 10m
Southwest
Fri 5/19:00 am
SJO
- STL
1 stop10h 55m
Southwest
Deal found 3/25![Southwest logo]()
$478
This Delta deal was found by Cheapflights users on 3/26. 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.
Sat 4/257:25 am
STL
- SJO
1 stop6h 41m
Delta
Sat 5/22:31 pm
SJO
- STL
1 stop8h 05m
Delta
Deal found 3/26![Delta logo]()
$458
This KAYAK deal was found by Cheapflights users on 3/26. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/258:03 pm
STL
- SJO
2 stops18h 05m
GOL
Sat 5/212:10 pm
SJO
- STL
2 stops19h 20m
GOL
Deal found 3/26![GOL logo]()
$490
This American Airlines deal was found by Cheapflights users on 3/25. 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 4/265:24 am
STL
- LIR
1 stop8h 46m
American Airlines
Fri 5/12:10 pm
LIR
- STL
1 stop7h 49m
American Airlines
Deal found 3/25![American Airlines logo]()
$330
This Delta deal was found by Cheapflights users on 3/26. 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 4/296:00 am
STL
- SJO
1 stop6h 56m
Delta
Wed 5/201:20 pm
SJO
- STL
1 stop9h 39m
Delta
Deal found 3/26![Delta logo]()
$342
This American Airlines deal was found by Cheapflights users on 3/26. 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 4/296:29 am
STL
- SJO
2 stops13h 38m
American Airlines
Wed 5/2011:35 pm
SJO
- STL
1 stop17h 55m
American Airlines
Deal found 3/26![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 March 30, 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 March 30, 2026.
This FlightHub deal was found by Cheapflights users on 3/26. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/284:19 pm
STL
- SJO
1 stop17h 00m
Frontier
Deal found 3/26![Frontier logo]()
$148
This American Airlines deal was found by Cheapflights users on 3/29. 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 4/225:24 am
STL
- LIR
1 stop7h 00m
American Airlines
Deal found 3/29![American Airlines logo]()
$156
This American Airlines deal was found by Cheapflights users on 3/26. 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 5/286:15 am
STL
- SJO
2 stops14h 09m
American Airlines
Deal found 3/26![American Airlines logo]()
$168
This Expedia deal was found by Cheapflights users on 3/28. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/244:10 pm
STL
- SJO
1 stop17h 10m
Frontier
Deal found 3/28![Frontier logo]()
$178
This Kiwi.com deal was found by Cheapflights users on 3/29. 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 5/115:27 pm
STL
- SJO
2 stops46h 38m
Multiple Airlines
Deal found 3/29![Multiple Airlines logo]()
$216
This American Airlines deal was found by Cheapflights users on 3/29. 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 5/116:54 pm
STL
- SJO
1 stop17h 41m
American Airlines
Deal found 3/29![American Airlines logo]()
$217
This TravelUp deal was found by Cheapflights users on 3/30. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/295:18 pm
STL
- SJO
2 stops19h 32m
Iberia
Deal found 3/30![Iberia logo]()
$224
This United Airlines deal was found by Cheapflights users on 3/28. 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.
Wed 6/245:41 pm
STL
- SJO
2 stops17h 30m
United Airlines
Deal found 3/28![United Airlines logo]()
$228
This KAYAK deal was found by Cheapflights users on 3/28. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/156:12 pm
STL
- SJO
2 stops18h 44m
GOL
Deal found 3/28![GOL logo]()
$244
This Kiwi.com deal was found by Cheapflights users on 3/29. 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.
Wed 4/228:23 pm
STL
- LIR
3 stops42h 00m
Multiple Airlines
Deal found 3/29![Multiple Airlines logo]()
$673
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 March 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $330 (American Airlines) |
One-way from | $148 (FlightHub) |
Popular in | December |
Cheapest in | January |
Average price | $821 |
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 March 30, 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
Cheapest round-trip
St. LouisLiberia
STL - LIR
STLLIR
Lambert-St Louis
Sun 4/26
5:21 pm-11:24 am
2 stops19h 03m
Liberia
Fri 5/1
2:10 pm-8:54 am
1 stop17h 44m
$335
St. LouisLiberia
STL - LIR
STLLIR
Lambert-St Louis
Mon 5/4
6:55 pm-1:10 pm
2 stops19h 15m
Liberia
Wed 5/13
12:28 pm-8:54 am
2 stops19h 26m
$335
St. LouisSan José
STL - SJO
STLSJO
Lambert-St Louis
Wed 4/29
6:00 am-11:56 am
1 stop6h 56m
San José Juan Santamaria Intl
Wed 5/20
1:20 pm-11:59 pm
1 stop9h 39m
$342
St. LouisSan José
STL - SJO
STLSJO
Lambert-St Louis
Sat 5/9
6:00 am-1:15 pm
1 stop8h 15m
San José Juan Santamaria Intl
Wed 5/20
1:20 pm-11:59 pm
1 stop9h 39m
$360
St. LouisLiberia
STL - LIR
STLLIR
Lambert-St Louis
Wed 6/17
5:15 am-1:18 pm
1 stop9h 03m
Liberia
Wed 6/24
2:45 pm-10:37 am
2 stops18h 52m
$394
St. LouisLiberia
STL - LIR
STLLIR
Lambert-St Louis
Wed 5/13
6:54 pm-1:10 pm
2 stops19h 16m
Liberia
Mon 5/25
2:45 pm-11:59 am
2 stops20h 14m
$464
Quickest round-trip
St. LouisSan José
STL - SJO
STLSJO
Lambert-St Louis
Sun 8/30
6:00 am-11:56 am
1 stop6h 56m
San José Juan Santamaria Intl
Thu 9/3
1:21 pm-11:37 pm
1 stop9h 16m
$466
St. LouisSan José
STL - SJO
STLSJO
Lambert-St Louis
Fri 4/24
5:00 am-12:10 pm
1 stop8h 10m
San José Juan Santamaria Intl
Fri 5/1
9:00 am-8:55 pm
1 stop10h 55m
$478
St. LouisSan José
STL - SJO
STLSJO
Lambert-St Louis
Sat 4/25
8:03 pm-1:08 pm
2 stops18h 05m
San José Juan Santamaria Intl
Sat 5/2
12:10 pm-8:30 am
2 stops19h 20m
$490
St. LouisLiberia
STL - LIR
STLLIR
Lambert-St Louis
Mon 4/13
6:00 am-12:10 pm
1 stop7h 10m
Liberia
Sat 4/18
3:27 pm-9:25 am
1 stop16h 58m
$500
Showing 1-10 of 27 resultsSorted by cheapest first
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-SJO
STL-LIR
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-SJO
STL-LIR
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 $412). 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 March 30, 2026.
Read through reviews of airlines operating flights from St. Louis to Costa Rica, such as Southwest,Delta, andUnited Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Overall
8.0
Crew
8.6
Food
7.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Overall
8.0
Crew
8.6
Food
7.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Overall
8.0
Crew
8.6
Food
7.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Overall
8.0
Crew
8.6
Food
7.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Overall
8.0
Crew
8.6
Food
7.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
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
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Complete your trip
Complete your trip to Costa Rica by adding a car rental and/or hotel reservation to your travel itinerary.
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St. Louis and Costa Rica flights
Browse other St. Louis and Costa Rica flight options. Last updated on March 30, 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 March 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$257 | Average$483 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$314 | Average$519 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$327 | Average$491 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$383 | Average$682 | FlexibilityNo cancel fee | On-time63% |