$201+ 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 8/30. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SJO
Aug 24 — Aug 311
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 July 25, 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 July 25, 2026.
This Air Canada deal was found by Cheapflights users on 7/23. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/14:05 pm
STL
- LIR
1 stop22h 05m
Air Canada
Sun 12/63:10 pm
LIR
- STL
1 stop24h 16m
Air Canada
Deal found 7/23![Air Canada logo]()
$466
This Air Canada deal was found by Cheapflights users on 7/24. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/44:05 pm
STL
- LIR
2 stops22h 15m
Air Canada
Sat 11/143:20 pm
LIR
- STL
2 stops24h 06m
Air Canada
Deal found 7/24![Air Canada logo]()
$472
This Air Canada deal was found by Cheapflights users on 7/20. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/264:05 pm
STL
- LIR
1 stop22h 05m
Air Canada
Tue 12/13:10 pm
LIR
- STL
1 stop24h 16m
Air Canada
Deal found 7/20![Air Canada logo]()
$474
This Air Canada deal was found by Cheapflights users on 7/22. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/254:05 pm
STL
- LIR
1 stop22h 05m
Air Canada
Thu 10/292:10 pm
LIR
- STL
1 stop24h 16m
Air Canada
Deal found 7/22![Air Canada logo]()
$480
This Air Canada deal was found by Cheapflights users on 7/20. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/64:05 pm
STL
- LIR
1 stop22h 05m
Air Canada
Sun 12/133:10 pm
LIR
- STL
1 stop24h 16m
Air Canada
Deal found 7/20![Air Canada logo]()
$502
This American Airlines deal was found by Cheapflights users on 7/24. 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 8/305:23 am
STL
- SJO
1 stop8h 03m
American Airlines
Thu 9/31:29 pm
SJO
- STL
1 stop8h 11m
American Airlines
Deal found 7/24![American Airlines logo]()
$502
This Air Canada deal was found by Cheapflights users on 7/20. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/74:05 pm
STL
- LIR
2 stops22h 15m
Air Canada
Mon 12/143:10 pm
LIR
- STL
1 stop24h 16m
Air Canada
Deal found 7/20![Air Canada logo]()
$505
This Delta deal was found by Cheapflights users on 7/22. 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 9/136:00 am
STL
- SJO
1 stop6h 54m
Delta
Thu 9/241:19 pm
SJO
- STL
1 stop9h 23m
Delta
Deal found 7/22![Delta logo]()
$510
This United Airlines deal was found by Cheapflights users on 7/22. 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 9/238:00 am
STL
- SJO
2 stops12h 37m
United Airlines
Wed 9/301:25 pm
SJO
- STL
1 stop8h 05m
United Airlines
Deal found 7/22![United Airlines logo]()
$515
This Southwest deal was found by Cheapflights users on 7/23. 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.
Sun 11/18:25 pm
STL
- SJO
2 stops16h 50m
Southwest
Wed 11/181:20 pm
SJO
- STL
2 stops18h 25m
Southwest
Deal found 7/23![Southwest logo]()
$516
This American Airlines deal was found by Cheapflights users on 7/22. 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 12/15:00 am
STL
- SJO
1 stop15h 53m
American Airlines
Mon 12/2112:34 am
SJO
- STL
1 stop14h 26m
American Airlines
Deal found 7/22![American Airlines logo]()
$532
This United Airlines deal was found by Cheapflights users on 7/23. 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 10/196:15 am
STL
- SJO
1 stop7h 06m
United Airlines
Mon 10/261:25 pm
SJO
- STL
1 stop7h 55m
United Airlines
Deal found 7/23![United Airlines logo]()
$540
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 July 25, 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 July 25, 2026.
This United Airlines deal was found by Cheapflights users on 7/20. 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 10/186:15 am
STL
- LIR
1 stop6h 55m
United Airlines
Sun 10/251:20 pm
LIR
- STL
1 stop8h 00m
United Airlines
Deal found 7/20![United Airlines logo]()
$528
This American Airlines deal was found by Cheapflights users on 7/20. 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 9/137:00 am
STL
- LIR
1 stop7h 47m
American Airlines
Sat 9/192:18 pm
LIR
- STL
1 stop18h 06m
American Airlines
Deal found 7/20![American Airlines logo]()
$528
This Southwest deal was found by Cheapflights users on 7/20. 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.
Sun 10/185:00 am
STL
- LIR
1 stop8h 45m
Southwest
Sun 10/251:45 pm
LIR
- STL
2 stops16h 55m
Southwest
Deal found 7/20![Southwest logo]()
$534
This Delta deal was found by Cheapflights users on 7/22. 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 9/266:00 am
STL
- SJO
1 stop6h 54m
Delta
Tue 9/291:19 pm
SJO
- STL
1 stop9h 23m
Delta
Deal found 7/22![Delta logo]()
$540
This United Airlines deal was found by Cheapflights users on 7/21. 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 9/205:30 pm
STL
- LIR
2 stops19h 40m
United Airlines
Sat 9/2611:49 am
LIR
- STL
1 stop10h 55m
United Airlines
Deal found 7/21![United Airlines logo]()
$528
This Southwest deal was found by Cheapflights users on 7/22. 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.
Sun 9/276:05 am
STL
- SJO
1 stop6h 30m
Southwest
Sun 11/12:10 pm
SJO
- STL
1 stop8h 25m
Southwest
Deal found 7/22![Southwest logo]()
$542
This American Airlines deal was found by Cheapflights users on 7/23. 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 9/1610:14 am
STL
- SJO
2 stops10h 53m
American Airlines
Sat 9/192:57 pm
SJO
- STL
2 stops18h 23m
American Airlines
Deal found 7/23![American Airlines logo]()
$545
This United Airlines deal was found by Cheapflights users on 7/22. 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 9/276:15 am
STL
- SJO
1 stop7h 06m
United Airlines
Sun 11/12:25 pm
SJO
- STL
1 stop7h 55m
United Airlines
Deal found 7/22![United Airlines logo]()
$540
This American Airlines deal was found by Cheapflights users on 7/21. 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 9/2612:46 pm
STL
- SJO
1 stop26h 11m
American Airlines
Sat 10/36:00 am
SJO
- STL
2 stops16h 43m
American Airlines
Deal found 7/21![American Airlines logo]()
$553
This United Airlines deal was found by Cheapflights users on 7/21. 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 10/76:15 am
STL
- SJO
1 stop7h 06m
United Airlines
Sun 10/117:55 am
SJO
- STL
1 stop13h 35m
United Airlines
Deal found 7/21![United Airlines logo]()
$540
This American Airlines deal was found by Cheapflights users on 7/20. 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 9/136:30 am
STL
- SJO
2 stops14h 37m
American Airlines
Sat 9/192:57 pm
SJO
- STL
2 stops18h 23m
American Airlines
Deal found 7/20![American Airlines logo]()
$567
This United Airlines deal was found by Cheapflights users on 7/20. 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.
Thu 10/226:15 am
STL
- LIR
1 stop6h 55m
United Airlines
Mon 10/267:40 am
LIR
- STL
1 stop13h 40m
United Airlines
Deal found 7/20![United Airlines logo]()
$558
This American Airlines deal was found by Cheapflights users on 7/21. 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 9/165:18 pm
STL
- LIR
2 stops21h 29m
American Airlines
Mon 9/212:47 pm
LIR
- STL
2 stops20h 28m
American Airlines
Deal found 7/21![American Airlines logo]()
$568
This United Airlines deal was found by Cheapflights users on 7/23. 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 9/68:35 am
STL
- SJO
1 stop12h 02m
United Airlines
Sun 9/131:25 pm
SJO
- STL
1 stop8h 02m
United Airlines
Deal found 7/23![United Airlines logo]()
$576
This American Airlines deal was found by Cheapflights users on 7/20. 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 9/58:06 pm
STL
- SJO
2 stops17h 01m
American Airlines
Wed 9/162:57 pm
SJO
- STL
2 stops17h 27m
American Airlines
Deal found 7/20![American Airlines logo]()
$576
This American Airlines deal was found by Cheapflights users on 7/21. 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 9/55:11 pm
STL
- LIR
1 stop21h 27m
American Airlines
Sat 9/122:47 pm
LIR
- STL
2 stops21h 29m
American Airlines
Deal found 7/21![American Airlines logo]()
$584
This United Airlines deal was found by Cheapflights users on 7/22. 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 9/612:59 pm
STL
- LIR
2 stops24h 11m
United Airlines
Sun 9/131:20 pm
LIR
- STL
1 stop8h 07m
United Airlines
Deal found 7/22![United Airlines logo]()
$690
This American Airlines deal was found by Cheapflights users on 7/20. 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 8/1210:16 am
STL
- LIR
1 stop28h 22m
American Airlines
Tue 8/1812:35 pm
LIR
- STL
2 stops19h 08m
American Airlines
Deal found 7/20![American Airlines logo]()
$817
Last-minute flights from St. Louis to Costa RicaDiscover last-minute flight deals from St. Louis to Costa Rica. Data last updated July 25, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Costa Rica. Data last updated July 25, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 7/22. 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 7/246:13 pm
STL
- LIR
2 stops18h 09m
American Airlines
Fri 7/3112:35 pm
LIR
- STL
2 stops18h 56m
American Airlines
Deal found 7/22![American Airlines logo]()
$617
This American Airlines deal was found by Cheapflights users on 7/22. 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 8/128:07 pm
STL
- LIR
2 stops18h 31m
American Airlines
Tue 8/1812:35 pm
LIR
- STL
2 stops19h 49m
American Airlines
Deal found 7/22![American Airlines logo]()
$582
This Expedia deal was found by Cheapflights users on 7/24. 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 8/124:09 pm
STL
- SJO
1 stop17h 11m
Frontier
Sun 8/169:35 am
SJO
- STL
1 stop13h 24m
Frontier
Deal found 7/24![Frontier logo]()
$583
This Justfly.com deal was found by Cheapflights users on 7/24. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/136:34 pm
STL
- SJO
2 stops38h 56m
Frontier
Sun 8/169:35 am
SJO
- STL
1 stop13h 24m
Frontier
Deal found 7/24![Frontier logo]()
$589
This American Airlines deal was found by Cheapflights users on 7/22. 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 8/133:35 pm
STL
- LIR
1 stop23h 03m
American Airlines
Tue 8/1812:35 pm
LIR
- STL
2 stops26h 49m
American Airlines
Deal found 7/22![American Airlines logo]()
$800
This American Airlines deal was found by Cheapflights users on 7/22. 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 8/1512:45 pm
STL
- LIR
1 stop25h 53m
American Airlines
Tue 8/1812:35 pm
LIR
- STL
2 stops26h 49m
American Airlines
Deal found 7/22![American Airlines logo]()
$769
This American Airlines deal was found by Cheapflights users on 7/21. 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 8/206:00 am
STL
- SJO
2 stops14h 53m
American Airlines
Thu 8/272:56 pm
SJO
- STL
2 stops17h 36m
American Airlines
Deal found 7/21![American Airlines logo]()
$567
This American Airlines deal was found by Cheapflights users on 7/20. 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 8/245:00 am
STL
- SJO
1 stop8h 03m
American Airlines
Mon 8/316:00 am
SJO
- STL
1 stop15h 40m
American Airlines
Deal found 7/20![American Airlines logo]()
$579
This American Airlines deal was found by Cheapflights users on 7/24. 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 8/305:23 am
STL
- SJO
1 stop8h 03m
American Airlines
Thu 9/31:29 pm
SJO
- STL
1 stop8h 11m
American Airlines
Deal found 7/24![American Airlines logo]()
$502
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 July 25, 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 July 25, 2026.
This Southwest deal was found by Cheapflights users on 7/23. 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.
Sun 8/306:05 am
STL
- SJO
1 stop6h 30m
Southwest
Deal found 7/23![Southwest logo]()
$201
This Air Canada deal was found by Cheapflights users on 7/23. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/308:55 am
STL
- SJO
2 stops12h 25m
Air Canada
Deal found 7/23![Air Canada logo]()
$217
This American Airlines deal was found by Cheapflights users on 7/22. 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 8/243:32 pm
STL
- LIR
2 stops20h 57m
American Airlines
Deal found 7/22![American Airlines logo]()
$233
This Air Canada deal was found by Cheapflights users on 7/21. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/288:55 am
STL
- SJO
2 stops12h 25m
Air Canada
Deal found 7/21![Air Canada logo]()
$233
This FlightHub deal was found by Cheapflights users on 7/22. 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.
Sat 8/84:09 pm
STL
- SJO
1 stop17h 11m
Frontier
Deal found 7/22![Frontier logo]()
$255
This Priceline deal was found by Cheapflights users on 7/23. 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.
Fri 8/74:09 pm
STL
- SJO
1 stop17h 21m
Frontier
Deal found 7/23![Frontier logo]()
$259
This American Airlines deal was found by Cheapflights users on 7/21. 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 8/2811:35 am
STL
- SJO
1 stop9h 17m
American Airlines
Deal found 7/21![American Airlines logo]()
$264
This United Airlines deal was found by Cheapflights users on 7/23. 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.
Tue 8/45:59 pm
STL
- LIR
2 stops17h 45m
United Airlines
Deal found 7/23![United Airlines logo]()
$270
This Priceline deal was found by Cheapflights users on 7/22. 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.
Sat 8/14:09 pm
STL
- SJO
1 stop17h 11m
Frontier
Deal found 7/22![Frontier logo]()
$273
This Southwest deal was found by Cheapflights users on 7/19. 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.
Sun 8/26:25 am
STL
- SJO
1 stop13h 15m
Southwest
Deal found 7/19![Southwest logo]()
$308
This American Airlines deal was found by Cheapflights users on 7/19. 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 7/279:25 am
STL
- SJO
2 stops11h 10m
American Airlines
Deal found 7/19![American Airlines logo]()
$313
This United Airlines deal was found by Cheapflights users on 7/24. 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 8/211:10 am
STL
- SJO
1 stop12h 29m
United Airlines
Deal found 7/24![United Airlines logo]()
$328
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 July 25, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $445 (American Airlines) |
One-way from | $201 (Southwest) |
Popular in | December |
Cheapest in | September |
Average price | $732 |
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 July 25, 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
Quickest round-trip
St. LouisLiberia
STL - LIR
STLLIR
Lambert-St Louis
Sun 10/18
6:15 am-12:10 pm
1 stop6h 55m
Liberia
Sun 10/25
1:20 pm-10:20 pm
1 stop8h 00m
$528
St. LouisLiberia
STL - LIR
STLLIR
Lambert-St Louis
Sun 9/13
7:00 am-1:47 pm
1 stop7h 47m
Liberia
Sat 9/19
2:18 pm-9:24 am
1 stop18h 06m
$528
St. LouisLiberia
STL - LIR
STLLIR
Lambert-St Louis
Sun 9/20
5:30 pm-12:10 pm
2 stops19h 40m
Liberia
Sat 9/26
11:49 am-11:44 pm
1 stop10h 55m
$528
St. LouisLiberia
STL - LIR
STLLIR
Lambert-St Louis
Sun 10/18
5:00 am-12:45 pm
1 stop8h 45m
Liberia
Sun 10/25
1:45 pm-7:40 am
2 stops16h 55m
$534
St. LouisSan José
STL - SJO
STLSJO
Lambert-St Louis
Sat 9/26
6:00 am-11:54 am
1 stop6h 54m
San José Juan Santamaria Intl
Tue 9/29
1:19 pm-11:42 pm
1 stop9h 23m
$540
St. LouisSan José
STL - SJO
STLSJO
Lambert-St Louis
Sun 9/27
6:15 am-12:21 pm
1 stop7h 06m
San José Juan Santamaria Intl
Sun 11/1
2:25 pm-10:20 pm
1 stop7h 55m
$540
St. LouisSan José
STL - SJO
STLSJO
Lambert-St Louis
Wed 10/7
6:15 am-12:21 pm
1 stop7h 06m
San José Juan Santamaria Intl
Sun 10/11
7:55 am-10:30 pm
1 stop13h 35m
$540
St. LouisSan José
STL - SJO
STLSJO
Lambert-St Louis
Sun 9/27
6:05 am-11:35 am
1 stop6h 30m
San José Juan Santamaria Intl
Sun 11/1
2:10 pm-10:35 pm
1 stop8h 25m
$542
St. LouisSan José
STL - SJO
STLSJO
Lambert-St Louis
Wed 9/16
10:14 am-8:07 pm
2 stops10h 53m
San José Juan Santamaria Intl
Sat 9/19
2:57 pm-10:20 am
2 stops18h 23m
$545
St. LouisSan José
STL - SJO
STLSJO
Lambert-St Louis
Sat 9/26
12:46 pm-1:57 pm
1 stop26h 11m
San José Juan Santamaria Intl
Sat 10/3
6:00 am-11:43 pm
2 stops16h 43m
$553
Showing 1-10 of 32 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 $435). Flying from St. Louis to Costa Rica in December is currently the most expensive (average of $905). 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.
How far ahead should I book a flight from St. Louis to Costa Rica?
Booking 32 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis to Costa Rica. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
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 July 25, 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.
Entertainment
7.5
Comfort
8.0
Crew
8.6
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Entertainment
7.5
Comfort
8.0
Crew
8.6
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Entertainment
7.5
Comfort
8.0
Crew
8.6
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Entertainment
7.5
Comfort
8.0
Crew
8.6
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Entertainment
7.5
Comfort
8.0
Crew
8.6
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Entertainment
7.5
Comfort
8.0
Crew
8.6
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
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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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 July 25, 2026.
Popular flight searches
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Top 5 airlines flying from St. Louis to Costa Rica
Discover the top 5 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 July 25, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$294 | Average$562 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$314 | Average$542 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$334 | Average$551 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$383 | Average$776 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$644 | Average$1,039 | FlexibilityNo cancel fee | On-time74% |