$203+ Cheap flights from St. Louis (STL) to Costa Rica
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/10. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SJO
Oct 9 — Oct 161
Round-trip
1 adult, Economy
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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 September 9, 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 September 9, 2026.
This Air Canada deal was found by Cheapflights users on 9/6. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/248:55 am -
1 stop29h 15m
Tue 10/272:10 pm -
1 stop24h 13m
Deal found 9/6![Air Canada logo]()
$382
This American Airlines deal was found by Cheapflights users on 9/7. 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 12/55:16 pm -
2 stops19h 17m
Fri 12/111:33 pm -
2 stops10h 25m
Deal found 9/7![American Airlines logo]()
$411
This American Airlines deal was found by Cheapflights users on 9/5. 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.
Wed 10/146:32 am -
1 stop8h 28m
Wed 10/211:00 pm -
1 stop9h 42m
Deal found 9/5![American Airlines logo]()
$418
This American Airlines deal was found by Cheapflights users on 9/6. 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 10/265:27 pm -
2 stops20h 51m
Sat 10/312:18 pm -
2 stops21h 44m
Deal found 9/6![American Airlines logo]()
$432
This American Airlines deal was found by Cheapflights users on 9/6. 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.
Fri 11/66:15 pm -
1 stop20h 02m
Fri 11/131:33 pm -
1 stop8h 14m
Deal found 9/6![American Airlines logo]()
$438
This American Airlines deal was found by Cheapflights users on 9/5. 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.
Wed 11/45:00 am -
1 stop8h 46m
Tue 11/102:46 pm -
1 stop8h 47m
Deal found 9/5![American Airlines logo]()
$466
This Kiwi.com deal was found by Cheapflights users on 9/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/196:35 pm -
2 stops38h 20m
Sat 10/249:45 am -
1 stop12h 28m
Deal found 9/7![Multiple Airlines logo]()
$487
This Southwest deal was found by Cheapflights users on 9/7. 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 10/195:25 am -
2 stops15h 15m
Fri 10/231:30 pm -
1 stop8h 00m
Deal found 9/7![Southwest logo]()
$490
This Air Canada deal was found by Cheapflights users on 9/4. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/54:05 pm -
1 stop22h 05m
Fri 12/113:10 pm -
1 stop24h 16m
Deal found 9/4![Air Canada logo]()
$492
This American Airlines deal was found by Cheapflights users on 9/4. 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 11/148:15 pm -
2 stops18h 02m
Sat 11/213:23 pm -
1 stop18h 08m
Deal found 9/4![American 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 September 9, 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 September 9, 2026.
This American Airlines deal was found by Cheapflights users on 9/7. 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 12/55:16 pm -
2 stops19h 17m
Fri 12/111:33 pm -
2 stops10h 25m
Deal found 9/7![American Airlines logo]()
$411
This Southwest deal was found by Cheapflights users on 9/7. 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 10/195:25 am -
2 stops15h 15m
Fri 10/231:30 pm -
1 stop8h 00m
Deal found 9/7![Southwest logo]()
$490
This United Airlines deal was found by Cheapflights users on 9/4. 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 11/166:15 am -
1 stop7h 07m
Thu 11/198:45 am -
1 stop13h 40m
Deal found 9/4![United Airlines logo]()
$586
This BusinessClass deal was found by Cheapflights users on 9/4. 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 BusinessClass is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/103:20 pm -
2 stops21h 40m
Sat 10/173:01 pm -
2 stops18h 50m
Deal found 9/4![GOL logo]()
$600
This American Airlines deal was found by Cheapflights users on 9/7. 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 10/196:32 am -
1 stop8h 28m
Fri 10/231:00 pm -
1 stop9h 42m
Deal found 9/7![American Airlines logo]()
$488
This American Airlines deal was found by Cheapflights users on 9/8. 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 11/46:00 am -
1 stop7h 46m
Tue 11/102:46 pm -
1 stop8h 47m
Deal found 9/8![American Airlines logo]()
$488
This Southwest deal was found by Cheapflights users on 9/8. 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 10/235:25 am -
2 stops15h 15m
Fri 10/301:30 pm -
1 stop8h 00m
Deal found 9/8![Southwest logo]()
$570
This American Airlines deal was found by Cheapflights users on 9/5. 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.
Wed 10/217:16 am -
2 stops14h 05m
Wed 10/286:00 am -
2 stops13h 57m
Deal found 9/5![American Airlines logo]()
$493
This United Airlines deal was found by Cheapflights users on 9/4. 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.
Sat 10/106:15 am -
1 stop6h 55m
Sat 10/174:30 pm -
1 stop15h 18m
Deal found 9/4![United Airlines logo]()
$616
This Southwest deal was found by Cheapflights users on 9/7. 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.
Thu 10/158:30 am -
2 stops12h 10m
Wed 10/219:00 am -
2 stops10h 00m
Deal found 9/7![Southwest logo]()
$575
This United Airlines deal was found by Cheapflights users on 9/4. 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 10/196:15 am -
1 stop6h 55m
Thu 10/221:20 pm -
2 stops21h 53m
Deal found 9/4![United Airlines logo]()
$640
This American Airlines deal was found by Cheapflights users on 9/6. 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.
Thu 11/56:15 pm -
1 stop20h 02m
Sat 11/143:17 pm -
1 stop8h 16m
Deal found 9/6![American Airlines logo]()
$603
This United Airlines deal was found by Cheapflights users on 9/4. 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.
Wed 11/410:53 am -
2 stops26h 17m
Sat 11/142:06 pm -
1 stop18h 49m
Deal found 9/4![United Airlines logo]()
$670
This American Airlines deal was found by Cheapflights users on 9/7. 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 9/135:15 am -
2 stops9h 03m
Sat 9/192:47 pm -
2 stops18h 31m
Deal found 9/7![American Airlines logo]()
$637
Last-minute flights from St. Louis to Costa RicaDiscover last-minute flight deals from St. Louis to Costa Rica. Data last updated September 9, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Costa Rica. Data last updated September 9, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 9/4. 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 10/105:23 pm -
2 stops20h 55m
Sat 10/172:44 pm -
2 stops18h 57m
Deal found 9/4![American Airlines logo]()
$552
This American Airlines deal was found by Cheapflights users on 9/5. 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.
Wed 10/146:32 am -
1 stop8h 28m
Wed 10/211:00 pm -
1 stop9h 42m
Deal found 9/5![American Airlines logo]()
$418
This American Airlines deal was found by Cheapflights users on 9/7. 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.
Thu 10/155:40 am -
1 stop9h 20m
Wed 10/211:00 pm -
1 stop9h 42m
Deal found 9/7![American Airlines logo]()
$568
This Kiwi.com deal was found by Cheapflights users on 9/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/196:35 pm -
2 stops38h 20m
Sat 10/249:45 am -
1 stop12h 28m
Deal found 9/7![Multiple Airlines logo]()
$487
This American Airlines deal was found by Cheapflights users on 9/7. 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 10/196:32 am -
1 stop8h 28m
Fri 10/231:00 pm -
1 stop9h 42m
Deal found 9/7![American Airlines logo]()
$488
This Southwest deal was found by Cheapflights users on 9/7. 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 10/195:25 am -
2 stops15h 15m
Fri 10/231:30 pm -
1 stop8h 00m
Deal found 9/7![Southwest logo]()
$490
This Southwest deal was found by Cheapflights users on 9/7. 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 10/195:25 am -
2 stops15h 15m
Sat 10/249:00 am -
2 stops10h 00m
Deal found 9/7![Southwest logo]()
$570
This United Airlines deal was found by Cheapflights users on 9/4. 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 10/197:01 pm -
2 stops18h 09m
Mon 10/264:20 pm -
1 stop15h 33m
Deal found 9/4![United Airlines logo]()
$587
This American Airlines deal was found by Cheapflights users on 9/5. 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.
Wed 10/217:16 am -
2 stops14h 05m
Wed 10/286:00 am -
2 stops13h 57m
Deal found 9/5![American Airlines logo]()
$493
This Air Canada deal was found by Cheapflights users on 9/6. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/248:55 am -
1 stop29h 15m
Tue 10/272:10 pm -
1 stop24h 13m
Deal found 9/6![Air Canada logo]()
$382
This American Airlines deal was found by Cheapflights users on 9/6. 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 10/245:40 pm -
2 stops20h 38m
Tue 10/272:44 pm -
2 stops20h 27m
Deal found 9/6![American Airlines logo]()
$523
This American Airlines deal was found by Cheapflights users on 9/6. 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 10/265:27 pm -
2 stops20h 51m
Sat 10/312:18 pm -
2 stops21h 44m
Deal found 9/6![American Airlines logo]()
$432
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 September 9, 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 September 9, 2026.
This American Airlines deal was found by Cheapflights users on 9/5. 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 10/106:07 pm -
1 stop18h 53m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![American Airlines logo]()
$203
This Kiwi.com deal was found by Cheapflights users on 9/5. 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 10/126:35 pm -
2 stops38h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![Multiple Airlines logo]()
$221
This American Airlines deal was found by Cheapflights users on 9/5. 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 10/126:32 am -
1 stop8h 28m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![American Airlines logo]()
$256
This Kiwi.com deal was found by Cheapflights users on 9/4. 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.
Fri 10/22:29 pm -
2 stops18h 26m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![Multiple Airlines logo]()
$286
This Copa Airlines deal was found by Cheapflights users on 9/5. 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 Copa Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/108:00 am -
2 stops25h 19m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![Copa Airlines logo]()
$289
This Delta deal was found by Cheapflights users on 9/7. 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.
Fri 10/306:00 am -
1 stop6h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Delta logo]()
$292
This American Airlines deal was found by Cheapflights users on 9/4. 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 9/263:34 pm -
1 stop23h 23m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![American Airlines logo]()
$292
This United Airlines deal was found by Cheapflights users on 9/8. 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 10/116:15 am -
1 stop14h 22m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![United Airlines logo]()
$294
This Southwest deal was found by Cheapflights users on 9/7. 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.
Fri 10/309:00 pm -
2 stops16h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Southwest logo]()
$298
This American Airlines deal was found by Cheapflights users on 9/5. 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 10/116:00 am -
2 stops15h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![American Airlines logo]()
$300
This Copa Airlines deal was found by Cheapflights users on 9/4. 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 Copa Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/268:00 am -
2 stops26h 04m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![Copa Airlines logo]()
$301
This Southwest deal was found by Cheapflights users on 9/4. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/25:00 am -
1 stop8h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![Southwest logo]()
$303
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 September 9, 2026.
Most accurate provider | Ovago 3 stars |
|---|---|
Most trusted provider | Ovago 3 stars |
Round-trip from | $382 (Air Canada) |
One-way from | $203 (American Airlines) |
Popular in | December |
Cheapest in | January |
Average price | $576 |
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 7,457,451 searches. Data last updated September 9, 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. LouisSan José
STL Lambert-St Louis - SJO San José Juan Santamaria Intl
STLSJO
Lambert-St Louis
Mon 10/12
6:35 pm-7:55 am
2 stops38h 20m
San José Juan Santamaria Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$232
St. LouisSan José
STL Lambert-St Louis - SJO San José Juan Santamaria Intl
STLSJO
Lambert-St Louis
Mon 10/12
5:40 am-2:00 pm
1 stop9h 20m
San José Juan Santamaria Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$256
St. LouisSan José
STL Lambert-St Louis - SJO San José Juan Santamaria Intl
STLSJO
Lambert-St Louis
Fri 10/2
2:29 pm-7:55 am
2 stops18h 26m
San José Juan Santamaria Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$286
Quickest round-trip
St. LouisLiberia
STL Lambert-St Louis - LIR Liberia
STLLIR
Lambert-St Louis
Fri 10/30
6:00 am-11:45 am
1 stop6h 45m
Liberia
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$292
St. LouisSan José
STL Lambert-St Louis - SJO San José Juan Santamaria Intl
STLSJO
Lambert-St Louis
Sun 10/11
6:15 am-7:37 pm
1 stop14h 22m
San José Juan Santamaria Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$294
St. LouisLiberia
STL Lambert-St Louis - LIR Liberia
STLLIR
Lambert-St Louis
Fri 10/30
9:00 pm-12:45 pm
2 stops16h 45m
Liberia
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$298
St. LouisSan José
STL Lambert-St Louis - SJO San José Juan Santamaria Intl
STLSJO
Lambert-St Louis
Sun 10/11
6:00 am-8:21 pm
2 stops15h 21m
San José Juan Santamaria Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$300
St. LouisSan José
STL Lambert-St Louis - SJO San José Juan Santamaria Intl
STLSJO
Lambert-St Louis
Sat 9/26
8:00 am-9:04 am
2 stops26h 04m
San José Juan Santamaria Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$301
St. LouisSan José
STL Lambert-St Louis - SJO San José Juan Santamaria Intl
STLSJO
Lambert-St Louis
Fri 10/2
5:00 am-12:35 pm
1 stop8h 35m
San José Juan Santamaria Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$303
St. LouisLiberia
STL Lambert-St Louis - LIR Liberia
STLLIR
Lambert-St Louis
Sat 12/5
5:16 pm-12:33 pm
2 stops19h 17m
Liberia
Fri 12/11
1:33 pm-11:58 pm
2 stops10h 25m
$411
Showing 1-10 of 25 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-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, February is the cheapest month in which you can book a flight from St. Louis to Costa Rica (average of $474). Flying from St. Louis to Costa Rica in December is currently the most expensive (average of $888). 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 77 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 September 9, 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.
Food
7.0
Boarding
8.1
Overall
8.0
Crew
8.6
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
4.0
OkaySteven,Sep 2026
OGG - HNL
Food
7.0
Boarding
8.1
Overall
8.0
Crew
8.6
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
4.0
OkaySteven,Sep 2026
OGG - HNL
Food
7.0
Boarding
8.1
Overall
8.0
Crew
8.6
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
4.0
OkaySteven,Sep 2026
OGG - HNL
Food
7.0
Boarding
8.1
Overall
8.0
Crew
8.6
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
4.0
OkaySteven,Sep 2026
OGG - HNL
Food
7.0
Boarding
8.1
Overall
8.0
Crew
8.6
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
4.0
OkaySteven,Sep 2026
OGG - HNL
Food
7.0
Boarding
8.1
Overall
8.0
Crew
8.6
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
4.0
OkaySteven,Sep 2026
OGG - HNL
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 September 9, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
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 7,457,451 searches. Data last updated September 9, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$320 | Average$663 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$334 | Average$585 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$359 | Average$579 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$400 | Average$767 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$628 | Average$1,039 | FlexibilityNo cancel fee | On-time74% |