$131+ Cheap flights from St. Louis (STL) to Luis Munoz Marin Intl (SJU)
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 9/23. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SJU
Jul 24 — Jul 311
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 Luis Munoz Marin IntlExplore the most affordable flight options available from St. Louis to Luis Munoz Marin Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 24, 2026.
Explore the most affordable flight options available from St. Louis to Luis Munoz Marin Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 24, 2026.
This Southwest deal was found by Cheapflights users on 6/23. 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.
Sat 11/710:55 am
STL
- SJU
Nonstop4h 20m
Southwest
Sat 11/1410:55 am
SJU
- STL
Nonstop5h 00m
Southwest
Deal found 6/23![Southwest logo]()
$327
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/124:57 pm
STL
- SJU
2 stops30h 44m
Frontier
Wed 8/198:57 pm
SJU
- STL
1 stop20h 14m
Frontier
Deal found 6/22![Frontier logo]()
$329
This Southwest deal was found by Cheapflights users on 6/23. 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.
Fri 9/1811:40 am
STL
- SJU
1 stop10h 10m
Southwest
Sat 9/195:05 am
SJU
- STL
1 stop7h 00m
Southwest
Deal found 6/23![Southwest logo]()
$331
This Southwest deal was found by Cheapflights users on 6/21. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/182:25 pm
STL
- SJU
1 stop6h 45m
Southwest
Tue 9/221:20 pm
SJU
- STL
1 stop7h 35m
Southwest
Deal found 6/21![Southwest logo]()
$336
This American Airlines deal was found by Cheapflights users on 6/23. 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 9/23:25 pm
STL
- SJU
1 stop7h 34m
American Airlines
Wed 9/96:27 am
SJU
- STL
2 stops12h 03m
American Airlines
Deal found 6/23![American Airlines logo]()
$341
This Kiwi.com deal was found by Cheapflights users on 6/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/84:57 pm
STL
- SJU
2 stops30h 44m
Frontier
Tue 8/1112:13 pm
SJU
- STL
1 stop12h 46m
Frontier
Deal found 6/23![Frontier logo]()
$348
This Kiwi.com deal was found by Cheapflights users on 6/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/410:35 am
STL
- SJU
2 stops12h 03m
Frontier
Fri 10/93:51 pm
SJU
- STL
1 stop18h 49m
Frontier
Deal found 6/20![Frontier logo]()
$356
This Kiwi.com deal was found by Cheapflights users on 6/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1110:35 am
STL
- SJU
2 stops12h 15m
Frontier
Mon 9/146:05 am
SJU
- STL
1 stop14h 34m
Frontier
Deal found 6/23![Frontier logo]()
$358
This Kiwi.com deal was found by Cheapflights users on 6/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/283:41 pm
STL
- SJU
1 stop12h 21m
Frontier
Tue 8/46:45 am
SJU
- STL
2 stops27h 12m
Frontier
Deal found 6/20![Frontier logo]()
$359
This Kiwi.com deal was found by Cheapflights users on 6/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/54:57 pm
STL
- SJU
2 stops30h 44m
Frontier
Sun 8/95:15 pm
SJU
- STL
1 stop16h 42m
Frontier
Deal found 6/21![Frontier logo]()
$361
This Kiwi.com deal was found by Cheapflights users on 6/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/174:57 pm
STL
- SJU
2 stops30h 44m
Frontier
Tue 7/215:15 pm
SJU
- STL
1 stop16h 42m
Frontier
Deal found 6/21![Frontier logo]()
$362
Best flights from St. Louis to Luis Munoz Marin IntlDiscover carefully curated flight deals from St. Louis to Luis Munoz Marin Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 24, 2026.
Discover carefully curated flight deals from St. Louis to Luis Munoz Marin Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 24, 2026.
This Southwest deal was found by Cheapflights users on 6/23. 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.
Sat 11/710:55 am
STL
- SJU
Nonstop4h 20m
Southwest
Sat 11/1410:55 am
SJU
- STL
Nonstop5h 00m
Southwest
Deal found 6/23![Southwest logo]()
$327
This Delta deal was found by Cheapflights users on 6/19. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/26:00 am
STL
- SJU
1 stop9h 38m
Delta
Wed 9/97:00 am
SJU
- STL
1 stop6h 32m
Delta
Deal found 6/19![Delta logo]()
$336
This United Airlines deal was found by Cheapflights users on 6/23. 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.
Sat 11/71:24 pm
STL
- SJU
1 stop6h 58m
United Airlines
Fri 11/132:05 am
SJU
- STL
2 stops12h 01m
United Airlines
Deal found 6/23![United Airlines logo]()
$336
This Delta deal was found by Cheapflights users on 6/21. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2112:52 pm
STL
- SJU
1 stop8h 37m
Delta
Tue 8/257:00 am
SJU
- STL
1 stop8h 33m
Delta
Deal found 6/21![Delta logo]()
$336
This Southwest deal was found by Cheapflights users on 6/23. 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.
Thu 11/55:00 am
STL
- SJU
1 stop10h 00m
Southwest
Sun 11/82:20 pm
SJU
- STL
1 stop11h 25m
Southwest
Deal found 6/23![Southwest logo]()
$367
This Southwest deal was found by Cheapflights users on 6/22. 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 11/18:20 pm
STL
- SJU
1 stop12h 10m
Southwest
Fri 11/62:20 pm
SJU
- STL
1 stop10h 40m
Southwest
Deal found 6/22![Southwest logo]()
$367
This Delta deal was found by Cheapflights users on 6/23. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1012:52 pm
STL
- SJU
1 stop8h 37m
Delta
Tue 8/1812:56 pm
SJU
- STL
1 stop11h 25m
Delta
Deal found 6/23![Delta logo]()
$392
This Southwest deal was found by Cheapflights users on 6/22. 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.
Fri 9/43:15 pm
STL
- SJU
2 stops7h 35m
Southwest
Mon 9/78:55 pm
SJU
- STL
1 stop11h 45m
Southwest
Deal found 6/22![Southwest logo]()
$398
This Southwest deal was found by Cheapflights users on 6/21. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/102:25 pm
STL
- SJU
1 stop8h 25m
Southwest
Tue 8/182:25 pm
SJU
- STL
1 stop7h 45m
Southwest
Deal found 6/21![Southwest logo]()
$400
Last-minute flights from St. Louis to Luis Munoz Marin IntlDiscover last-minute flight deals from St. Louis to Luis Munoz Marin Intl. Data last updated June 24, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Luis Munoz Marin Intl. Data last updated June 24, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 6/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/174:57 pm
STL
- SJU
2 stops30h 44m
Frontier
Tue 7/215:15 pm
SJU
- STL
1 stop16h 42m
Frontier
Deal found 6/21![Frontier logo]()
$362
This Kiwi.com deal was found by Cheapflights users on 6/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/184:57 pm
STL
- SJU
2 stops43h 58m
Frontier
Wed 7/295:15 pm
SJU
- STL
1 stop25h 22m
Frontier
Deal found 6/20![Frontier logo]()
$373
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/204:57 pm
STL
- SJU
2 stops30h 44m
Frontier
Wed 7/295:15 pm
SJU
- STL
1 stop25h 22m
Frontier
Deal found 6/22![Frontier logo]()
$381
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/204:57 pm
STL
- SJU
2 stops30h 44m
Frontier
Thu 7/305:15 pm
SJU
- STL
1 stop16h 42m
Frontier
Deal found 6/22![Frontier logo]()
$385
This Super.com deal was found by Cheapflights users on 6/22. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/224:09 pm
STL
- SJU
1 stop9h 06m
Frontier
Wed 7/294:08 pm
SJU
- STL
1 stop8h 51m
Frontier
Deal found 6/22![Frontier logo]()
$376
This Kiwi.com deal was found by Cheapflights users on 6/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/236:34 pm
STL
- SJU
2 stops42h 26m
Frontier
Wed 7/295:15 pm
SJU
- STL
1 stop25h 22m
Frontier
Deal found 6/19![Frontier logo]()
$372
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/244:57 pm
STL
- SJU
2 stops30h 44m
Frontier
Thu 7/305:15 pm
SJU
- STL
1 stop16h 42m
Frontier
Deal found 6/22![Frontier logo]()
$365
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/244:57 pm
STL
- SJU
2 stops30h 44m
Frontier
Fri 7/315:15 pm
SJU
- STL
1 stop16h 42m
Frontier
Deal found 6/22![Frontier logo]()
$367
This Kiwi.com deal was found by Cheapflights users on 6/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/244:57 pm
STL
- SJU
2 stops30h 44m
Frontier
Sun 8/28:37 pm
SJU
- STL
1 stop28h 22m
Frontier
Deal found 6/21![Frontier logo]()
$374
This Kiwi.com deal was found by Cheapflights users on 6/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/283:41 pm
STL
- SJU
1 stop12h 21m
Frontier
Tue 8/46:45 am
SJU
- STL
2 stops27h 12m
Frontier
Deal found 6/20![Frontier logo]()
$359
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/314:57 pm
STL
- SJU
2 stops44h 03m
Frontier
Thu 8/65:15 pm
SJU
- STL
1 stop16h 42m
Frontier
Deal found 6/22![Frontier logo]()
$382
One-way flights from St. Louis to Luis Munoz Marin IntlSearch for one-way flight options from St. Louis to Luis Munoz Marin Intl. Find affordable one-way fares based on user searches. Data last updated June 24, 2026.
Search for one-way flight options from St. Louis to Luis Munoz Marin Intl. Find affordable one-way fares based on user searches. Data last updated June 24, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/2310:35 am
STL
- SJU
2 stops12h 22m
Frontier
Deal found 6/23![Frontier logo]()
$131
This Kiwi.com deal was found by Cheapflights users on 6/24. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/216:17 pm
STL
- SJU
2 stops29h 39m
Frontier
Deal found 6/24![Frontier logo]()
$141
This Kiwi.com deal was found by Cheapflights users on 6/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1610:35 am
STL
- SJU
2 stops12h 22m
Frontier
Deal found 6/21![Frontier logo]()
$142
This Kiwi.com deal was found by Cheapflights users on 6/24. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/206:17 pm
STL
- SJU
2 stops29h 39m
Frontier
Deal found 6/24![Frontier logo]()
$143
This Kiwi.com deal was found by Cheapflights users on 6/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/104:57 pm
STL
- SJU
2 stops43h 44m
Frontier
Deal found 6/19![Frontier logo]()
$151
This Kiwi.com deal was found by Cheapflights users on 6/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/174:57 pm
STL
- SJU
2 stops43h 58m
Frontier
Deal found 6/23![Frontier logo]()
$152
This Kiwi.com deal was found by Cheapflights users on 6/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1910:35 am
STL
- SJU
2 stops29h 10m
Frontier
Deal found 6/23![Frontier logo]()
$153
This Kiwi.com deal was found by Cheapflights users on 6/24. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/184:57 pm
STL
- SJU
2 stops43h 58m
Frontier
Deal found 6/24![Frontier logo]()
$154
This Kiwi.com deal was found by Cheapflights users on 6/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/174:57 pm
STL
- SJU
2 stops22h 14m
Frontier
Deal found 6/20![Frontier logo]()
$159
This Southwest deal was found by Cheapflights users on 6/19. 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.
Tue 8/2510:15 am
STL
- SJU
2 stops9h 50m
Southwest
Deal found 6/19![Southwest logo]()
$168
This Kiwi.com deal was found by Cheapflights users on 6/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/166:34 pm
STL
- SJU
2 stops20h 37m
Frontier
Deal found 6/20![Frontier logo]()
$170
This Kiwi.com deal was found by Cheapflights users on 6/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2210:35 am
STL
- SJU
2 stops12h 22m
Frontier
Deal found 6/23![Frontier logo]()
$171
Find flight deals from St. Louis to Luis Munoz Marin Intl
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Luis Munoz Marin Intl (SJU). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated June 24, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $327 (Southwest) |
One-way from | $131 (Kiwi.com) |
Popular in | December |
Cheapest in | September |
Average price | $475 |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Luis Munoz Marin Intl 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 June 24, 2026.
Use the filters below to find and compare flights from St. Louis to San Juan Luis Munoz Marin Intl Airport that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Sat 11/7
10:55 am-5:15 pm
Nonstop4h 20m
San Juan Luis Munoz Marin Intl
Sat 11/14
10:55 am-1:55 pm
Nonstop5h 00m
$327
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Wed 9/2
6:00 am-4:38 pm
1 stop9h 38m
San Juan Luis Munoz Marin Intl
Wed 9/9
7:00 am-12:32 pm
1 stop6h 32m
$336
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Sat 11/7
1:24 pm-10:22 pm
1 stop6h 58m
San Juan Luis Munoz Marin Intl
Fri 11/13
2:05 am-12:06 pm
2 stops12h 01m
$336
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Fri 8/21
12:52 pm-10:29 pm
1 stop8h 37m
San Juan Luis Munoz Marin Intl
Tue 8/25
7:00 am-2:33 pm
1 stop8h 33m
$336
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Thu 11/5
5:00 am-5:00 pm
1 stop10h 00m
San Juan Luis Munoz Marin Intl
Sun 11/8
2:20 pm-11:45 pm
1 stop11h 25m
$367
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Sun 11/1
8:20 pm-10:30 am
1 stop12h 10m
San Juan Luis Munoz Marin Intl
Fri 11/6
2:20 pm-11:00 pm
1 stop10h 40m
$367
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Mon 8/10
12:52 pm-10:29 pm
1 stop8h 37m
San Juan Luis Munoz Marin Intl
Tue 8/18
12:56 pm-11:21 pm
1 stop11h 25m
$392
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Fri 9/4
3:15 pm-11:50 pm
2 stops7h 35m
San Juan Luis Munoz Marin Intl
Mon 9/7
8:55 pm-7:40 am
1 stop11h 45m
$398
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Mon 8/10
2:25 pm-11:50 pm
1 stop8h 25m
San Juan Luis Munoz Marin Intl
Tue 8/18
2:25 pm-9:10 pm
1 stop7h 45m
$400
Cheapest one-way
Quickest one-way
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Tue 8/25
3:25 pm-11:59 pm
1 stop7h 34m
$168
Showing 1-10 of 20 resultsSorted by cheapest first
Compare providers for flights from St. Louis to Luis Munoz Marin Intl
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Luis Munoz Marin Intl in June.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*1 star | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on St. Louis-San Juan Luis Munoz Marin Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-San Juan Luis Munoz Marin Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-San Juan Luis Munoz Marin Intl Airport flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-San Juan Luis Munoz Marin Intl Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-San Juan Luis Munoz Marin Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from St. Louis to Luis Munoz Marin Intl
Have a flexible travel schedule? Discover the best time to fly to Luis Munoz Marin Intl from St. Louis with our price prediction graph.
STL-SJU
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 San Juan Luis Munoz Marin Intl Airport
Prices
Delays
More
How far ahead should I book a flight from St. Louis to San Juan Luis Munoz Marin Intl Airport?
Booking 17 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis to San Juan Luis Munoz Marin Intl Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
What is the cheapest month to book a flight from St. Louis to San Juan Luis Munoz Marin Intl Airport?
Currently, September is the cheapest month in which you can book a flight from St. Louis to San Juan Luis Munoz Marin Intl Airport (average of $298). Flying from St. Louis to San Juan Luis Munoz Marin Intl Airport in December is currently the most expensive (average of $612). 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.
What is the cheapest time of day to fly from STL to SJU?
Find hourly flight availability from St. Louis to Luis Munoz Marin Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 24, 2026.
When flying from St. Louis to San Juan Luis Munoz Marin Intl Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
How often are flights from St. Louis to San Juan delayed?
About 32% of weekly flights between St. Louis and San Juan have experienced delays in the past year, with the average delay time being 94 minutes.
What is the most punctual flight time for St. Louis to San Juan flights?
Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Saturday tends to have the lowest number of delays on this route, whereas Monday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on St. Louis to San Juan flights?
Over the last year, Southwest have had the lowest number of delays on this route, with just 31% of flights being delayed.
What’s the top layover airport for flights from St. Louis to San Juan Luis Munoz Marin Intl Airport?
Share of 1-stop round-trip flights from St. Louis to San Juan Luis Munoz Marin Intl Airport chosen by Cheapflights users in the past 12 months, using the same layover each way.
Orlando (MCO) – chosen by Cheapflights users on 45% of 1-stop itineraries from St. Louis to San Juan Luis Munoz Marin Intl Airport on Cheapflights.
What’s the cheapest layover airport for flights from St. Louis to San Juan Luis Munoz Marin Intl Airport?
Average round-trip fare for 1-stop flights from St. Louis to San Juan Luis Munoz Marin Intl Airport, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Chicago (ORD) is the most affordable 1-stop option, with an average round-trip price of $273.
What’s the fastest layover option from St. Louis to San Juan Luis Munoz Marin Intl Airport?
Shortest average travel time for 1-stop one-way flights from St. Louis to San Juan Luis Munoz Marin Intl Airport, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.
Flights via Chicago (ORD) have the shortest average one-way travel time for 1-stop routes: 6h 43m.
Which airport typically offers the quickest layover for flights from St. Louis to San Juan Luis Munoz Marin Intl Airport?
Average layover duration for 1-stop one-way flights from St. Louis to San Juan Luis Munoz Marin Intl Airport, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Chicago (ORD) offer the fastest connection on this route, with an average layover time of 1h 30m.
Reviews of airlines servicing Luis Munoz Marin Intl
Get insights into the airlines that provide service to Luis Munoz Marin Intl. 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 Luis Munoz Marin Intl. Reviews last updated June 24, 2026.
Read through reviews of airlines operating flights from St. Louis to San Juan Luis Munoz Marin Intl Airport, 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
Overall
7.9
Crew
8.6
Food
7.0
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Overall
7.9
Crew
8.6
Food
7.0
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Overall
7.9
Crew
8.6
Food
7.0
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Overall
7.9
Crew
8.6
Food
7.0
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Overall
7.9
Crew
8.6
Food
7.0
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Overall
7.9
Crew
8.6
Food
7.0
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Luis Munoz Marin Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near San Juan Luis Munoz Marin Intl Airport?
Book flights to San Juan Luis Munoz Marin Intl Airport if you plan to visit one of these locationsFajardo
Luquillo
Rio Grande
Dorado
Humacao
Bayamón
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Top 5 airlines flying from St. Louis to Luis Munoz Marin Intl
Discover the top 5 airlines that operate flights from St. Louis to Luis Munoz Marin Intl. 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 June 24, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$138 | Average$326 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$205 | Average$382 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$225 | Average$406 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$246 | Average$487 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$250 | Average$498 | FlexibilityNo cancel fee | On-time71% |