$160+ Cheap flights from St. Louis (STL) to San Juan
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 8/12. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SJU
Jul 12 — Jul 191
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 San JuanExplore the most affordable flight options available from St. Louis to San Juan. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2026.
Explore the most affordable flight options available from St. Louis to San Juan. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2026.
This Delta deal was found by Cheapflights users on 6/8. 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 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 6/8![Delta logo]()
$336
This American Airlines deal was found by Cheapflights users on 6/10. 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 6/10![American Airlines logo]()
$341
This United Airlines deal was found by Cheapflights users on 6/9. 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 9/66:00 am
STL
- SJU
1 stop7h 44m
United Airlines
Sat 9/121:00 am
SJU
- STL
2 stops10h 12m
United Airlines
Deal found 6/9![United Airlines logo]()
$346
This Southwest deal was found by Cheapflights users on 6/10. 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 10/292:05 pm
STL
- SJU
2 stops9h 30m
Southwest
Tue 11/36:45 am
SJU
- STL
2 stops14h 35m
Southwest
Deal found 6/10![Southwest logo]()
$356
This United Airlines deal was found by Cheapflights users on 6/11. 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 9/68:00 am
STL
- SJU
2 stops11h 38m
United Airlines
Fri 9/111:00 am
SJU
- STL
2 stops12h 03m
United Airlines
Deal found 6/11![United Airlines logo]()
$359
This American Airlines deal was found by Cheapflights users on 6/10. 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 8/306:00 am
STL
- SJU
2 stops9h 57m
American Airlines
Thu 9/31:38 pm
SJU
- STL
2 stops10h 02m
American Airlines
Deal found 6/10![American Airlines logo]()
$361
This Southwest deal was found by Cheapflights users on 6/9. 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 9/34:55 pm
STL
- SJU
1 stop5h 55m
Southwest
Mon 9/78:55 pm
SJU
- STL
1 stop11h 45m
Southwest
Deal found 6/9![Southwest logo]()
$376
This Southwest deal was found by Cheapflights users on 6/7. 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.
Sun 10/255:00 am
STL
- SJU
1 stop7h 45m
Southwest
Thu 10/296:30 am
SJU
- STL
2 stops9h 40m
Southwest
Deal found 6/7![Southwest logo]()
$381
This Kiwi.com deal was found by Cheapflights users on 6/10. 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 8/26:34 pm
STL
- SJU
2 stops42h 26m
Frontier
Sun 8/95:15 pm
SJU
- STL
1 stop16h 42m
Frontier
Deal found 6/10![Frontier logo]()
$382
This Kiwi.com deal was found by Cheapflights users on 6/11. 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 7/286:34 pm
STL
- SJU
1 stop18h 42m
Frontier
Mon 8/106:26 am
SJU
- STL
2 stops36h 11m
Frontier
Deal found 6/11![Frontier logo]()
$384
This Kiwi.com deal was found by Cheapflights users on 6/9. 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 8/34:57 pm
STL
- SJU
2 stops43h 44m
Frontier
Sun 8/95:15 pm
SJU
- STL
1 stop16h 42m
Frontier
Deal found 6/9![Frontier logo]()
$388
Best flights from St. Louis to San JuanDiscover carefully curated flight deals from St. Louis to San Juan that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 12, 2026.
Discover carefully curated flight deals from St. Louis to San Juan that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 12, 2026.
This Southwest deal was found by Cheapflights users on 6/12. 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 8/163:30 pm
STL
- SJU
1 stop8h 00m
Southwest
Sat 8/2210:25 am
SJU
- STL
1 stop10h 20m
Southwest
Deal found 6/12![Southwest logo]()
$336
This Delta deal was found by Cheapflights users on 6/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2410:00 am
STL
- SJU
1 stop11h 00m
Delta
Wed 9/307:30 am
SJU
- STL
1 stop11h 10m
Delta
Deal found 6/8![Delta logo]()
$336
This Southwest deal was found by Cheapflights users on 6/12. 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 10/226:30 am
STL
- SJU
1 stop10h 40m
Southwest
Mon 10/261:05 pm
SJU
- STL
1 stop8h 25m
Southwest
Deal found 6/12![Southwest logo]()
$336
This Delta deal was found by Cheapflights users on 6/8. 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 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 9/97:30 am
SJU
- STL
1 stop8h 08m
Delta
Deal found 6/8![Delta logo]()
$336
This Southwest deal was found by Cheapflights users on 6/12. 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 8/219:15 am
STL
- SJU
1 stop9h 50m
Southwest
Tue 8/2511:50 am
SJU
- STL
1 stop9h 05m
Southwest
Deal found 6/12![Southwest logo]()
$336
This Southwest deal was found by Cheapflights users on 6/11. 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 10/21:50 pm
STL
- SJU
1 stop6h 05m
Southwest
Tue 10/66:10 am
SJU
- STL
2 stops14h 25m
Southwest
Deal found 6/11![Southwest logo]()
$336
This Southwest deal was found by Cheapflights users on 6/7. 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.
Sun 10/256:45 am
STL
- SJU
2 stops8h 45m
Southwest
Thu 10/296:30 am
SJU
- STL
2 stops9h 40m
Southwest
Deal found 6/7![Southwest logo]()
$381
This Southwest deal was found by Cheapflights users on 6/8. 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.
Thu 10/2210:15 am
STL
- SJU
2 stops9h 40m
Southwest
Sat 10/315:30 am
SJU
- STL
1 stop10h 20m
Southwest
Deal found 6/8![Southwest logo]()
$381
This Southwest deal was found by Cheapflights users on 6/9. 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 11/68:20 pm
STL
- SJU
1 stop11h 40m
Southwest
Wed 11/115:45 am
SJU
- STL
2 stops9h 55m
Southwest
Deal found 6/9![Southwest logo]()
$396
Last-minute flights from St. Louis to San JuanDiscover last-minute flight deals from St. Louis to San Juan. Data last updated June 12, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to San Juan. Data last updated June 12, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 6/11. 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 7/26:31 pm
STL
- SJU
2 stops42h 58m
Frontier
Tue 7/75:15 pm
SJU
- STL
1 stop16h 42m
Frontier
Deal found 6/11![Frontier logo]()
$410
This Delta deal was found by Cheapflights users on 6/12. 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 7/410:16 am
STL
- SJU
1 stop11h 11m
Delta
Thu 7/92:42 pm
SJU
- STL
1 stop10h 11m
Delta
Deal found 6/12![Delta logo]()
$376
This Southwest deal was found by Cheapflights users on 6/8. 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.
Sat 7/41:25 pm
STL
- SJU
1 stop6h 35m
Southwest
Thu 7/910:20 pm
SJU
- STL
1 stop11h 00m
Southwest
Deal found 6/8![Southwest logo]()
$401
This Priceline deal was found by Cheapflights users on 6/11. 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 7/113:41 pm
STL
- SJU
1 stop12h 21m
Frontier
Fri 7/1710:48 pm
SJU
- STL
1 stop26h 11m
Frontier
Deal found 6/11![Frontier logo]()
$416
This American Airlines deal was found by Cheapflights users on 6/11. 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 7/155:10 am
STL
- SJU
1 stop16h 49m
American Airlines
Mon 7/277:14 pm
SJU
- STL
1 stop16h 10m
American Airlines
Deal found 6/11![American Airlines logo]()
$418
This Kiwi.com deal was found by Cheapflights users on 6/10. 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
Wed 7/225:15 pm
SJU
- STL
1 stop25h 22m
Frontier
Deal found 6/10![Frontier logo]()
$393
This CheapOair deal was found by Cheapflights users on 6/7. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/194:09 pm
STL
- SJU
1 stop14h 48m
Frontier
Fri 7/316:09 pm
SJU
- STL
1 stop6h 50m
Frontier
Deal found 6/7![Frontier logo]()
$426
This American Airlines deal was found by Cheapflights users on 6/11. 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 7/205:18 am
STL
- SJU
1 stop9h 29m
American Airlines
Mon 7/277:14 pm
SJU
- STL
1 stop16h 10m
American Airlines
Deal found 6/11![American Airlines logo]()
$413
This Flightnetwork deal was found by Cheapflights users on 6/11. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/204:09 pm
STL
- SJU
1 stop9h 06m
Frontier
Mon 7/278:37 pm
SJU
- STL
1 stop28h 22m
Frontier
Deal found 6/11![Frontier logo]()
$417
This Kiwi.com deal was found by Cheapflights users on 6/10. 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 7/254:57 pm
STL
- SJU
2 stops44h 03m
Frontier
Fri 7/315:15 pm
SJU
- STL
1 stop16h 42m
Frontier
Deal found 6/10![Frontier logo]()
$400
This Kiwi.com deal was found by Cheapflights users on 6/11. 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 7/286:34 pm
STL
- SJU
1 stop18h 42m
Frontier
Mon 8/106:26 am
SJU
- STL
2 stops36h 11m
Frontier
Deal found 6/11![Frontier logo]()
$384
This Priceline deal was found by Cheapflights users on 6/11. 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.
Tue 7/283:41 pm
STL
- SJU
1 stop12h 21m
Frontier
Mon 8/310:48 pm
SJU
- STL
1 stop26h 11m
Frontier
Deal found 6/11![Frontier logo]()
$396
One-way flights from St. Louis to San JuanSearch for one-way flight options from St. Louis to San Juan. Find affordable one-way fares based on user searches. Data last updated June 12, 2026.
Search for one-way flight options from St. Louis to San Juan. Find affordable one-way fares based on user searches. Data last updated June 12, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/12. 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 stops43h 44m
Frontier
Deal found 6/12![Frontier logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 6/9. 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 8/256:33 pm
STL
- SJU
2 stops42h 56m
Frontier
Deal found 6/9![Frontier logo]()
$163
This Kiwi.com deal was found by Cheapflights users on 6/10. 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 8/74:57 pm
STL
- SJU
2 stops43h 44m
Frontier
Deal found 6/10![Frontier logo]()
$164
This Kiwi.com deal was found by Cheapflights users on 6/10. 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 8/46:34 pm
STL
- SJU
2 stops42h 07m
Frontier
Deal found 6/10![Frontier logo]()
$166
This Delta deal was found by Cheapflights users on 6/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/2511:00 am
STL
- SJU
1 stop10h 29m
Delta
Deal found 6/8![Delta logo]()
$168
This Kiwi.com deal was found by Cheapflights users on 6/10. 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 8/66:34 pm
STL
- SJU
2 stops42h 07m
Frontier
Deal found 6/10![Frontier logo]()
$170
This Kiwi.com deal was found by Cheapflights users on 6/7. 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.
Sat 8/14:57 pm
STL
- SJU
2 stops44h 03m
Frontier
Deal found 6/7![Frontier logo]()
$171
This American Airlines deal was found by Cheapflights users on 6/9. 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 8/216:00 am
STL
- SJU
2 stops11h 34m
American Airlines
Deal found 6/9![American Airlines logo]()
$172
This American Airlines deal was found by Cheapflights users on 6/8. 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 8/58:34 am
STL
- SJU
1 stop14h 25m
American Airlines
Deal found 6/8![American Airlines logo]()
$173
This Kiwi.com deal was found by Cheapflights users on 6/9. 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 8/34:57 pm
STL
- SJU
2 stops43h 44m
Frontier
Deal found 6/9![Frontier logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 6/7. 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.
Wed 8/54:57 pm
STL
- SJU
2 stops43h 44m
Frontier
Deal found 6/7![Frontier logo]()
$180
This Kiwi.com deal was found by Cheapflights users on 6/12. 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 8/113:41 pm
STL
- SJU
2 stops31h 47m
Frontier
Deal found 6/12![Frontier logo]()
$181
Find flight deals from St. Louis to San Juan
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to San Juan (PR1). 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 12, 2026.
Round-trip from | $336 (Delta) |
|---|---|
One-way from | $160 (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 San Juan 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 12, 2026.
Use the filters below to find and compare flights from St. Louis to San Juan that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Sun 8/16
3:30 pm-12:30 am
1 stop8h 00m
San Juan Luis Munoz Marin Intl
Sat 8/22
10:25 am-7:45 pm
1 stop10h 20m
$336
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Thu 9/24
10:00 am-10:00 pm
1 stop11h 00m
San Juan Luis Munoz Marin Intl
Wed 9/30
7:30 am-5:40 pm
1 stop11h 10m
$336
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Thu 10/22
6:30 am-6:10 pm
1 stop10h 40m
San Juan Luis Munoz Marin Intl
Mon 10/26
1:05 pm-8:30 pm
1 stop8h 25m
$336
Quickest round-trip
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
7:30 am-2:38 pm
1 stop8h 08m
$336
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Fri 8/21
9:15 am-8:05 pm
1 stop9h 50m
San Juan Luis Munoz Marin Intl
Tue 8/25
11:50 am-7:55 pm
1 stop9h 05m
$336
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Fri 10/2
1:50 pm-8:55 pm
1 stop6h 05m
San Juan Luis Munoz Marin Intl
Tue 10/6
6:10 am-7:35 pm
2 stops14h 25m
$336
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Sun 10/25
6:45 am-4:30 pm
2 stops8h 45m
San Juan Luis Munoz Marin Intl
Thu 10/29
6:30 am-3:10 pm
2 stops9h 40m
$381
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Thu 10/22
10:15 am-8:55 pm
2 stops9h 40m
San Juan Luis Munoz Marin Intl
Sat 10/31
5:30 am-2:50 pm
1 stop10h 20m
$381
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Fri 11/6
8:20 pm-10:00 am
1 stop11h 40m
San Juan Luis Munoz Marin Intl
Wed 11/11
5:45 am-1:40 pm
2 stops9h 55m
$396
Cheapest one-way
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Tue 8/4
6:34 pm-1:41 pm
2 stops42h 07m
$166
Showing 1-10 of 21 resultsSorted by cheapest first
Best time to book a flight from St. Louis to San Juan
Have a flexible travel schedule? Discover the best time to fly to San Juan from St. Louis with our price prediction graph.
STL-PR1
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
STL-PR1
STL-SJU
What is the cheapest month to book a flight from St. Louis to San Juan?
Currently, July is the cheapest month in which you can book a flight from St. Louis to San Juan (average of $104). Flying from St. Louis to San Juan in August is currently the most expensive (average of $219). 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 San Juan. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 12, 2026.
When flying from St. Louis to San Juan, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
How much does it cost to fly round-trip from St. Louis to San Juan?
How often are flights from St. Louis to San Juan delayed?
About 33% of weekly flights between St. Louis and San Juan have experienced delays in the past year, with the average delay time being 92 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 32% of flights being delayed.
How far ahead should I book a flight from St. Louis to San Juan?
The price you pay for your flight from St. Louis to San Juan may vary depending on when you book. For the best chance of a lower fare, look to book 53 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
Reviews of airlines servicing San Juan
Get insights into the airlines that provide service to San Juan. 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 San Juan. Reviews last updated June 12, 2026.
Peruse reviews from past customers who have flown with Southwest,Delta, andUnited Airlines from St. Louis to San Juan to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
8.0
Boarding
8.1
Crew
8.6
Food
7.0
Overall
7.9
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Boarding
8.1
Crew
8.6
Food
7.0
Overall
7.9
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Boarding
8.1
Crew
8.6
Food
7.0
Overall
7.9
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Boarding
8.1
Crew
8.6
Food
7.0
Overall
7.9
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Boarding
8.1
Crew
8.6
Food
7.0
Overall
7.9
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Boarding
8.1
Crew
8.6
Food
7.0
Overall
7.9
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Related info for your journey
Find useful and relevant information for your journey from St. Louis to San Juan. 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 San Juan
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Complete your trip
Complete your trip to San Juan by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from St. Louis to San Juan by cabin class
Find flights from St. Louis to San Juan, based on your preferred cabin class, be it economy, premium economy, business, or first class.
St. Louis and San Juan flights
Browse other St. Louis and San Juan flight options. Last updated on June 12, 2026.
Other flights from St. Louis
Browse through other flights departing from St. Louis. Flights are based on user searches made on Cheapflights and were last updated on June 12, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 5 airlines flying from St. Louis to San Juan
Discover the top 5 airlines that operate flights from St. Louis to San Juan. 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 12, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$138 | Average$325 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$205 | Average$373 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$220 | Average$486 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$225 | Average$403 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$250 | Average$500 | FlexibilityNo cancel fee | On-time71% |