$158+ 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 8/27. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SJU
Jul 8 — Jul 151
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to San Juan with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Cheapest flights from St. Louis to 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 8, 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 8, 2026.
This United Airlines deal was found by Cheapflights users on 6/4. 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 10/176:15 am
STL
- SJU
1 stop8h 27m
United Airlines
Tue 10/201:00 am
SJU
- STL
2 stops12h 13m
United Airlines
Deal found 6/4![United Airlines logo]()
$316
This American Airlines deal was found by Cheapflights users on 6/4. 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 8/2210:22 am
STL
- SJU
1 stop12h 21m
American Airlines
Mon 8/317:24 pm
SJU
- STL
1 stop16h 21m
American Airlines
Deal found 6/4![American Airlines logo]()
$326
This American Airlines deal was found by Cheapflights users on 6/4. 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.
Wed 8/128:34 am
STL
- SJU
2 stops12h 21m
American Airlines
Sat 8/157:20 pm
SJU
- STL
1 stop16h 25m
American Airlines
Deal found 6/4![American Airlines logo]()
$331
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/218:34 am
STL
- SJU
1 stop14h 25m
American Airlines
Tue 8/253:47 pm
SJU
- STL
2 stops9h 27m
American Airlines
Deal found 6/7![American Airlines logo]()
$336
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/26:54 am
STL
- SJU
1 stop16h 05m
American Airlines
Wed 9/96:27 am
SJU
- STL
2 stops12h 03m
American Airlines
Deal found 6/7![American Airlines logo]()
$341
This Southwest deal was found by Cheapflights users on 6/5. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/102:25 pm
STL
- SJU
1 stop8h 25m
Southwest
Mon 9/145:00 am
SJU
- STL
1 stop6h 40m
Southwest
Deal found 6/5![Southwest logo]()
$346
This United Airlines deal was found by Cheapflights users on 6/3. 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 9/128:00 am
STL
- SJU
2 stops11h 38m
United Airlines
Sun 9/202:55 pm
SJU
- STL
1 stop9h 43m
United Airlines
Deal found 6/3![United Airlines logo]()
$349
This American Airlines deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/85:42 am
STL
- SJU
2 stops11h 52m
American Airlines
Fri 9/1110:16 am
SJU
- STL
2 stops13h 26m
American Airlines
Deal found 6/3![American Airlines logo]()
$361
This American Airlines deal was found by Cheapflights users on 6/3. 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 9/210:44 am
STL
- SJU
2 stops10h 11m
American Airlines
Sat 9/57:00 am
SJU
- STL
1 stop11h 01m
American Airlines
Deal found 6/3![American Airlines logo]()
$366
This United Airlines deal was found by Cheapflights users on 6/6. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/108:00 am
STL
- SJU
2 stops11h 38m
United Airlines
Sat 9/121:00 am
SJU
- STL
2 stops10h 12m
United Airlines
Deal found 6/6![United Airlines logo]()
$369
This Kiwi.com deal was found by Cheapflights users on 6/3. 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 9/34:10 pm
STL
- SJU
1 stop8h 44m
Frontier
Mon 9/74:05 pm
SJU
- STL
1 stop9h 09m
Frontier
Deal found 6/3![Frontier logo]()
$371
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 8, 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 8, 2026.
This United Airlines deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/811:15 am
STL
- SJU
1 stop8h 23m
United Airlines
Fri 9/112:55 pm
SJU
- STL
1 stop9h 43m
United Airlines
Deal found 6/3![United Airlines logo]()
$316
This Delta deal was found by Cheapflights users on 6/4. 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 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 9/305:41 pm
SJU
- STL
1 stop6h 55m
Delta
Deal found 6/4![Delta logo]()
$316
This Southwest deal was found by Cheapflights users on 6/3. 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 9/89:35 am
STL
- SJU
1 stop8h 25m
Southwest
Fri 9/1110:00 am
SJU
- STL
2 stops9h 25m
Southwest
Deal found 6/3![Southwest logo]()
$336
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/166:00 am
STL
- SJU
1 stop6h 42m
Delta
Tue 8/187:00 am
SJU
- STL
1 stop8h 33m
Delta
Deal found 6/7![Delta logo]()
$336
This Southwest deal was found by Cheapflights users on 6/5. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/102:25 pm
STL
- SJU
1 stop8h 25m
Southwest
Mon 9/145:00 am
SJU
- STL
1 stop6h 40m
Southwest
Deal found 6/5![Southwest logo]()
$346
This United Airlines deal was found by Cheapflights users on 6/6. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/108:00 am
STL
- SJU
2 stops11h 38m
United Airlines
Sat 9/121:00 am
SJU
- STL
2 stops10h 12m
United Airlines
Deal found 6/6![United Airlines logo]()
$369
This Southwest deal was found by Cheapflights users on 6/5. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/55:45 am
STL
- SJU
1 stop7h 15m
Southwest
Sat 12/1210:55 am
SJU
- STL
Nonstop5h 00m
Southwest
Deal found 6/5![Southwest logo]()
$419
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 8/1612:30 pm
STL
- SJU
2 stops9h 55m
Southwest
Tue 8/185:15 am
SJU
- STL
2 stops7h 55m
Southwest
Deal found 6/7![Southwest logo]()
$426
This United Airlines deal was found by Cheapflights users on 6/3. 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 10/269:23 am
STL
- SJU
2 stops10h 59m
United Airlines
Fri 10/307:30 am
SJU
- STL
2 stops11h 39m
United Airlines
Deal found 6/3![United Airlines logo]()
$571
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.
Wed 7/18:25 pm
STL
- SJU
1 stop11h 35m
Southwest
Sat 7/46:00 am
SJU
- STL
Nonstop4h 35m
Southwest
Deal found 6/7![Southwest logo]()
$524
This Southwest deal was found by Cheapflights users on 6/5. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/39:55 am
STL
- SJU
2 stops13h 25m
Southwest
Sat 8/85:05 am
SJU
- STL
2 stops8h 30m
Southwest
Deal found 6/5![Southwest logo]()
$535
This Southwest deal was found by Cheapflights users on 6/3. 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 7/99:55 am
STL
- SJU
2 stops13h 25m
Southwest
Wed 7/155:00 am
SJU
- STL
2 stops14h 25m
Southwest
Deal found 6/3![Southwest logo]()
$556
Last-minute flights from St. Louis to San JuanDiscover last-minute flight deals from St. Louis to San Juan. Data last updated June 8, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to San Juan. Data last updated June 8, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 6/4. 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 6/276:15 am
STL
- SJU
1 stop15h 45m
American Airlines
Mon 6/297:16 pm
SJU
- STL
1 stop16h 19m
American Airlines
Deal found 6/4![American Airlines logo]()
$386
This Kiwi.com deal was found by Cheapflights users on 6/3. 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 6/286:31 pm
STL
- SJU
2 stops28h 44m
Frontier
Mon 7/610:48 pm
SJU
- STL
1 stop26h 11m
Frontier
Deal found 6/3![Frontier logo]()
$407
This Priceline deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/14:17 pm
STL
- SJU
1 stop8h 52m
Frontier
Wed 7/88:37 pm
SJU
- STL
1 stop28h 22m
Frontier
Deal found 6/3![Frontier 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.
Sat 7/41:25 pm
STL
- SJU
1 stop6h 35m
Southwest
Thu 7/910:20 pm
SJU
- STL
1 stop13h 00m
Southwest
Deal found 6/7![Southwest logo]()
$381
This Kiwi.com deal was found by Cheapflights users on 6/3. 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 7/45:06 pm
STL
- SJU
1 stop20h 10m
Frontier
Tue 7/143:36 pm
SJU
- STL
2 stops33h 23m
Frontier
Deal found 6/3![Frontier logo]()
$395
This Kiwi.com deal was found by Cheapflights users on 6/3. 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 7/126:34 pm
STL
- SJU
1 stop18h 42m
Frontier
Wed 7/297:34 am
SJU
- STL
2 stops17h 25m
Frontier
Deal found 6/3![Frontier logo]()
$408
This Kiwi.com deal was found by Cheapflights users on 6/3. 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 7/146:34 pm
STL
- SJU
1 stop18h 42m
Frontier
Wed 7/297:34 am
SJU
- STL
2 stops17h 25m
Frontier
Deal found 6/3![Frontier logo]()
$405
This Kiwi.com deal was found by Cheapflights users on 6/5. 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.
Wed 7/154:57 pm
STL
- SJU
2 stops43h 58m
Frontier
Fri 7/315:15 pm
SJU
- STL
1 stop16h 42m
Frontier
Deal found 6/5![Frontier logo]()
$404
This Kiwi.com deal was found by Cheapflights users on 6/4. 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.
Sat 7/184:57 pm
STL
- SJU
2 stops43h 58m
Frontier
Fri 7/245:15 pm
SJU
- STL
1 stop16h 42m
Frontier
Deal found 6/4![Frontier logo]()
$409
This Kiwi.com deal was found by Cheapflights users on 6/3. 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 7/204:09 pm
STL
- SJU
1 stop18h 07m
Frontier
Wed 7/297:34 am
SJU
- STL
2 stops17h 25m
Frontier
Deal found 6/3![Frontier logo]()
$389
This Kiwi.com deal was found by Cheapflights users on 6/4. 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.
Tue 7/284:09 pm
STL
- SJU
1 stop24h 22m
Frontier
Mon 8/36:45 am
SJU
- STL
2 stops35h 52m
Frontier
Deal found 6/4![Frontier logo]()
$400
This Priceline deal was found by Cheapflights users on 6/6. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/304:09 pm
STL
- SJU
1 stop9h 06m
Frontier
Wed 8/54:08 pm
SJU
- STL
1 stop8h 51m
Frontier
Deal found 6/6![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 8, 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 8, 2026.
This Delta deal was found by Cheapflights users on 6/3. 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 8/256:00 am
STL
- SJU
1 stop6h 42m
Delta
Deal found 6/3![Delta logo]()
$158
This Delta deal was found by Cheapflights users on 6/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/316:00 am
STL
- SJU
1 stop6h 42m
Delta
Deal found 6/4![Delta logo]()
$163
This Kiwi.com deal was found by Cheapflights users on 6/4. 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.
Sat 8/14:57 pm
STL
- SJU
2 stops44h 03m
Frontier
Deal found 6/4![Frontier logo]()
$164
This Kiwi.com deal was found by Cheapflights users on 6/4. 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.
Sat 8/295:33 pm
STL
- SJU
2 stops43h 56m
Frontier
Deal found 6/4![Frontier logo]()
$166
This Delta deal was found by Cheapflights users on 6/6. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/46:00 am
STL
- SJU
1 stop9h 38m
Delta
Deal found 6/6![Delta logo]()
$173
This Kiwi.com deal was found by Cheapflights users on 6/4. 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 7/314:57 pm
STL
- SJU
2 stops44h 03m
Frontier
Deal found 6/4![Frontier logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 6/4. 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.
Thu 7/306:34 pm
STL
- SJU
2 stops42h 26m
Frontier
Deal found 6/4![Frontier logo]()
$179
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 6/4. 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.
Tue 8/46:34 pm
STL
- SJU
2 stops29h 07m
Frontier
Deal found 6/4![Frontier logo]()
$181
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 9/25:33 pm
STL
- SJU
2 stops29h 50m
Frontier
Deal found 6/7![Frontier logo]()
$182
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 8, 2026.
Round-trip from | $316 (United Airlines) |
|---|---|
One-way from | $158 (Delta) |
Popular in | December |
Cheapest in | September |
Average price | $444 |
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 8, 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
Tue 9/8
11:15 am-8:38 pm
1 stop8h 23m
San Juan Luis Munoz Marin Intl
Fri 9/11
2:55 pm-11:38 pm
1 stop9h 43m
$316
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
5:41 pm-11:36 pm
1 stop6h 55m
$316
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Tue 9/8
9:35 am-7:00 pm
1 stop8h 25m
San Juan Luis Munoz Marin Intl
Fri 9/11
10:00 am-6:25 pm
2 stops9h 25m
$336
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Sun 8/16
6:00 am-1:42 pm
1 stop6h 42m
San Juan Luis Munoz Marin Intl
Tue 8/18
7:00 am-2:33 pm
1 stop8h 33m
$336
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Thu 9/10
2:25 pm-11:50 pm
1 stop8h 25m
San Juan Luis Munoz Marin Intl
Mon 9/14
5:00 am-10:40 am
1 stop6h 40m
$346
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Thu 9/10
8:00 am-8:38 pm
2 stops11h 38m
San Juan Luis Munoz Marin Intl
Sat 9/12
1:00 am-10:12 am
2 stops10h 12m
$369
Quickest round-trip
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Sat 12/5
5:45 am-3:00 pm
1 stop7h 15m
San Juan Luis Munoz Marin Intl
Sat 12/12
10:55 am-1:55 pm
Nonstop5h 00m
$419
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Sun 8/16
12:30 pm-11:25 pm
2 stops9h 55m
San Juan Luis Munoz Marin Intl
Tue 8/18
5:15 am-12:10 pm
2 stops7h 55m
$426
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Wed 7/1
8:25 pm-9:00 am
1 stop11h 35m
San Juan Luis Munoz Marin Intl
Sat 7/4
6:00 am-9:35 am
Nonstop4h 35m
$524
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Mon 8/3
9:55 am-12:20 am
2 stops13h 25m
San Juan Luis Munoz Marin Intl
Sat 8/8
5:05 am-12:35 pm
2 stops8h 30m
$535
Showing 1-10 of 22 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.
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 52 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 8, 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.
Crew
8.6
Entertainment
7.5
Boarding
8.1
Overall
7.9
Food
7.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Entertainment
7.5
Boarding
8.1
Overall
7.9
Food
7.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Entertainment
7.5
Boarding
8.1
Overall
7.9
Food
7.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Entertainment
7.5
Boarding
8.1
Overall
7.9
Food
7.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Entertainment
7.5
Boarding
8.1
Overall
7.9
Food
7.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Entertainment
7.5
Boarding
8.1
Overall
7.9
Food
7.0
Comfort
8.0
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.
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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 8, 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 8, 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 8, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$138 | Average$327 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$205 | Average$380 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$220 | Average$504 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$225 | Average$391 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$250 | Average$507 | FlexibilityNo cancel fee | On-time71% |