$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 15 — Jul 221
Round-trip
1 adult, Economy
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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 15, 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 15, 2026.
This Southwest deal was found by Cheapflights users on 6/13. 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 8/155:05 am
STL
- SJU
1 stop10h 35m
Southwest
Fri 8/215:30 am
SJU
- STL
2 stops10h 40m
Southwest
Deal found 6/13![Southwest logo]()
$326
This Southwest deal was found by Cheapflights users on 6/14. 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
Thu 9/105:00 am
SJU
- STL
1 stop10h 55m
Southwest
Deal found 6/14![Southwest logo]()
$331
This Delta 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 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 6/10![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 9/26:54 am
STL
- SJU
1 stop16h 05m
American Airlines
Wed 9/92:58 pm
SJU
- STL
2 stops10h 29m
American Airlines
Deal found 6/10![American Airlines logo]()
$341
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
Sat 9/121:00 am
SJU
- STL
2 stops10h 12m
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 United Airlines deal was found by Cheapflights users on 6/13. 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 9/57:25 am
STL
- SJU
2 stops12h 13m
United Airlines
Thu 9/101:00 am
SJU
- STL
2 stops12h 02m
United Airlines
Deal found 6/13![United Airlines logo]()
$364
This Southwest deal was found by Cheapflights users on 6/13. 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
Mon 8/175:30 am
SJU
- STL
2 stops10h 40m
Southwest
Deal found 6/13![Southwest logo]()
$366
This Delta deal was found by Cheapflights users on 6/14. 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 9/177:05 am
STL
- SJU
1 stop8h 26m
Delta
Mon 9/215:41 pm
SJU
- STL
1 stop6h 55m
Delta
Deal found 6/14![Delta logo]()
$367
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.
Tue 10/131:45 pm
STL
- SJU
2 stops9h 00m
Southwest
Tue 10/206:10 am
SJU
- STL
2 stops10h 40m
Southwest
Deal found 6/12![Southwest logo]()
$376
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 15, 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 15, 2026.
This Southwest deal was found by Cheapflights users on 6/13. 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 9/511:15 am
STL
- SJU
1 stop9h 40m
Southwest
Fri 9/1110:00 am
SJU
- STL
2 stops9h 25m
Southwest
Deal found 6/13![Southwest logo]()
$331
This Delta deal was found by Cheapflights users on 6/14. 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 9/212:52 pm
STL
- SJU
1 stop8h 37m
Delta
Wed 9/95:59 pm
SJU
- STL
1 stop6h 43m
Delta
Deal found 6/14![Delta logo]()
$336
This United Airlines deal was found by Cheapflights users on 6/14. 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 9/111:15 am
STL
- SJU
1 stop8h 23m
United Airlines
Tue 9/11:00 am
SJU
- STL
2 stops12h 02m
United Airlines
Deal found 6/14![United Airlines logo]()
$421
This Priceline deal was found by Cheapflights users on 6/14. 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.
Mon 7/134:09 pm
STL
- SJU
1 stop18h 07m
Frontier
Mon 7/2010:48 pm
SJU
- STL
1 stop26h 11m
Frontier
Deal found 6/14![Frontier logo]()
$448
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 6/12. 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 United Airlines deal was found by Cheapflights users on 6/14. 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 stops14h 50m
United Airlines
Sun 9/202:55 pm
SJU
- STL
1 stop9h 43m
United Airlines
Deal found 6/14![United Airlines logo]()
$426
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.
Sun 8/24:20 pm
STL
- SJU
1 stop7h 10m
Southwest
Fri 8/78:55 pm
SJU
- STL
1 stop11h 45m
Southwest
Deal found 6/11![Southwest logo]()
$401
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.
Mon 8/39:55 am
STL
- SJU
2 stops13h 25m
Southwest
Fri 8/78:55 pm
SJU
- STL
1 stop11h 45m
Southwest
Deal found 6/12![Southwest logo]()
$446
Last-minute flights from St. Louis to San JuanDiscover last-minute flight deals from St. Louis to San Juan. Data last updated June 15, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to San Juan. Data last updated June 15, 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 Priceline deal was found by Cheapflights users on 6/14. 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.
Mon 7/64:09 pm
STL
- SJU
1 stop9h 06m
Frontier
Thu 7/99:02 am
SJU
- STL
1 stop15h 57m
Frontier
Deal found 6/14![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 American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/197:32 am
STL
- SJU
1 stop14h 27m
American Airlines
Sat 7/255:45 am
SJU
- STL
1 stop15h 08m
American Airlines
Deal found 6/12![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 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.
Mon 7/2711:00 am
STL
- SJU
1 stop12h 20m
Southwest
Fri 7/3110:20 pm
SJU
- STL
1 stop12h 05m
Southwest
Deal found 6/11![Southwest logo]()
$401
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 15, 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 15, 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 Southwest deal was found by Cheapflights users on 6/14. 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 8/1010:10 am
STL
- SJU
1 stop8h 55m
Southwest
Deal found 6/14![Southwest 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.
Sat 8/84:57 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 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.
Tue 8/255:42 am
STL
- SJU
2 stops11h 52m
American Airlines
Deal found 6/10![American Airlines 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.
Sun 8/96:34 pm
STL
- SJU
2 stops42h 07m
Frontier
Deal found 6/10![Frontier logo]()
$170
This Kiwi.com deal was found by Cheapflights users on 6/14. 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 9/86:33 pm
STL
- SJU
2 stops22h 04m
Frontier
Deal found 6/14![Frontier logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 6/13. 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 8/116:34 pm
STL
- SJU
2 stops36h 23m
Frontier
Deal found 6/13![Frontier logo]()
$178
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.
Sat 9/55:33 pm
STL
- SJU
2 stops43h 56m
Frontier
Deal found 6/11![Frontier logo]()
$189
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 15, 2026.
Round-trip from | $326 (Southwest) |
|---|---|
One-way from | $160 (Kiwi.com) |
Popular in | December |
Cheapest in | September |
Average price | $474 |
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 15, 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
Sat 9/5
11:15 am-9:55 pm
1 stop9h 40m
San Juan Luis Munoz Marin Intl
Fri 9/11
10:00 am-6:25 pm
2 stops9h 25m
$331
Quickest round-trip
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Wed 9/2
12:52 pm-10:29 pm
1 stop8h 37m
San Juan Luis Munoz Marin Intl
Wed 9/9
5:59 pm-11:42 pm
1 stop6h 43m
$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
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
Sun 8/2
4:20 pm-12:30 am
1 stop7h 10m
San Juan Luis Munoz Marin Intl
Fri 8/7
8:55 pm-7:40 am
1 stop11h 45m
$401
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Tue 9/1
11:15 am-8:38 pm
1 stop8h 23m
San Juan Luis Munoz Marin Intl
Tue 9/1
1:00 am-12:02 pm
2 stops12h 02m
$421
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Sat 9/12
8:00 am-11:50 pm
2 stops14h 50m
San Juan Luis Munoz Marin Intl
Sun 9/20
2:55 pm-11:38 pm
1 stop9h 43m
$426
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
Fri 8/7
8:55 pm-7:40 am
1 stop11h 45m
$446
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Mon 7/13
4:09 pm-11:16 am
1 stop18h 07m
San Juan Luis Munoz Marin Intl
Mon 7/20
10:48 pm-11:59 pm
1 stop26h 11m
$448
Cheapest one-way
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Mon 8/10
10:10 am-8:05 pm
1 stop8h 55m
$163
Showing 1-10 of 19 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 15, 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 15, 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
Comfort
8.0
Overall
7.9
Food
7.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Comfort
8.0
Overall
7.9
Food
7.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Comfort
8.0
Overall
7.9
Food
7.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Comfort
8.0
Overall
7.9
Food
7.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Comfort
8.0
Overall
7.9
Food
7.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Comfort
8.0
Overall
7.9
Food
7.0
Boarding
8.1
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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St. Louis and San Juan flights
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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 15, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$138 | Average$325 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$205 | Average$384 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$225 | Average$406 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$246 | Average$486 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$250 | Average$503 | FlexibilityNo cancel fee | On-time71% |