$88+ Cheap flights from St. Louis (STL) to Puerto Rico
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 5/16. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SJU
May 28 — Jun 41
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to Puerto Rico 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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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from St. Louis to Puerto Rico
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Cheapest flights from St. Louis to Puerto RicoExplore the most affordable flight options available from St. Louis to Puerto Rico. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 28, 2026.
Explore the most affordable flight options available from St. Louis to Puerto Rico. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 28, 2026.
This Trip.com deal was found by Cheapflights users on 4/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/24:59 pm
STL
- SJU
1 stop8h 02m
Frontier
Sat 5/93:33 pm
SJU
- STL
1 stop9h 48m
Frontier
Deal found 4/23![Frontier logo]()
$233
This Priceline deal was found by Cheapflights users on 4/26. 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 5/114:19 pm
STL
- SJU
1 stop8h 49m
Frontier
Thu 5/143:03 am
SJU
- STL
1 stop22h 18m
Frontier
Deal found 4/26![Frontier logo]()
$236
This Frontier deal was found by Cheapflights users on 4/27. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/14:19 pm
STL
- SJU
1 stop8h 52m
Frontier
Thu 6/46:09 pm
SJU
- STL
1 stop6h 48m
Frontier
Deal found 4/27![Frontier logo]()
$243
This Priceline deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/24:59 pm
STL
- SJU
1 stop8h 02m
Frontier
Fri 5/83:33 pm
SJU
- STL
1 stop9h 48m
Frontier
Deal found 4/24![Frontier logo]()
$256
This Frontier deal was found by Cheapflights users on 4/27. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/14:09 pm
STL
- SJU
1 stop9h 02m
Frontier
Thu 8/66:32 am
SJU
- STL
1 stop9h 17m
Frontier
Deal found 4/27![Frontier logo]()
$258
This Priceline deal was found by Cheapflights users on 4/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/244:59 pm
STL
- SJU
1 stop8h 02m
Frontier
Thu 4/303:21 am
SJU
- STL
1 stop20h 58m
Frontier
Deal found 4/23![Frontier logo]()
$261
This Frontier deal was found by Cheapflights users on 4/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/124:17 pm
STL
- SJU
1 stop8h 52m
Frontier
Fri 6/194:05 pm
SJU
- STL
1 stop9h 04m
Frontier
Deal found 4/28![Frontier logo]()
$276
This Frontier deal was found by Cheapflights users on 4/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/204:17 pm
STL
- SJU
1 stop8h 52m
Frontier
Sat 6/276:00 am
SJU
- STL
1 stop19h 09m
Frontier
Deal found 4/25![Frontier logo]()
$277
This Kiwi.com deal was found by Cheapflights users on 4/27. 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 5/196:33 pm
STL
- SJU
2 stops21h 53m
Frontier
Fri 5/295:15 pm
SJU
- STL
1 stop16h 40m
Frontier
Deal found 4/27![Frontier logo]()
$282
This United Airlines deal was found by Cheapflights users on 4/25. 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.
Fri 7/319:23 am
STL
- CPX
2 stops30h 58m
United Airlines
Wed 8/510:48 am
CPX
- STL
2 stops24h 19m
United Airlines
Deal found 4/25![United Airlines logo]()
$991
This United Airlines deal was found by Cheapflights users on 4/25. 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 8/29:23 am
STL
- CPX
2 stops30h 58m
United Airlines
Wed 8/510:48 am
CPX
- STL
2 stops24h 19m
United Airlines
Deal found 4/25![United Airlines logo]()
$1,006
This United Airlines deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/299:23 am
STL
- CPX
2 stops30h 58m
United Airlines
Wed 8/510:48 am
CPX
- STL
2 stops24h 19m
United Airlines
Deal found 4/25![United Airlines logo]()
$1,016
Best flights from St. Louis to Puerto RicoDiscover carefully curated flight deals from St. Louis to Puerto Rico that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 28, 2026.
Discover carefully curated flight deals from St. Louis to Puerto Rico that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 28, 2026.
This Southwest deal was found by Cheapflights users on 4/27. 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 9/55:05 am
STL
- SJU
1 stop7h 55m
Southwest
Sat 9/1910:25 am
SJU
- STL
1 stop10h 20m
Southwest
Deal found 4/27![Southwest logo]()
$336
This Delta deal was found by Cheapflights users on 4/25. 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 8/18:00 am
STL
- SJU
1 stop7h 45m
Delta
Thu 8/65:56 pm
SJU
- STL
1 stop6h 57m
Delta
Deal found 4/25![Delta logo]()
$336
This United Airlines deal was found by Cheapflights users on 4/27. 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 5/286:00 am
STL
- SJU
2 stops14h 24m
United Airlines
Tue 6/21:00 am
SJU
- STL
2 stops12h 11m
United Airlines
Deal found 4/27![United Airlines logo]()
$520
This Southwest deal was found by Cheapflights users on 4/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/17:15 am
STL
- SJU
2 stops9h 55m
Southwest
Sun 9/65:30 am
SJU
- STL
2 stops11h 20m
Southwest
Deal found 4/23![Southwest logo]()
$427
This Delta deal was found by Cheapflights users on 4/27. 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 9/206:00 am
STL
- SJU
1 stop9h 31m
Delta
Sat 9/265:41 pm
SJU
- STL
1 stop6h 56m
Delta
Deal found 4/27![Delta logo]()
$436
This Southwest deal was found by Cheapflights users on 4/26. 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 7/172:50 pm
STL
- SJU
1 stop8h 15m
Southwest
Sat 8/155:05 am
SJU
- STL
2 stops8h 30m
Southwest
Deal found 4/26![Southwest logo]()
$467
This United Airlines deal was found by Cheapflights users on 4/27. 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 5/286:00 am
STL
- SJU
2 stops14h 24m
United Airlines
Wed 6/31:00 am
SJU
- STL
2 stops12h 11m
United Airlines
Deal found 4/27![United Airlines logo]()
$520
This United Airlines deal was found by Cheapflights users on 4/27. 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 6/279:23 am
STL
- SJU
1 stop10h 11m
United Airlines
Tue 6/301:00 am
SJU
- STL
2 stops12h 11m
United Airlines
Deal found 4/27![United Airlines logo]()
$557
This Southwest deal was found by Cheapflights users on 4/27. 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 5/292:10 pm
STL
- SJU
2 stops8h 45m
Southwest
Mon 6/15:35 am
SJU
- STL
2 stops10h 55m
Southwest
Deal found 4/27![Southwest logo]()
$621
This United Airlines deal was found by Cheapflights users on 4/27. 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.
Fri 6/195:41 pm
STL
- SJU
1 stop25h 53m
United Airlines
Tue 6/231:00 am
SJU
- STL
2 stops12h 11m
United Airlines
Deal found 4/27![United Airlines logo]()
$622
This United Airlines deal was found by Cheapflights users on 4/27. 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 5/234:48 pm
STL
- CPX
2 stops22h 25m
United Airlines
Fri 5/2910:48 am
CPX
- STL
2 stops12h 57m
United Airlines
Deal found 4/27![United Airlines logo]()
$1,708
This United Airlines deal was found by Cheapflights users on 4/25. 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 5/175:28 pm
STL
- CPX
2 stops45h 45m
United Airlines
Thu 5/2110:30 am
CPX
- STL
2 stops13h 15m
United Airlines
Deal found 4/25![United Airlines logo]()
$2,041
This United Airlines deal was found by Cheapflights users on 4/27. 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 5/2112:55 pm
STL
- CPX
2 stops26h 18m
United Airlines
Tue 5/2610:30 am
CPX
- STL
2 stops35h 40m
United Airlines
Deal found 4/27![United Airlines logo]()
$2,043
This United Airlines deal was found by Cheapflights users on 4/27. 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 5/2112:55 pm
STL
- CPX
2 stops26h 18m
United Airlines
Sun 5/2410:30 am
CPX
- STL
2 stops13h 15m
United Airlines
Deal found 4/27![United Airlines logo]()
$2,049
Last-minute flights from St. Louis to Puerto RicoDiscover last-minute flight deals from St. Louis to Puerto Rico. Data last updated April 28, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Puerto Rico. Data last updated April 28, 2026 and is based on user searches.
This Priceline deal was found by Cheapflights users on 4/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/274:59 pm
STL
- SJU
1 stop15h 55m
Frontier
Sun 5/33:21 am
SJU
- STL
1 stop20h 58m
Frontier
Deal found 4/23![Frontier logo]()
$261
This Trip.com deal was found by Cheapflights users on 4/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/24:59 pm
STL
- SJU
1 stop8h 02m
Frontier
Sat 5/93:33 pm
SJU
- STL
1 stop9h 48m
Frontier
Deal found 4/23![Frontier logo]()
$233
This Priceline deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/24:59 pm
STL
- SJU
1 stop8h 02m
Frontier
Fri 5/83:33 pm
SJU
- STL
1 stop9h 48m
Frontier
Deal found 4/24![Frontier logo]()
$256
This Priceline deal was found by Cheapflights users on 4/26. 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 5/114:19 pm
STL
- SJU
1 stop8h 49m
Frontier
Thu 5/143:03 am
SJU
- STL
1 stop22h 18m
Frontier
Deal found 4/26![Frontier logo]()
$236
This Kiwi.com deal was found by Cheapflights users on 4/27. 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 5/196:33 pm
STL
- SJU
2 stops21h 53m
Frontier
Fri 5/295:15 pm
SJU
- STL
1 stop16h 40m
Frontier
Deal found 4/27![Frontier logo]()
$282
This Kiwi.com deal was found by Cheapflights users on 4/27. 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 5/205:27 pm
STL
- SJU
2 stops21h 28m
Frontier
Fri 5/295:15 pm
SJU
- STL
1 stop16h 40m
Frontier
Deal found 4/27![Frontier logo]()
$288
This Frontier deal was found by Cheapflights users on 4/27. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/224:19 pm
STL
- SJU
1 stop8h 49m
Frontier
Sat 5/236:25 am
SJU
- STL
1 stop14h 06m
Frontier
Deal found 4/27![Frontier logo]()
$293
This United Airlines deal was found by Cheapflights users on 4/27. 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 5/234:48 pm
STL
- CPX
2 stops22h 25m
United Airlines
Mon 5/2510:30 am
CPX
- STL
2 stops35h 40m
United Airlines
Deal found 4/27![United Airlines logo]()
$1,598
This United Airlines deal was found by Cheapflights users on 4/27. 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 5/234:48 pm
STL
- CPX
2 stops22h 25m
United Airlines
Tue 5/2610:30 am
CPX
- STL
2 stops35h 40m
United Airlines
Deal found 4/27![United Airlines logo]()
$1,703
This United Airlines deal was found by Cheapflights users on 4/27. 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 5/234:48 pm
STL
- CPX
2 stops22h 25m
United Airlines
Fri 5/2910:48 am
CPX
- STL
2 stops12h 57m
United Airlines
Deal found 4/27![United Airlines logo]()
$1,708
This Frontier deal was found by Cheapflights users on 4/27. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/263:33 pm
STL
- SJU
1 stop12h 16m
Frontier
Thu 6/46:09 pm
SJU
- STL
1 stop6h 48m
Frontier
Deal found 4/27![Frontier logo]()
$294
This Kiwi.com deal was found by Cheapflights users on 4/26. 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 5/286:33 pm
STL
- SJU
2 stops20h 17m
Frontier
Fri 6/55:15 pm
SJU
- STL
1 stop16h 40m
Frontier
Deal found 4/26![Frontier logo]()
$283
One-way flights from St. Louis to Puerto RicoSearch for one-way flight options from St. Louis to Puerto Rico. Find affordable one-way fares based on user searches. Data last updated April 28, 2026.
Search for one-way flight options from St. Louis to Puerto Rico. Find affordable one-way fares based on user searches. Data last updated April 28, 2026.
This Priceline deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/164:19 pm
STL
- SJU
1 stop14h 45m
Frontier
Deal found 4/24![Frontier logo]()
$88
This Super.com deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/154:19 pm
STL
- SJU
1 stop14h 45m
Frontier
Deal found 4/25![Frontier logo]()
$97
This Expedia deal was found by Cheapflights users on 4/26. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/244:17 pm
STL
- SJU
1 stop14h 38m
Frontier
Deal found 4/26![Frontier logo]()
$118
This Frontier deal was found by Cheapflights users on 4/27. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/254:09 pm
STL
- SJU
1 stop9h 02m
Frontier
Deal found 4/27![Frontier logo]()
$120
This Frontier deal was found by Cheapflights users on 4/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/234:19 pm
STL
- SJU
1 stop8h 49m
Frontier
Deal found 4/23![Frontier logo]()
$123
This Delta deal was found by Cheapflights users on 4/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/256:00 am
STL
- SJU
1 stop9h 35m
Delta
Deal found 4/23![Delta logo]()
$129
This Frontier deal was found by Cheapflights users on 4/27. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/64:19 pm
STL
- SJU
1 stop8h 49m
Frontier
Deal found 4/27![Frontier logo]()
$132
This Kiwi.com deal was found by Cheapflights users on 4/25. 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 6/105:13 pm
STL
- SJU
2 stops54h 02m
Frontier
Deal found 4/25![Frontier logo]()
$133
This Super.com deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/234:17 pm
STL
- SJU
1 stop8h 52m
Frontier
Deal found 4/24![Frontier logo]()
$137
This Frontier deal was found by Cheapflights users on 4/27. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/227:03 pm
STL
- SJU
1 stop8h 52m
Frontier
Deal found 4/27![Frontier logo]()
$138
This Kiwi.com deal was found by Cheapflights users on 4/25. 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 5/255:27 pm
STL
- SJU
2 stops29h 32m
Frontier
Deal found 4/25![Frontier logo]()
$140
Find flight deals from St. Louis to Puerto Rico
Keep the following information in mind while searching for St. Louis to Puerto Rico flight deals. Data was last updated April 28, 2026.
Round-trip from | $236 (Priceline) |
|---|---|
One-way from | $88 (Priceline) |
Popular in | December |
Cheapest in | September |
Average price | $339 |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Puerto Rico 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 April 28, 2026.
Use the filters below to find and compare flights from St. Louis to Puerto Rico 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
5:05 am-2:00 pm
1 stop7h 55m
San Juan Luis Munoz Marin Intl
Sat 9/19
10:25 am-7:45 pm
1 stop10h 20m
$336
Quickest round-trip
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Sat 8/1
8:00 am-4:45 pm
1 stop7h 45m
San Juan Luis Munoz Marin Intl
Thu 8/6
5:56 pm-11:53 pm
1 stop6h 57m
$336
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Tue 9/1
7:15 am-6:10 pm
2 stops9h 55m
San Juan Luis Munoz Marin Intl
Sun 9/6
5:30 am-3:50 pm
2 stops11h 20m
$427
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Sun 9/20
6:00 am-4:31 pm
1 stop9h 31m
San Juan Luis Munoz Marin Intl
Sat 9/26
5:41 pm-11:37 pm
1 stop6h 56m
$436
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Fri 7/17
2:50 pm-12:05 am
1 stop8h 15m
San Juan Luis Munoz Marin Intl
Sat 8/15
5:05 am-12:35 pm
2 stops8h 30m
$467
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Thu 5/28
6:00 am-9:24 pm
2 stops14h 24m
San Juan Luis Munoz Marin Intl
Tue 6/2
1:00 am-12:11 pm
2 stops12h 11m
$520
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Thu 5/28
6:00 am-9:24 pm
2 stops14h 24m
San Juan Luis Munoz Marin Intl
Wed 6/3
1:00 am-12:11 pm
2 stops12h 11m
$520
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Sat 6/27
9:23 am-8:34 pm
1 stop10h 11m
San Juan Luis Munoz Marin Intl
Tue 6/30
1:00 am-12:11 pm
2 stops12h 11m
$557
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Fri 5/29
2:10 pm-11:55 pm
2 stops8h 45m
San Juan Luis Munoz Marin Intl
Mon 6/1
5:35 am-3:30 pm
2 stops10h 55m
$621
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Fri 6/19
5:41 pm-8:34 pm
1 stop25h 53m
San Juan Luis Munoz Marin Intl
Tue 6/23
1:00 am-12:11 pm
2 stops12h 11m
$622
Showing 1-10 of 25 resultsSorted by cheapest first
Best time to book a flight from St. Louis to Puerto Rico
Have a flexible travel schedule? Discover the best time to fly to Puerto Rico from St. Louis with our price prediction graph.
STL-SJU
STL-CPX
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 Puerto Rico
STL-PR0
STL-SJU
STL-CPX
How far ahead should I book a flight from St. Louis to Puerto Rico?
The price you pay for your flight from St. Louis to Puerto Rico 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.
What is the cheapest month to book a flight from St. Louis to Puerto Rico?
Currently, July is the cheapest month in which you can book a flight from St. Louis to Puerto Rico (average of $101). Flying from St. Louis to Puerto Rico in April is currently the most expensive (average of $193). 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 often are flights from St. Louis to Puerto Rico delayed?
About 31% of weekly flights between St. Louis and Puerto Rico have experienced delays in the past year, with the average delay time being 91 minutes.
What is the most punctual flight time for St. Louis to Puerto Rico 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 Puerto Rico flights?
Over the last year, Southwest have had the lowest number of delays on this route, with just 30% of flights being delayed.
Reviews of airlines servicing Puerto Rico
Get insights into the airlines that provide service to Puerto Rico. 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 Puerto Rico. Reviews last updated April 28, 2026.
Get a feel of what it's like to fly with Southwest,Delta, andUnited Airlines from St. Louis to Puerto Rico by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.5
Overall
8.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Entertainment
7.5
Overall
8.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Entertainment
7.5
Overall
8.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Entertainment
7.5
Overall
8.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Entertainment
7.5
Overall
8.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Entertainment
7.5
Overall
8.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Puerto Rico. 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 Puerto Rico
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Complete your trip
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Find flights from St. Louis to Puerto Rico, based on your preferred cabin class, be it economy, premium economy, business, or first class.
St. Louis and Puerto Rico flights
Browse other St. Louis and Puerto Rico flight options. Last updated on April 28, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 6 airlines flying from St. Louis to Puerto Rico
Discover the top 6 airlines that operate flights from St. Louis to Puerto Rico. 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 April 28, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$138 | Average$330 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$170 | Average$334 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$197 | Average$383 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$219 | Average$512 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$225 | Average$360 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$226 | Average$522 | FlexibilityNo cancel fee | On-time71% |