$101+ 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 4/18. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SJU
abr. 10 — abr. 171
Round-trip
1 adult, Economy
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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 marzo 11, 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 marzo 11, 2026.
This Priceline deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 5/54:55 pm
STL
- SJU
1 stop8h 06m
Frontier
vie. 5/83:08 am
SJU
- STL
1 stop21h 11m
Frontier
Deal found 3/8![Frontier logo]()
$202
This CheapOair deal was found by Cheapflights users on 3/6. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 4/84:59 pm
STL
- SJU
1 stop6h 03m
Frontier
lun. 4/133:08 am
SJU
- STL
1 stop21h 11m
Frontier
Deal found 3/6![Frontier logo]()
$221
This American Airlines deal was found by Cheapflights users on 3/6. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 4/266:29 am
STL
- SJU
1 stop7h 00m
American Airlines
jue. 4/306:45 am
SJU
- STL
1 stop11h 36m
American Airlines
Deal found 3/6![American Airlines logo]()
$222
This Frontier deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 5/44:59 pm
STL
- SJU
1 stop8h 02m
Frontier
jue. 5/711:07 am
SJU
- STL
1 stop13h 12m
Frontier
Deal found 3/8![Frontier logo]()
$223
This American Airlines deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 4/226:29 am
STL
- SJU
1 stop14h 36m
American Airlines
jue. 4/3011:59 pm
SJU
- STL
1 stop9h 55m
American Airlines
Deal found 3/9![American Airlines logo]()
$227
This CheapOair deal was found by Cheapflights users on 3/6. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 3/3111:27 am
STL
- SJU
1 stop12h 30m
Frontier
mar. 4/76:30 am
SJU
- STL
1 stop17h 55m
Frontier
Deal found 3/6![Frontier logo]()
$234
This Frontier deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 3/314:51 pm
STL
- SJU
1 stop8h 12m
Frontier
lun. 4/612:28 pm
SJU
- STL
1 stop11h 57m
Frontier
Deal found 3/9![Frontier logo]()
$239
This CheapOair deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 5/94:55 pm
STL
- SJU
1 stop8h 06m
Frontier
mar. 5/123:08 am
SJU
- STL
1 stop21h 11m
Frontier
Deal found 3/9![Frontier logo]()
$241
This CheapOair deal was found by Cheapflights users on 3/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 4/154:59 pm
STL
- SJU
1 stop8h 02m
Frontier
mié. 4/226:30 am
SJU
- STL
1 stop17h 49m
Frontier
Deal found 3/10![Frontier logo]()
$242
This CheapOair deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 4/84:59 pm
STL
- SJU
1 stop8h 02m
Frontier
vie. 4/103:16 am
SJU
- STL
1 stop21h 09m
Frontier
Deal found 3/9![Frontier logo]()
$243
This Frontier deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 5/84:55 pm
STL
- SJU
1 stop8h 06m
Frontier
mié. 5/1311:07 am
SJU
- STL
1 stop13h 12m
Frontier
Deal found 3/9![Frontier logo]()
$244
This CheapOair deal was found by Cheapflights users on 3/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 5/34:59 pm
STL
- SJU
1 stop15h 55m
Frontier
dom. 5/106:30 am
SJU
- STL
1 stop17h 49m
Frontier
Deal found 3/10![Frontier logo]()
$254
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 marzo 11, 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 marzo 11, 2026.
This United Airlines deal was found by Cheapflights users on 3/6. 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.
lun. 5/46:00 am
STL
- SJU
1 stop8h 42m
United Airlines
vie. 5/87:40 am
SJU
- STL
1 stop9h 59m
United Airlines
Deal found 3/6![United Airlines logo]()
$222
This Southwest deal was found by Cheapflights users on 3/6. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 6/279:30 am
STL
- SJU
1 stop8h 30m
Southwest
lun. 7/66:00 am
SJU
- STL
1 stop7h 45m
Southwest
Deal found 3/6![Southwest logo]()
$436
This United Airlines deal was found by Cheapflights users on 3/7. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 5/39:21 am
STL
- SJU
1 stop10h 13m
United Airlines
mié. 5/67:20 am
SJU
- STL
2 stops14h 53m
United Airlines
Deal found 3/7![United Airlines logo]()
$312
This United Airlines deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 5/46:30 am
STL
- SJU
2 stops13h 54m
United Airlines
jue. 5/77:20 am
SJU
- STL
2 stops14h 53m
United Airlines
Deal found 3/9![United Airlines logo]()
$382
This Southwest deal was found by Cheapflights users on 3/7. 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.
dom. 8/28:55 pm
STL
- SJU
1 stop12h 50m
Southwest
dom. 8/165:30 am
SJU
- STL
2 stops11h 20m
Southwest
Deal found 3/7![Southwest logo]()
$436
This Southwest deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 5/152:25 pm
STL
- SJU
1 stop8h 00m
Southwest
lun. 5/185:35 am
SJU
- STL
2 stops10h 55m
Southwest
Deal found 3/9![Southwest logo]()
$448
This United Airlines deal was found by Cheapflights users on 3/7. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 5/37:45 am
STL
- SJU
2 stops12h 39m
United Airlines
jue. 5/77:20 am
SJU
- STL
2 stops14h 53m
United Airlines
Deal found 3/7![United Airlines logo]()
$418
This Southwest deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 5/12:10 pm
STL
- SJU
2 stops8h 30m
Southwest
sáb. 5/99:40 am
SJU
- STL
2 stops9h 25m
Southwest
Deal found 3/9![Southwest logo]()
$495
This Southwest deal was found by Cheapflights users on 3/6. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 6/59:55 am
STL
- SJU
2 stops13h 20m
Southwest
sáb. 6/139:25 pm
SJU
- STL
1 stop12h 00m
Southwest
Deal found 3/6![Southwest logo]()
$521
Last-minute flights from St. Louis to Puerto RicoDiscover last-minute flight deals from St. Louis to Puerto Rico. Data last updated marzo 11, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Puerto Rico. Data last updated marzo 11, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 3/6. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 3/3111:27 am
STL
- SJU
1 stop12h 30m
Frontier
mar. 4/76:30 am
SJU
- STL
1 stop17h 55m
Frontier
Deal found 3/6![Frontier logo]()
$234
This Frontier deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 3/314:51 pm
STL
- SJU
1 stop8h 12m
Frontier
lun. 4/612:28 pm
SJU
- STL
1 stop11h 57m
Frontier
Deal found 3/9![Frontier logo]()
$239
This Priceline deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 4/14:54 pm
STL
- SJU
1 stop14h 02m
Frontier
lun. 4/612:28 pm
SJU
- STL
1 stop11h 57m
Frontier
Deal found 3/9![Frontier logo]()
$260
This Priceline deal was found by Cheapflights users on 3/7. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 4/74:59 pm
STL
- SJU
1 stop15h 19m
Frontier
lun. 4/133:08 am
SJU
- STL
1 stop21h 11m
Frontier
Deal found 3/7![Frontier logo]()
$202
This CheapOair deal was found by Cheapflights users on 3/6. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 4/84:59 pm
STL
- SJU
1 stop6h 03m
Frontier
lun. 4/133:08 am
SJU
- STL
1 stop21h 11m
Frontier
Deal found 3/6![Frontier logo]()
$221
This CheapOair deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 4/84:59 pm
STL
- SJU
1 stop8h 02m
Frontier
sáb. 4/113:21 am
SJU
- STL
1 stop29h 30m
Frontier
Deal found 3/8![Frontier logo]()
$243
This CheapOair deal was found by Cheapflights users on 3/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 4/154:59 pm
STL
- SJU
1 stop8h 02m
Frontier
mié. 4/226:30 am
SJU
- STL
1 stop17h 49m
Frontier
Deal found 3/10![Frontier logo]()
$242
This American Airlines deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 4/226:29 am
STL
- SJU
1 stop14h 36m
American Airlines
jue. 4/3011:59 pm
SJU
- STL
1 stop9h 55m
American Airlines
Deal found 3/9![American Airlines logo]()
$227
This American Airlines deal was found by Cheapflights users on 3/6. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 4/266:29 am
STL
- SJU
1 stop7h 00m
American Airlines
jue. 4/306:45 am
SJU
- STL
1 stop11h 36m
American Airlines
Deal found 3/6![American Airlines logo]()
$222
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 marzo 11, 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 marzo 11, 2026.
This Frontier deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 4/184:59 pm
STL
- SJU
1 stop8h 02m
Frontier
Deal found 3/9![Frontier logo]()
$101
This Priceline deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 4/94:59 pm
STL
- SJU
1 stop26h 01m
Frontier
Deal found 3/9![Frontier logo]()
$107
This Delta deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 4/1411:42 am
STL
- SJU
1 stop7h 42m
Delta
Deal found 3/9![Delta logo]()
$111
This American Airlines deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 4/226:29 am
STL
- SJU
1 stop14h 36m
American Airlines
Deal found 3/9![American Airlines logo]()
$116
This Priceline deal was found by Cheapflights users on 3/10. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 5/274:44 pm
STL
- SJU
1 stop29h 38m
Frontier
Deal found 3/10![Frontier logo]()
$117
This Priceline deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 3/304:51 pm
STL
- SJU
1 stop8h 07m
Frontier
Deal found 3/8![Frontier logo]()
$120
This Priceline deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 4/234:59 pm
STL
- SJU
1 stop8h 02m
Frontier
Deal found 3/9![Frontier logo]()
$122
This Priceline deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 5/144:55 pm
STL
- SJU
1 stop28h 53m
Frontier
Deal found 3/9![Frontier logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 3/10. 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.
mar. 4/711:21 am
STL
- SJU
2 stops20h 57m
Frontier
Deal found 3/10![Frontier logo]()
$129
This Kiwi.com deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 4/96:29 pm
STL
- SJU
1 stop24h 21m
Multiple Airlines
Deal found 3/9![Multiple Airlines logo]()
$131
This Kiwi.com deal was found by Cheapflights users on 3/7. 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.
mié. 4/158:23 pm
STL
- CPX
3 stops34h 42m
Multiple Airlines
Deal found 3/7![Multiple Airlines logo]()
$317
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 marzo 11, 2026.
Round-trip from | $202 (Priceline) |
|---|---|
One-way from | $101 (Frontier) |
Popular in | December |
Cheapest in | September |
Average price | $406 |
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 marzo 11, 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
lun. 5/4
6:00 am-3:42 pm
1 stop8h 42m
San Juan Luis Munoz Marin Intl
vie. 5/8
7:40 am-4:39 pm
1 stop9h 59m
$222
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
dom. 5/3
9:21 am-8:34 pm
1 stop10h 13m
San Juan Luis Munoz Marin Intl
mié. 5/6
7:20 am-9:13 pm
2 stops14h 53m
$312
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
lun. 5/4
6:30 am-9:24 pm
2 stops13h 54m
San Juan Luis Munoz Marin Intl
jue. 5/7
7:20 am-9:13 pm
2 stops14h 53m
$382
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
dom. 5/3
7:45 am-9:24 pm
2 stops12h 39m
San Juan Luis Munoz Marin Intl
jue. 5/7
7:20 am-9:13 pm
2 stops14h 53m
$418
Quickest round-trip
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
sáb. 6/27
9:30 am-7:00 pm
1 stop8h 30m
San Juan Luis Munoz Marin Intl
lun. 7/6
6:00 am-12:45 pm
1 stop7h 45m
$436
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
dom. 8/2
8:55 pm-10:45 am
1 stop12h 50m
San Juan Luis Munoz Marin Intl
dom. 8/16
5:30 am-3:50 pm
2 stops11h 20m
$436
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
vie. 5/15
2:25 pm-11:25 pm
1 stop8h 00m
San Juan Luis Munoz Marin Intl
lun. 5/18
5:35 am-3:30 pm
2 stops10h 55m
$448
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
vie. 5/1
2:10 pm-11:40 pm
2 stops8h 30m
San Juan Luis Munoz Marin Intl
sáb. 5/9
9:40 am-6:05 pm
2 stops9h 25m
$495
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
vie. 6/5
9:55 am-12:15 am
2 stops13h 20m
San Juan Luis Munoz Marin Intl
sáb. 6/13
9:25 pm-8:25 am
1 stop12h 00m
$521
Cheapest one-way
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
mar. 5/5
9:21 am-9:24 pm
2 stops11h 03m
$111
Showing 1-10 of 21 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
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 $144). Flying from St. Louis to Puerto Rico in April is currently the most expensive (average of $246). 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 PR?
Find hourly flight availability from St. Louis to Puerto Rico. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated marzo 11, 2026.
When flying from St. Louis to Puerto Rico, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
How often are flights from St. Louis to Puerto Rico delayed?
About 21% of weekly flights between St. Louis and Puerto Rico 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 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 20% 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 marzo 11, 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
Boarding
8.1
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Entertainment
7.5
Boarding
8.1
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Entertainment
7.5
Boarding
8.1
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Entertainment
7.5
Boarding
8.1
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Entertainment
7.5
Boarding
8.1
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Entertainment
7.5
Boarding
8.1
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
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
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Puerto Rico by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from St. Louis to Puerto Rico by cabin class
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 marzo 11, 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 marzo 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$138 | Average$322 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$146 | Average$334 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$156 | Average$387 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$219 | Average$525 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$225 | Average$371 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$231 | Average$518 | FlexibilityNo cancel fee | On-time71% |