$87+ Cheap flights from St. Louis (STL) to Luis Munoz Marin Intl (SJU)
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 3/3. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SJU
Mar 13 — Mar 201
1 adult, Economy
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1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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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 Luis Munoz Marin Intl
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Cheapest flights from St. Louis to Luis Munoz Marin IntlExplore the most affordable flight options available from St. Louis to Luis Munoz Marin Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 11, 2026.
Explore the most affordable flight options available from St. Louis to Luis Munoz Marin Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 11, 2026.
This Priceline deal was found by Cheapflights users on 2/9. 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.
Mon 2/233:49 pm
STL
- SJU
1 stop6h 54m
Frontier
Wed 3/45:25 pm
SJU
- STL
1 stop7h 02m
Frontier
Deal found 2/9![Frontier logo]()
$188
This Frontier deal was found by Cheapflights users on 2/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/33:49 pm
STL
- SJU
1 stop9h 04m
Frontier
Sat 3/75:55 pm
SJU
- STL
1 stop7h 24m
Frontier
Deal found 2/10![Frontier logo]()
$197
This Frontier deal was found by Cheapflights users on 2/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/94:55 pm
STL
- SJU
1 stop8h 06m
Frontier
Wed 5/133:19 pm
SJU
- STL
1 stop9h 00m
Frontier
Deal found 2/10![Frontier logo]()
$202
This Frontier deal was found by Cheapflights users on 2/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/33:49 pm
STL
- SJU
1 stop9h 04m
Frontier
Wed 3/113:19 pm
SJU
- STL
1 stop9h 00m
Frontier
Deal found 2/10![Frontier logo]()
$209
This Frontier deal was found by Cheapflights users on 2/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/13:49 pm
STL
- SJU
1 stop9h 04m
Frontier
Sat 3/75:55 pm
SJU
- STL
1 stop7h 24m
Frontier
Deal found 2/10![Frontier logo]()
$211
This CheapOair deal was found by Cheapflights users on 2/10. 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.
Sun 5/34:55 pm
STL
- SJU
1 stop15h 59m
Frontier
Thu 5/76:30 am
SJU
- STL
1 stop17h 49m
Frontier
Deal found 2/10![Frontier logo]()
$213
This Kiwi.com deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/238:22 pm
STL
- SJU
1 stop16h 00m
Multiple Airlines
Tue 3/32:59 am
SJU
- STL
2 stops21h 28m
Multiple Airlines
Deal found 2/9![Multiple Airlines logo]()
$220
This CheapOair deal was found by Cheapflights users on 2/10. 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.
Tue 3/104:51 pm
STL
- SJU
1 stop15h 03m
Frontier
Tue 3/176:30 am
SJU
- STL
1 stop26h 07m
Frontier
Deal found 2/10![Frontier logo]()
$221
This Frontier deal was found by Cheapflights users on 2/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/23:49 pm
STL
- SJU
1 stop9h 04m
Frontier
Tue 3/103:19 pm
SJU
- STL
1 stop9h 00m
Frontier
Deal found 2/10![Frontier logo]()
$223
This Frontier deal was found by Cheapflights users on 2/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/33:49 pm
STL
- SJU
1 stop9h 04m
Frontier
Thu 3/55:25 pm
SJU
- STL
1 stop8h 34m
Frontier
Deal found 2/10![Frontier logo]()
$225
This Kiwi.com deal was found by Cheapflights users on 2/9. 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.
Wed 2/258:17 pm
STL
- SJU
2 stops20h 41m
Multiple Airlines
Fri 2/274:16 pm
SJU
- STL
1 stop16h 35m
Multiple Airlines
Deal found 2/9![Multiple Airlines logo]()
$227
This Priceline deal was found by Cheapflights users on 2/10. 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.
Mon 3/94:51 pm
STL
- SJU
1 stop8h 07m
Frontier
Thu 3/125:30 am
SJU
- STL
1 stop15h 40m
Frontier
Deal found 2/10![Frontier logo]()
$230
Best flights from St. Louis to Luis Munoz Marin IntlDiscover carefully curated flight deals from St. Louis to Luis Munoz Marin Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 11, 2026.
Discover carefully curated flight deals from St. Louis to Luis Munoz Marin Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 11, 2026.
This Frontier deal was found by Cheapflights users on 2/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/23:49 pm
STL
- SJU
1 stop9h 04m
Frontier
Wed 3/45:25 pm
SJU
- STL
1 stop7h 02m
Frontier
Deal found 2/10![Frontier logo]()
$202
This Delta deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/311:43 am
STL
- SJU
1 stop10h 30m
Delta
Sun 5/105:15 pm
SJU
- STL
1 stop7h 44m
Delta
Deal found 2/8![Delta logo]()
$246
This Southwest deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/95:40 am
STL
- SJU
1 stop6h 40m
Southwest
Wed 5/135:35 am
SJU
- STL
2 stops8h 50m
Southwest
Deal found 2/8![Southwest logo]()
$286
This United Airlines deal was found by Cheapflights users on 2/7. 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.
Mon 3/27:41 am
STL
- SJU
2 stops14h 55m
United Airlines
Tue 3/32:05 am
SJU
- STL
2 stops12h 16m
United Airlines
Deal found 2/7![United Airlines logo]()
$336
This American Airlines deal was found by Cheapflights users on 2/10. 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 3/116:20 pm
STL
- SJU
1 stop13h 40m
American Airlines
Tue 3/179:50 am
SJU
- STL
1 stop8h 50m
American Airlines
Deal found 2/10![American Airlines logo]()
$336
This Delta deal was found by Cheapflights users on 2/9. 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.
Wed 4/157:25 am
STL
- SJU
1 stop7h 58m
Delta
Wed 4/225:34 pm
SJU
- STL
1 stop7h 00m
Delta
Deal found 2/9![Delta logo]()
$246
This Delta deal was found by Cheapflights users on 2/10. 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.
Sat 4/117:03 am
STL
- SJU
1 stop8h 15m
Delta
Sat 4/186:15 am
SJU
- STL
1 stop10h 24m
Delta
Deal found 2/10![Delta logo]()
$256
This United Airlines deal was found by Cheapflights users on 2/8. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/187:45 am
STL
- SJU
2 stops15h 05m
United Airlines
Fri 4/241:00 am
SJU
- STL
2 stops10h 45m
United Airlines
Deal found 2/8![United Airlines logo]()
$336
This United Airlines deal was found by Cheapflights users on 2/7. 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.
Sat 5/910:00 am
STL
- SJU
1 stop9h 34m
United Airlines
Wed 5/137:20 am
SJU
- STL
2 stops14h 48m
United Airlines
Deal found 2/7![United Airlines logo]()
$336
This Delta deal was found by Cheapflights users on 2/10. 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.
Wed 3/46:00 am
STL
- SJU
1 stop9h 27m
Delta
Fri 3/66:15 am
SJU
- STL
1 stop10h 32m
Delta
Deal found 2/10![Delta logo]()
$315
This United Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/36:00 am
STL
- SJU
1 stop8h 42m
United Airlines
Wed 5/67:20 am
SJU
- STL
2 stops14h 48m
United Airlines
Deal found 2/9![United Airlines logo]()
$336
Last-minute flights from St. Louis to Luis Munoz Marin IntlDiscover last-minute flight deals from St. Louis to Luis Munoz Marin Intl. Data last updated February 11, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Luis Munoz Marin Intl. Data last updated February 11, 2026 and is based on user searches.
This Priceline deal was found by Cheapflights users on 2/9. 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.
Mon 2/233:49 pm
STL
- SJU
1 stop6h 54m
Frontier
Wed 3/45:25 pm
SJU
- STL
1 stop7h 02m
Frontier
Deal found 2/9![Frontier logo]()
$188
This Kiwi.com deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/238:22 pm
STL
- SJU
1 stop16h 00m
Multiple Airlines
Tue 3/32:59 am
SJU
- STL
2 stops21h 28m
Multiple Airlines
Deal found 2/9![Multiple Airlines logo]()
$220
This Kiwi.com deal was found by Cheapflights users on 2/9. 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.
Wed 2/258:17 pm
STL
- SJU
2 stops20h 41m
Multiple Airlines
Fri 2/274:16 pm
SJU
- STL
1 stop16h 35m
Multiple Airlines
Deal found 2/9![Multiple Airlines logo]()
$227
This Frontier deal was found by Cheapflights users on 2/9. 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.
Thu 2/263:49 pm
STL
- SJU
1 stop9h 04m
Frontier
Sat 3/75:55 pm
SJU
- STL
1 stop7h 24m
Frontier
Deal found 2/9![Frontier logo]()
$232
This Frontier deal was found by Cheapflights users on 2/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/13:49 pm
STL
- SJU
1 stop9h 04m
Frontier
Sat 3/75:55 pm
SJU
- STL
1 stop7h 24m
Frontier
Deal found 2/10![Frontier logo]()
$211
This Frontier deal was found by Cheapflights users on 2/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/23:49 pm
STL
- SJU
1 stop9h 04m
Frontier
Tue 3/103:19 pm
SJU
- STL
1 stop9h 00m
Frontier
Deal found 2/10![Frontier logo]()
$223
This Frontier deal was found by Cheapflights users on 2/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/33:49 pm
STL
- SJU
1 stop9h 04m
Frontier
Sat 3/75:55 pm
SJU
- STL
1 stop7h 24m
Frontier
Deal found 2/10![Frontier logo]()
$197
This Frontier deal was found by Cheapflights users on 2/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/33:49 pm
STL
- SJU
1 stop9h 04m
Frontier
Wed 3/113:19 pm
SJU
- STL
1 stop9h 00m
Frontier
Deal found 2/10![Frontier logo]()
$209
This Frontier deal was found by Cheapflights users on 2/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/33:49 pm
STL
- SJU
1 stop9h 04m
Frontier
Thu 3/55:25 pm
SJU
- STL
1 stop8h 34m
Frontier
Deal found 2/10![Frontier logo]()
$225
This Priceline deal was found by Cheapflights users on 2/10. 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.
Mon 3/94:51 pm
STL
- SJU
1 stop8h 07m
Frontier
Thu 3/125:30 am
SJU
- STL
1 stop15h 40m
Frontier
Deal found 2/10![Frontier logo]()
$230
This Priceline deal was found by Cheapflights users on 2/9. 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.
Tue 3/104:51 pm
STL
- SJU
1 stop8h 12m
Frontier
Mon 3/163:08 am
SJU
- STL
1 stop29h 29m
Frontier
Deal found 2/9![Frontier logo]()
$202
One-way flights from St. Louis to Luis Munoz Marin IntlSearch for one-way flight options from St. Louis to Luis Munoz Marin Intl. Find affordable one-way fares based on user searches. Data last updated February 11, 2026.
Search for one-way flight options from St. Louis to Luis Munoz Marin Intl. Find affordable one-way fares based on user searches. Data last updated February 11, 2026.
This Priceline deal was found by Cheapflights users on 2/9. 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.
Tue 3/33:49 pm
STL
- SJU
1 stop6h 54m
Frontier
Deal found 2/9![Frontier logo]()
$87
This Trip.com deal was found by Cheapflights users on 2/9. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/218:17 pm
STL
- SJU
1 stop16h 05m
Multiple Airlines
Deal found 2/9![Multiple Airlines logo]()
$97
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Mon 3/28:22 pm
STL
- SJU
2 stops20h 36m
Multiple Airlines
Deal found 2/10![Multiple Airlines logo]()
$98
This Frontier deal was found by Cheapflights users on 2/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/184:55 pm
STL
- SJU
1 stop8h 06m
Frontier
Deal found 2/11![Frontier logo]()
$101
This Priceline deal was found by Cheapflights users on 2/9. 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.
Wed 4/224:55 pm
STL
- SJU
1 stop28h 53m
Frontier
Deal found 2/9![Frontier logo]()
$107
This Expedia deal was found by Cheapflights users on 2/9. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/94:51 pm
STL
- SJU
1 stop8h 07m
Frontier
Deal found 2/9![Frontier logo]()
$110
This Kiwi.com deal was found by Cheapflights users on 2/10. 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 2/288:17 pm
STL
- SJU
2 stops20h 41m
Multiple Airlines
Deal found 2/10![Multiple Airlines logo]()
$117
This Orbitz deal was found by Cheapflights users on 2/10. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/194:51 pm
STL
- SJU
1 stop8h 07m
Frontier
Deal found 2/10![Frontier logo]()
$120
This Kiwi.com deal was found by Cheapflights users on 2/9. 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.
Wed 2/258:17 pm
STL
- SJU
2 stops20h 41m
Multiple Airlines
Deal found 2/9![Multiple Airlines logo]()
$121
This Priceline deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/24:55 pm
STL
- SJU
1 stop8h 06m
Frontier
Deal found 2/11![Frontier logo]()
$122
This American Airlines deal was found by Cheapflights users on 2/9. 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.
Tue 4/145:46 am
STL
- SJU
2 stops11h 24m
American Airlines
Deal found 2/9![American Airlines logo]()
$123
Find flight deals from St. Louis to Luis Munoz Marin Intl
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Luis Munoz Marin Intl (SJU). 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 February 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $188 (Priceline) |
One-way from | $87 (Priceline) |
Popular in | December |
Cheapest in | September |
Average price | $465 |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Luis Munoz Marin Intl 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 February 11, 2026.
Use the filters below to find and compare flights from St. Louis to San Juan Luis Munoz Marin Intl Airport that are best for you.
Fly from
St. Louis
Fly to
Luis Munoz Marin Intl
Route
Depart
Return
Price
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Mon 3/2
3:49 pm-2:53 am
1 stop9h 04m
San Juan Luis Munoz Marin Intl
Wed 3/4
5:25 pm-10:27 pm
1 stop7h 02m
$202
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Sun 5/3
11:43 am-11:13 pm
1 stop10h 30m
San Juan Luis Munoz Marin Intl
Sun 5/10
5:15 pm-11:59 pm
1 stop7h 44m
$246
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Wed 4/15
7:25 am-4:23 pm
1 stop7h 58m
San Juan Luis Munoz Marin Intl
Wed 4/22
5:34 pm-11:34 pm
1 stop7h 00m
$246
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Sat 4/11
7:03 am-4:18 pm
1 stop8h 15m
San Juan Luis Munoz Marin Intl
Sat 4/18
6:15 am-3:39 pm
1 stop10h 24m
$256
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Sat 5/9
5:40 am-1:20 pm
1 stop6h 40m
San Juan Luis Munoz Marin Intl
Wed 5/13
5:35 am-1:25 pm
2 stops8h 50m
$286
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Wed 3/4
6:00 am-5:27 pm
1 stop9h 27m
San Juan Luis Munoz Marin Intl
Fri 3/6
6:15 am-2:47 pm
1 stop10h 32m
$315
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Mon 3/2
7:41 am-12:36 am
2 stops14h 55m
San Juan Luis Munoz Marin Intl
Tue 3/3
2:05 am-12:21 pm
2 stops12h 16m
$336
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Wed 3/11
6:20 pm-9:00 am
1 stop13h 40m
San Juan Luis Munoz Marin Intl
Tue 3/17
9:50 am-5:40 pm
1 stop8h 50m
$336
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Sat 4/18
7:45 am-11:50 pm
2 stops15h 05m
San Juan Luis Munoz Marin Intl
Fri 4/24
1:00 am-10:45 am
2 stops10h 45m
$336
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Sat 5/9
10:00 am-8:34 pm
1 stop9h 34m
San Juan Luis Munoz Marin Intl
Wed 5/13
7:20 am-9:08 pm
2 stops14h 48m
$336
Showing 1-10 of 23 results
Compare providers for flights from St. Louis to Luis Munoz Marin Intl
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Luis Munoz Marin Intl in February.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on St. Louis-San Juan Luis Munoz Marin Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-San Juan Luis Munoz Marin Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-San Juan Luis Munoz Marin Intl Airport flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-San Juan Luis Munoz Marin Intl Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-San Juan Luis Munoz Marin Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from St. Louis to Luis Munoz Marin Intl
Have a flexible travel schedule? Discover the best time to fly to Luis Munoz Marin Intl from St. Louis with our price prediction graph.
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 Luis Munoz Marin Intl Airport
Prices
Delays
How far ahead should I book a flight from St. Louis to San Juan Luis Munoz Marin Intl Airport?
Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Luis Munoz Marin Intl. Price data was last updated on February 6, 2026.
Booking 75 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis to San Juan Luis Munoz Marin Intl Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
What is the cheapest month to book a flight from St. Louis to San Juan Luis Munoz Marin Intl Airport?
Currently, May is the cheapest month in which you can book a flight from St. Louis to San Juan Luis Munoz Marin Intl Airport (average of $142). Flying from St. Louis to San Juan Luis Munoz Marin Intl Airport in June is currently the most expensive (average of $239). 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 Luis Munoz Marin Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 11, 2026.
When flying from St. Louis to San Juan Luis Munoz Marin Intl Airport, 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 San Juan delayed?
About 19% of weekly flights between St. Louis and San Juan have experienced delays in the past year, with the average delay time being 85 minutes.
What is the most punctual flight time for St. Louis to San Juan flights?
Historically, flights departing in the early afternoon are less likely to be delayed, whereas flights leaving in the morning 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 17% of flights being delayed.
Reviews of airlines servicing Luis Munoz Marin Intl
Get insights into the airlines that provide service to Luis Munoz Marin Intl. 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 Luis Munoz Marin Intl. Reviews last updated February 11, 2026.
Read through reviews of airlines operating flights from St. Louis to San Juan Luis Munoz Marin Intl Airport, such as Southwest, Delta, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Overall
8.0
Crew
8.6
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Crew
8.6
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Crew
8.6
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Crew
8.6
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Crew
8.6
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Crew
8.6
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Luis Munoz Marin Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near San Juan Luis Munoz Marin Intl Airport?
Book flights to San Juan Luis Munoz Marin Intl Airport if you plan to visit one of these locationsFajardo
Dorado
Luquillo
Rio Grande
Humacao
Bayamón
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Other flights to Luis Munoz Marin Intl
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St. Louis and Luis Munoz Marin Intl flights
Browse other St. Louis and Luis Munoz Marin Intl flight options. Last updated on February 11, 2026.
Other flights from St. Louis
Browse through other flights departing from St. Louis. Flights are based on user searches made on Cheapflights and were last updated on February 11, 2026.
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Top 6 airlines flying from St. Louis to Luis Munoz Marin Intl
Discover the top 6 airlines that operate flights from St. Louis to Luis Munoz Marin Intl. 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 February 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$137 | Average$307 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$146 | Average$329 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$180 | Average$390 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$219 | Average$548 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$225 | Average$379 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$238 | Average$523 | FlexibilityNo cancel fee | On-time71% |