$87+ 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 2/18. Fares are subject to change and may not be available on all flights or dates of travel.
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
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 January 22, 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 January 22, 2026.
This Frontier deal was found by Cheapflights users on 1/20. 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.
This CheapOair deal was found by Cheapflights users on 1/19. 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.
This CheapOair deal was found by Cheapflights users on 1/20. 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.
This CheapOair deal was found by Cheapflights users on 1/20. 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.
This CheapOair deal was found by Cheapflights users on 1/20. 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.
This CheapOair deal was found by Cheapflights users on 1/20. 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.
This CheapOair deal was found by Cheapflights users on 1/20. 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.
This Kiwi.com deal was found by Cheapflights users on 1/20. 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.
This CheapOair deal was found by Cheapflights users on 1/20. 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.
This CheapOair deal was found by Cheapflights users on 1/21. 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.
This Kiwi.com deal was found by Cheapflights users on 1/19. 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.
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 January 22, 2026.
Round-trip from | $178 (Frontier) |
|---|---|
One-way from | $87 (Priceline) |
Popular in | December |
Cheapest in | September |
Average price | $438 |
Cheapflights Fare Finder
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
Price
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Thu 4/9
11:21 am-12:52 am
1 stop12h 31m
San Juan Luis Munoz Marin Intl
Mon 4/13
9:10 pm-11:19 pm
1 stop27h 09m
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Thu 2/5
5:42 pm-10:24 am
1 stop14h 42m
San Juan Luis Munoz Marin Intl
Mon 2/9
4:36 pm-11:33 pm
1 stop8h 57m
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Mon 2/2
10:16 am-3:26 pm
1 stop27h 10m
San Juan Luis Munoz Marin Intl
Sun 2/8
6:00 am-9:21 am
1 stop29h 21m
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Mon 5/11
2:25 pm-11:25 pm
1 stop8h 00m
San Juan Luis Munoz Marin Intl
Sat 5/16
6:25 am-12:55 pm
1 stop7h 30m
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Sun 5/3
11:43 am-10:54 pm
1 stop10h 11m
San Juan Luis Munoz Marin Intl
Wed 5/6
6:15 am-12:06 pm
1 stop6h 51m
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Tue 5/5
7:15 am-4:15 pm
1 stop8h 00m
San Juan Luis Munoz Marin Intl
Thu 5/7
6:15 am-12:54 pm
1 stop7h 39m
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Wed 4/15
7:05 am-6:06 pm
2 stops10h 01m
San Juan Luis Munoz Marin Intl
Wed 4/22
11:59 pm-11:37 am
1 stop12h 38m
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Fri 5/1
2:25 pm-11:25 pm
1 stop8h 00m
San Juan Luis Munoz Marin Intl
Sat 5/9
1:45 pm-7:10 pm
1 stop6h 25m
St. LouisSan Juan
STL - SJU
STLSJU
Lambert-St Louis
Sat 5/2
7:05 am-7:05 pm
1 stop11h 00m
San Juan Luis Munoz Marin Intl
Fri 5/8
2:00 pm-11:15 pm
2 stops10h 15m
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
Wed 3/4
7:40 am-3:38 pm
1 stop9h 58m
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.
Cheapflights Insights
Everything you need to know about your flight from St. Louis to Puerto Rico
What is the cheapest month to book a flight from St. Louis to Puerto Rico?
Currently, May is the cheapest month in which you can book a flight from St. Louis to Puerto Rico (average of $142). Flying from St. Louis to Puerto Rico in June is currently the most expensive (average of $251). 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 January 22, 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 20% of weekly flights between St. Louis and Puerto Rico 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 Puerto Rico 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 Puerto Rico flights?
Over the last year, Southwest have had the lowest number of delays on this route, with just 18% 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 January 22, 2026.
Get a feel of what it's like to fly with Southwest, Delta, and United 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
Boarding
Overall
Food
Crew
Comfort
Reviews
Thomas,Dec 2025
SEA - DEN
Entertainment
Boarding
Overall
Food
Crew
Comfort
Reviews
Thomas,Dec 2025
SEA - DEN
Entertainment
Boarding
Overall
Food
Crew
Comfort
Reviews
Thomas,Dec 2025
SEA - DEN
Entertainment
Boarding
Overall
Food
Crew
Comfort
Reviews
Thomas,Dec 2025
SEA - DEN
Entertainment
Boarding
Overall
Food
Crew
Comfort
Reviews
Thomas,Dec 2025
SEA - DEN
Entertainment
Boarding
Overall
Food
Crew
Comfort
Reviews
Thomas,Dec 2025
SEA - DEN
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.
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 January 22, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$133 | Average$277 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$146 | Average$329 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$180 | Average$392 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$219 | Average$567 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$225 | Average$382 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$234 | Average$523 | FlexibilityNo cancel fee | On-time71% |