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Puerto Rico

$103+ 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 11/9. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SJU
sie 18 — sie 251
pon. 8/18
pon. 8/25
1 adult, Economy
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Cheap 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 Sierpień 13, 2025.

Round-trip from

$205
(American Airlines)

One-way from

$103
(American Airlines)

Popular in

December

Cheapest in

September

Average price

$462
From Lambert-St Louis to Puerto Rico
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One-way flight from Lambert-St Louis to Puerto Rico
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Highest demand for flights based on searches. 7% potential increase in price ($35 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from St. Louis to Puerto Rico

Cheapest flights from St. Louis to Puerto Rico
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 Sierpień 13, 2025.

This American Airlines deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
pon. 9/228:23 amSTL - SJU
2 stops14h 14mAmerican Airlines
sob. 9/273:05 pmSJU - STL
1 stop8h 45mAmerican Airlines
Deal found 8/11$205
This Delta deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
wt. 12/96:00 amSTL - SJU
1 stop6h 15mDelta
pt. 12/123:30 pmSJU - STL
1 stop10h 09mDelta
Deal found 8/12$265
This FlightHub deal was found by Cheapflights users on 8/11. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ndz. 9/2110:35 amSTL - SJU
1 stop23h 29mSpirit Airlines
sob. 9/273:19 pmSJU - STL
2 stops19h 21mSpirit Airlines
Deal found 8/11$271
This United Airlines deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
wt. 11/186:30 amSTL - SJU
1 stop7h 10mUnited Airlines
pt. 11/212:05 amSJU - STL
2 stops14h 20mUnited Airlines
Deal found 8/11$275
This Cheapflightsfares deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
czw. 8/282:30 pmSTL - SJU
2 stops9h 26mSpirit Airlines
sob. 8/302:11 amSJU - STL
2 stops12h 21mSpirit Airlines
Deal found 8/12$277
This American Airlines deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sob. 10/45:18 amSTL - SJU
1 stop7h 57mAmerican Airlines
wt. 10/77:45 amSJU - STL
1 stop16h 20mAmerican Airlines
Deal found 8/11$278
This American Airlines deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
pt. 10/176:00 amSTL - SJU
1 stop16h 59mAmerican Airlines
ndz. 10/197:10 amSJU - STL
1 stop17h 48mAmerican Airlines
Deal found 8/11$284
This FlightHub deal was found by Cheapflights users on 8/11. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sob. 10/187:00 pmSTL - SJU
1 stop15h 11mSpirit Airlines
pt. 10/242:48 amSJU - STL
2 stops16h 07mSpirit Airlines
Deal found 8/11$292
This United Airlines deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
pon. 9/226:35 amSTL - SJU
1 stop7h 09mUnited Airlines
pt. 9/261:05 amSJU - STL
2 stops14h 22mUnited Airlines
Deal found 8/11$295
This FlightHub deal was found by Cheapflights users on 8/11. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
pt. 9/261:57 pmSTL - SJU
1 stop11h 37mMultiple Airlines
pt. 10/172:48 amSJU - STL
2 stops16h 07mMultiple Airlines
Deal found 8/11$301

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 Sierpień 13, 2025.
Use the filters below to find and compare flights from St. Louis to Puerto Rico that are best for you.

Fly from

St. Louis

Fly to

Puerto Rico

Route

Depart

Return

Price

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

śr. 10/15

8:42 am-10:10 pm

2 stops12h 28m

San Juan Luis Munoz Marin Intl

śr. 10/29

5:30 am-4:03 pm

1 stop11h 33m

$205

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

czw. 11/13

7:50 am-9:45 pm

1 stop11h 55m

San Juan Luis Munoz Marin Intl

wt. 11/18

11:20 am-3:55 pm

1 stop6h 35m

$205

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

sob. 10/18

6:00 am-2:11 pm

1 stop7h 11m

San Juan Luis Munoz Marin Intl

sob. 10/25

3:30 pm-11:06 pm

1 stop8h 36m

$205

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

pt. 10/3

5:18 am-2:15 pm

1 stop7h 57m

San Juan Luis Munoz Marin Intl

pt. 10/10

3:50 pm-8:16 am

1 stop17h 26m

$205

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

sob. 10/25

6:00 am-2:11 pm

1 stop7h 11m

San Juan Luis Munoz Marin Intl

sob. 11/1

3:30 pm-11:07 pm

1 stop8h 37m

$205

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

wt. 11/18

6:00 am-11:47 pm

1 stop15h 47m

San Juan Luis Munoz Marin Intl

sob. 11/22

6:25 am-8:55 pm

1 stop16h 30m

$205

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

pon. 9/22

8:23 am-11:37 pm

2 stops14h 14m

San Juan Luis Munoz Marin Intl

sob. 9/27

3:05 pm-10:50 pm

1 stop8h 45m

$205

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

sob. 10/18

10:23 am-11:05 pm

1 stop11h 42m

San Juan Luis Munoz Marin Intl

sob. 10/25

3:34 pm-11:18 pm

1 stop8h 44m

$205

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

ndz. 9/21

5:18 am-2:15 pm

1 stop7h 57m

San Juan Luis Munoz Marin Intl

sob. 9/27

3:05 pm-10:50 pm

1 stop8h 45m

$205

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

ndz. 11/9

6:00 am-11:47 pm

1 stop15h 47m

$103

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/11

Showing 1-10 of 17 results
1
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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.
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

What is the cheapest month to book a flight from St. Louis to Puerto Rico?

Currently, September is the cheapest month in which you can book a flight from St. Louis to Puerto Rico (average of $254). Flying from St. Louis to Puerto Rico in June is currently the most expensive (average of $339). 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 Sierpień 13, 2025.

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.

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 Sierpień 13, 2025.
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.
Southwest
8.0
Very good
4,246 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Food

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,246 reviews
Southwest
8.0
Very good
4,246 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Food

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
8.0
Very good
7,979 reviews
Southwest
8.0
Very good
4,246 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Food

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,920 reviews
Southwest
8.0
Very good
4,246 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Food

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,246 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Food

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,221 reviews
Southwest
8.0
Very good
4,246 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Food

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

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.

  • What airport do you fly from for flights from St. Louis to Puerto Rico?

    Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to Puerto Rico. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

  • Can I find deals for flights from St. Louis to Puerto Rico that include hotel bookings?

    Yes. In addition to deals on St. Louis to Puerto Rico flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Puerto Rico?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Puerto Rico.

  • Can I find deals for business class flights from St. Louis to Puerto Rico?

    Yes. Cheapflights offers flight deals from St. Louis to Puerto Rico by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from St. Louis to Puerto Rico?

    Currently, September is the cheapest month in which you can book a flight from St. Louis to Puerto Rico (average of $254). Flying from St. Louis to Puerto Rico in June is currently the most expensive (average of $339). 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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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.
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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 Sierpień 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$140Average$261FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$170Average$329FlexibilityNo cancel feeOn-time65%
DeltaCheapest$209Average$385FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$219Average$377FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$219Average$592FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$257Average$503FlexibilityNo cancel feeOn-time71%

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