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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 10/25. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SJU
Aug 4 — Aug 111
Mon 8/4
Mon 8/11
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 July 30, 2025.

Round-trip from

$205
(Southwest)

One-way from

$103
(Delta)

Popular in

December

Cheapest in

September

Average price

$545
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. 6% potential increase in price ($32 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 30, 2025.

This Southwest deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/213:25 pmSTL - SJU
1 stop7h 25mSouthwest
Sat 10/255:45 amSJU - STL
1 stop12h 20mSouthwest
Deal found 7/30$205
This Priceline deal was found by Cheapflights users on 7/29. 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 8/135:40 pmSTL - SJU
1 stop14h 24mFrontier
Sat 8/169:30 pmSJU - STL
1 stop27h 17mFrontier
Deal found 7/29$239
This CheapOair deal was found by Cheapflights users on 7/29. 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.
Fri 9/191:57 pmSTL - SJU
1 stop11h 37mMultiple Airlines
Wed 9/241:59 amSJU - STL
2 stops9h 51mMultiple Airlines
Deal found 7/29$247
This Cheapflightsfares deal was found by Cheapflights users on 7/29. 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.
Sun 8/242:30 pmSTL - SJU
2 stops9h 26mSpirit Airlines
Thu 8/282:11 amSJU - STL
2 stops12h 21mSpirit Airlines
Deal found 7/29$249
This Delta deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/96:00 amSTL - SJU
1 stop6h 15mDelta
Fri 12/123:25 pmSJU - STL
1 stop7h 10mDelta
Deal found 7/30$255
This United Airlines deal was found by Cheapflights users on 7/29. 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.
Tue 10/216:15 amSTL - SJU
1 stop8h 27mUnited Airlines
Fri 10/241:05 amSJU - STL
2 stops14h 22mUnited Airlines
Deal found 7/29$295
This American Airlines deal was found by Cheapflights users on 7/30. 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.
Fri 8/226:00 amSTL - SJU
1 stop15h 49mAmerican Airlines
Fri 8/291:36 pmSJU - STL
2 stops11h 15mAmerican Airlines
Deal found 7/30$300

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 July 30, 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

Tue 10/21

3:25 pm-11:50 pm

1 stop7h 25m

San Juan Luis Munoz Marin Intl

Sat 10/25

5:45 am-5:05 pm

1 stop12h 20m

$205

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Mon 9/15

1:26 pm-10:00 pm

1 stop7h 34m

San Juan Luis Munoz Marin Intl

Fri 9/19

12:58 pm-11:24 pm

1 stop11h 26m

$215

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 8/13

5:40 pm-9:04 am

1 stop14h 24m

San Juan Luis Munoz Marin Intl

Sat 8/16

9:30 pm-11:47 pm

1 stop27h 17m

$239

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 9/19

1:57 pm-2:34 am

1 stop11h 37m

San Juan Luis Munoz Marin Intl

Wed 9/24

1:59 am-10:50 am

2 stops9h 51m

$247

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sun 8/24

2:30 pm-12:56 am

2 stops9h 26m

San Juan Luis Munoz Marin Intl

Thu 8/28

2:11 am-1:32 pm

2 stops12h 21m

$249

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Tue 9/16

11:05 am-8:38 pm

1 stop8h 33m

San Juan Luis Munoz Marin Intl

Fri 9/19

1:05 am-2:19 pm

2 stops14h 14m

$295

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 8/22

6:00 am-10:49 pm

1 stop15h 49m

San Juan Luis Munoz Marin Intl

Fri 8/29

1:36 pm-11:51 pm

2 stops11h 15m

$300

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 10/25

12:25 pm-11:57 pm

2 stops10h 32m

$103

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sun 8/31

10:20 am-10:07 pm

1 stop10h 47m

$108

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 8/9

5:40 pm-2:39 am

1 stop7h 59m

$119

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 14 results
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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 July 30, 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 July 30, 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
4,241 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Southwest
8.0
Very good
4,241 reviews
Southwest
8.0
Very good
4,241 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Delta
8.0
Very good
7,980 reviews
Southwest
8.0
Very good
4,241 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
United Airlines
7.4
Good
8,896 reviews
Southwest
8.0
Very good
4,241 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,241 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Spirit Airlines
6.3
Okay
8,048 reviews
Southwest
8.0
Very good
4,241 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

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.

  • What are the cheapest airlines to fly from St. Louis to Puerto Rico one-way?

    For one-way options, check prices for Delta. According to our data, you can fly for as low as $103. Users have also found prices from $119 and $120 on Frontier and Spirit Airlines, respectively.

  • 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

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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 July 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$140Average$259FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$155Average$319FlexibilityNo cancel feeOn-time65%
DeltaCheapest$218Average$392FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$219Average$381FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$219Average$593FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$255Average$497FlexibilityNo cancel feeOn-time71%

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