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Puerto Rico

$96+ 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 7/6. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SJU
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$197
(Priceline)

One-way from

$96
(Booking.com)

Popular in

June

Cheapest in

September

Average price

$552

Good round-trip deal

$566 or less
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. 15% potential increase in price ($83 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Price to beat on a round-trip flight from Lambert-St Louis to Puerto Rico.
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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 June 12, 2025.

This Priceline deal was found by Cheapflights users on 6/10. 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.
Thu 10/92:22 pmSTL - SJU
1 stop8h 32mFrontier
Sat 10/113:40 amSJU - STL
1 stop10h 47mFrontier
Deal found 6/10$197
This Delta deal was found by Cheapflights users on 6/10. 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.
Tue 12/911:51 amSTL - SJU
1 stop9h 26mDelta
Fri 12/123:25 pmSJU - STL
1 stop7h 10mDelta
Deal found 6/10$219
This Priceline deal was found by Cheapflights users on 6/9. 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 9/18:44 amSTL - SJU
1 stop7h 02mMultiple Airlines
Thu 9/43:40 amSJU - STL
1 stop10h 37mMultiple Airlines
Deal found 6/9$233
This American Airlines deal was found by Cheapflights users on 6/9. 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.
Sun 8/316:00 amSTL - SJU
1 stop15h 49mAmerican Airlines
Sat 9/64:45 pmSJU - STL
1 stop16h 20mAmerican Airlines
Deal found 6/9$244
This Mytrip deal was found by Cheapflights users on 6/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/46:36 pmSTL - SJU
2 stops16h 21mSpirit Airlines
Wed 7/93:50 pmSJU - STL
1 stop25h 41mSpirit Airlines
Deal found 6/11$280
This United Airlines deal was found by Cheapflights users on 6/11. 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.
Fri 7/43:20 pmSTL - SJU
1 stop7h 34mUnited Airlines
Tue 7/81:10 amSJU - STL
2 stops12h 17mUnited Airlines
Deal found 6/11$335
This Southwest deal was found by Cheapflights users on 6/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/167:45 amSTL - SJU
2 stops13h 10mSouthwest
Thu 10/235:00 amSJU - STL
1 stop12h 25mSouthwest
Deal found 6/10$342

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 June 12, 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

Thu 10/9

2:22 pm-11:54 pm

1 stop8h 32m

San Juan Luis Munoz Marin Intl

Sat 10/11

3:40 am-1:27 pm

1 stop10h 47m

$197

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Tue 12/9

11:51 am-11:17 pm

1 stop9h 26m

San Juan Luis Munoz Marin Intl

Fri 12/12

3:25 pm-8:35 pm

1 stop7h 10m

$219

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Mon 9/1

8:44 am-4:46 pm

1 stop7h 02m

San Juan Luis Munoz Marin Intl

Thu 9/4

3:40 am-1:17 pm

1 stop10h 37m

$233

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sun 8/31

6:00 am-10:49 pm

1 stop15h 49m

San Juan Luis Munoz Marin Intl

Sat 9/6

4:45 pm-8:05 am

1 stop16h 20m

$244

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 7/25

10:47 am-11:32 am

1 stop23h 45m

San Juan Luis Munoz Marin Intl

Wed 7/30

1:37 am-9:52 am

1 stop9h 15m

$275

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 7/4

3:20 pm-11:54 pm

1 stop7h 34m

San Juan Luis Munoz Marin Intl

Tue 7/8

1:10 am-12:27 pm

2 stops12h 17m

$335

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Thu 10/16

7:45 am-9:55 pm

2 stops13h 10m

San Juan Luis Munoz Marin Intl

Thu 10/23

5:00 am-4:25 pm

1 stop12h 25m

$342

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sun 7/6

6:36 pm-10:39 am

1 stop15h 03m

$96

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 8/22

3:16 pm-2:50 am

1 stop10h 34m

$99

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 9/6

10:15 am-10:07 pm

1 stop10h 52m

$110

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

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 June 12, 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.

Rainfall in Puerto Rico by month

Plan your trip to Puerto Rico by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Puerto Rico ranges from 2.2 - 6.1 inches per month. November is typically the wettest month, when rainfall can reach 6.1 in. February is typically the driest time to visit Puerto Rico when rainfall is around 2.2 in.

Temperature in Puerto Rico by month

Plan your trip to Puerto Rico by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Puerto Rico, use this chart to help with planning. For those seeking warmer temperatures, June is the ideal time of year to visit, when temperatures reach an average of 82.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 77.0 F).

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 June 12, 2025.
Read through reviews of airlines operating flights from St. Louis to Puerto Rico, such as Southwest, Delta and United Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,287 reviews

Food

7.1

Entertainment

7.6

Boarding

8.2

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Southwest
8.0
Very good
4,287 reviews
Southwest
8.0
Very good
4,287 reviews

Food

7.1

Entertainment

7.6

Boarding

8.2

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Delta
8.0
Very good
7,946 reviews
Southwest
8.0
Very good
4,287 reviews

Food

7.1

Entertainment

7.6

Boarding

8.2

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
United Airlines
7.4
Good
8,790 reviews
Southwest
8.0
Very good
4,287 reviews

Food

7.1

Entertainment

7.6

Boarding

8.2

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,287 reviews

Food

7.1

Entertainment

7.6

Boarding

8.2

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Spirit Airlines
6.3
Okay
8,052 reviews
Southwest
8.0
Very good
4,287 reviews

Food

7.1

Entertainment

7.6

Boarding

8.2

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

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 Spirit Airlines. According to our data, you can fly for as low as $96. Users have also found prices from $99 and $110 on Frontier and Delta, respectively.

  • What are the cheapest flights from St. Louis to Puerto Rico?

    The cheapest flight price from St. Louis to Puerto Rico is $566. On average you can expect to pay $660. The most popular route, (Lambert-St Louis - San Juan Luis Munoz Marin Intl), can usually be booked for $219.

  • 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$140Average$251FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$155Average$290FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$219Average$385FlexibilityNo cancel feeOn-time69%
DeltaCheapest$244Average$396FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$254Average$495FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$351Average$597FlexibilityNo cancel feeOn-time63%

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