HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Puerto Rico

$105+ 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 5/3. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SJU
Apr 2 — Apr 91
Wed 4/2
Wed 4/9
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.
3. Compare prices and book
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

Keep the following information in mind while searching for St. Louis to Puerto Rico flight deals. Data was last updated March 28, 2025.

Round-trip from

$209
(Southwest)

One-way from

$105
(United Airlines)

Popular in

December

Cheapest in

August

Average price

$479
From Lambert-St Louis to Puerto Rico
Search Deals
One-way flight from Lambert-St Louis to Puerto Rico
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($17 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2025
Search Deals

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 March 28, 2025.

This Southwest deal was found by Cheapflights users on 3/27. 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.
Sun 4/274:35 pmSTL - SJU
1 stop6h 05mSouthwest
Thu 5/15:35 amSJU - STL
1 stop8h 55mSouthwest
Deal found 3/27$209
This Delta deal was found by Cheapflights users on 3/27. 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 4/2612:47 pmSTL - SJU
1 stop6h 36mDelta
Sat 5/36:15 amSJU - STL
1 stop6h 26mDelta
Deal found 3/27$261
This Mytrip deal was found by Cheapflights users on 3/27. 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.
Thu 4/246:10 pmSTL - SJU
2 stops28h 36mSpirit Airlines
Thu 5/19:25 amSJU - STL
1 stop8h 50mSpirit Airlines
Deal found 3/27$285
This American Airlines deal was found by Cheapflights users on 3/27. 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.
Sat 5/36:15 amSTL - SJU
1 stop16h 54mAmerican Airlines
Wed 5/76:10 amSJU - STL
1 stop17h 09mAmerican Airlines
Deal found 3/27$286
This United Airlines deal was found by Cheapflights users on 3/27. 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 4/261:12 pmSTL - SJU
1 stop9h 42mUnited Airlines
Fri 5/21:05 amSJU - STL
2 stops10h 58mUnited Airlines
Deal found 3/27$287
This CheapOair deal was found by Cheapflights users on 3/27. 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 4/44:57 pmSTL - SJU
1 stop19h 19mFrontier
Sun 4/69:35 pmSJU - STL
1 stop27h 11mFrontier
Deal found 3/27$298
This Booking.com deal was found by Cheapflights users on 3/27. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/810:10 amSTL - SJU
1 stop7h 57mMultiple Airlines
Mon 5/129:30 pmSJU - STL
1 stop27h 36mMultiple Airlines
Deal found 3/27$310
This United deal was found by Cheapflights users on 3/28. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/46:30 amSTL - CPX
2 stops9h 51mUnited Airlines
Wed 5/1410:48 amCPX - STL
2 stops12h 15mUnited Airlines
Deal found 3/28$1,557

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 March 28, 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

Sun 4/27

4:35 pm-11:40 pm

1 stop6h 05m

San Juan Luis Munoz Marin Intl

Thu 5/1

5:35 am-1:30 pm

1 stop8h 55m

$209

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 4/26

12:47 pm-8:23 pm

1 stop6h 36m

San Juan Luis Munoz Marin Intl

Sat 5/3

6:15 am-11:41 am

1 stop6h 26m

$261

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Thu 4/24

6:10 pm-11:46 pm

2 stops28h 36m

San Juan Luis Munoz Marin Intl

Thu 5/1

9:25 am-5:15 pm

1 stop8h 50m

$285

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 5/3

6:15 am-12:09 am

1 stop16h 54m

San Juan Luis Munoz Marin Intl

Wed 5/7

6:10 am-10:19 pm

1 stop17h 09m

$286

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 4/26

1:12 pm-11:54 pm

1 stop9h 42m

San Juan Luis Munoz Marin Intl

Fri 5/2

1:05 am-11:03 am

2 stops10h 58m

$287

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 5/2

5:55 pm-2:51 am

1 stop7h 56m

San Juan Luis Munoz Marin Intl

Fri 5/9

3:56 am-12:06 am

1 stop21h 10m

$298

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Thu 5/8

10:10 am-7:07 pm

1 stop7h 57m

San Juan Luis Munoz Marin Intl

Mon 5/12

9:30 pm-12:06 am

1 stop27h 36m

$310

St. LouisCulebra

STL - CPX

STLCPX

Lambert-St Louis

Sun 5/4

6:30 am-5:21 pm

2 stops9h 51m

Culebra

Wed 5/14

10:48 am-10:03 pm

2 stops12h 15m

$1,557

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 5/3

9:40 am-11:57 pm

2 stops13h 17m

$105

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Tue 5/13

6:00 am-10:30 pm

1 stop15h 30m

$107

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/27

Showing 1-10 of 14 results
1
2

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 December is currently the most expensive (average of $336). 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 March 28, 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 March 28, 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
8.1
Very good
4,273 reviews

Crew

8.6

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Southwest
8.1
Very good
4,273 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Delta
8.0
Very good
7,896 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
United Airlines
7.4
Good
8,603 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Spirit Airlines
6.3
Okay
7,881 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

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 United Airlines. According to our data, you can fly for as low as $105. Users have also found prices from $107 and $148 on American Airlines and Frontier, 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 December is currently the most expensive (average of $336). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to Puerto Rico

See prices for flight routes from nearby airports that may be better suited for you.
St. Louis to Luis Munoz Marin Intl flights
St. Louis to Punta Cana flights
Kansas City to Luis Munoz Marin Intl flights
Kansas City to Saint Thomas Island flights
St. Louis to Montego Bay flights
Kansas City to Montego Bay flights
St. Louis to Saint Thomas Island flights
Kansas City to Nassau flights
Kansas City to Punta Cana flights
Springfield to Luis Munoz Marin Intl flights
St. Louis to George Town flights
Kansas City to George Town flights
Kansas City to Oranjestad flights
St. Louis to Nassau flights
St. Louis to Providenciales flights
Kansas City to Christiansted flights
St. Louis to Oranjestad flights
St. Louis to Willemstad flights
St. Louis to Castries flights
St. Louis to Kingston flights
St. Louis to Simpson Bay flights
Kansas City to Providenciales flights
Kansas City to Santo Domingo flights
Kansas City to Willemstad flights
Kansas City to Castries flights
St. Louis to Christiansted flights
St. Louis to Bridgetown flights
Kansas City to Santiago de los Caballeros flights
Kansas City to Simpson Bay flights
Springfield to Punta Cana flights
St. Louis to Port of Spain flights
St. Louis to Santo Domingo flights
Kansas City to Gregory Town flights
Kansas City to Basseterre flights
St. Louis to St. John's flights
St. Louis to Freeport flights
Kansas City to St. John's flights
Springfield to Montego Bay flights
Springfield to Saint Thomas Island flights
Kansas City to Kingston flights
Springfield to Providenciales flights
Springfield to Oranjestad flights
St. Louis to Road Town flights
Kansas City to Puerto Plata flights
St. Louis to Gregory Town flights
Springfield to Nassau flights
Kansas City to The Valley flights
Kansas City to Road Town flights

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 March 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$140Average$262FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$172Average$311FlexibilityNo cancel feeOn-time65%
DeltaCheapest$254Average$425FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$264Average$410FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$268Average$506FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$392Average$607FlexibilityNo cancel feeOn-time63%
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.