HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Puerto Rico

$113+ 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 1/25. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SJU
Nov 9 — Nov 161
Sun 11/9
Sun 11/16
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 October 10, 2025.

Round-trip from

$225
(United Airlines)

One-way from

$113
(Delta)

Popular in

December

Cheapest in

September

Average price

$481
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. 11% potential increase in price ($57 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 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 October 10, 2025.

This United Airlines deal was found by Cheapflights users on 10/8. 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.
Mon 12/810:00 amSTL - SJU
1 stop9h 00mUnited Airlines
Mon 12/152:05 amSJU - STL
1 stop10h 45mUnited Airlines
Deal found 10/8$225
This Frontier deal was found by Cheapflights users on 10/8. 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.
Sat 10/254:33 pmSTL - SJU
1 stop8h 57mFrontier
Sat 11/13:04 amSJU - STL
1 stop12h 13mFrontier
Deal found 10/8$278
This Frontier deal was found by Cheapflights users on 10/8. 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.
Fri 10/312:12 pmSTL - SJU
1 stop10h 42mFrontier
Sun 11/910:39 pmSJU - STL
1 stop13h 01mFrontier
Deal found 10/8$281
This Frontier deal was found by Cheapflights users on 10/8. 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.
Fri 11/72:12 pmSTL - SJU
1 stop10h 42mFrontier
Sun 11/910:39 pmSJU - STL
1 stop13h 01mFrontier
Deal found 10/8$284
This United Airlines deal was found by Cheapflights users on 10/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/811:20 amSTL - SJU
1 stop8h 06mUnited Airlines
Fri 11/142:05 amSJU - STL
1 stop10h 58mUnited Airlines
Deal found 10/9$289
This Mytrip deal was found by Cheapflights users on 10/8. 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 12/55:11 pmSTL - SJU
1 stop14h 44mFrontier
Sun 12/149:32 pmSJU - STL
1 stop13h 13mFrontier
Deal found 10/8$290
This Mytrip deal was found by Cheapflights users on 10/8. 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.
Sat 12/65:11 pmSTL - SJU
1 stop14h 44mFrontier
Sun 12/149:32 pmSJU - STL
1 stop13h 13mFrontier
Deal found 10/8$293
This Booking.com deal was found by Cheapflights users on 10/8. 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 10/231:41 pmSTL - SJU
1 stop11h 49mFrontier
Fri 10/3110:39 pmSJU - STL
1 stop17h 59mFrontier
Deal found 10/8$294
This Frontier deal was found by Cheapflights users on 10/9. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/84:33 pmSTL - SJU
1 stop8h 21mFrontier
Sun 11/1610:39 pmSJU - STL
1 stop13h 01mFrontier
Deal found 10/9$296
This American Airlines deal was found by Cheapflights users on 10/9. 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.
Wed 12/106:00 amSTL - SJU
2 stops9h 52mAmerican Airlines
Wed 12/178:20 amSJU - STL
2 stops10h 39mAmerican Airlines
Deal found 10/9$298
This American Airlines deal was found by Cheapflights users on 10/7. 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 11/145:56 pmSTL - SJU
1 stop17h 09mAmerican Airlines
Mon 11/178:20 amSJU - STL
1 stop16h 47mAmerican Airlines
Deal found 10/7$304
This Frontier deal was found by Cheapflights users on 10/8. 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.
Thu 11/62:12 pmSTL - SJU
1 stop10h 42mFrontier
Sun 11/93:59 amSJU - STL
1 stop7h 41mFrontier
Deal found 10/8$314

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 October 10, 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

Mon 2/16

8:20 pm-10:30 am

1 stop12h 10m

San Juan Luis Munoz Marin Intl

Thu 2/19

5:35 am-2:20 pm

2 stops10h 45m

$313

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 2/21

7:50 am-6:45 pm

2 stops8h 55m

San Juan Luis Munoz Marin Intl

Sat 2/28

6:05 am-3:15 pm

2 stops11h 10m

$389

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 12/10

11:10 am-9:26 pm

1 stop8h 16m

San Juan Luis Munoz Marin Intl

Tue 12/16

2:05 am-2:25 pm

2 stops14h 20m

$406

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 11/8

11:20 am-9:26 pm

1 stop8h 06m

San Juan Luis Munoz Marin Intl

Tue 11/11

2:05 am-3:49 pm

2 stops15h 44m

$406

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sun 1/18

9:57 am-9:00 pm

1 stop9h 03m

San Juan Luis Munoz Marin Intl

Thu 1/22

2:05 am-10:41 am

1 stop10h 36m

$406

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 2/21

6:00 am-4:36 pm

1 stop8h 36m

San Juan Luis Munoz Marin Intl

Fri 2/27

2:05 am-12:21 pm

2 stops12h 16m

$407

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sun 12/14

6:00 am-11:52 pm

1 stop15h 52m

San Juan Luis Munoz Marin Intl

Sun 12/21

6:00 am-4:46 pm

1 stop12h 46m

$428

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Tue 2/10

11:20 am-12:36 am

2 stops11h 16m

San Juan Luis Munoz Marin Intl

Wed 2/18

5:50 pm-9:00 pm

2 stops29h 10m

$441

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 11/8

6:05 am-6:40 pm

1 stop10h 35m

San Juan Luis Munoz Marin Intl

Sat 11/15

8:50 am-12:00 pm

Nonstop5h 10m

$457

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sun 1/25

10:00 am-8:30 pm

1 stop8h 30m

$113

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/8

Showing 1-10 of 19 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, May is the cheapest month in which you can book a flight from St. Louis to Puerto Rico (average of $140). Flying from St. Louis to Puerto Rico in December is currently the most expensive (average of $258). 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 October 10, 2025.

It’s optimal to fly from St. Louis to Puerto Rico in the evening. By choosing this option you can save up to 58% on the cost of your flight, compared to a flight in the afternoon.

What is the cheapest day to fly from St. Louis to Puerto Rico?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Puerto Rico. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their St. Louis to Puerto Rico flight should consider departing on Tuesday mornings when fares are most often at their lowest. Saturday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 October 10, 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
4,237 reviews

Entertainment

7.5

Overall

8.0

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,237 reviews
Southwest
8.0
Very good
4,237 reviews

Entertainment

7.5

Overall

8.0

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
8.0
Very good
7,969 reviews
Southwest
8.0
Very good
4,237 reviews

Entertainment

7.5

Overall

8.0

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,968 reviews
Southwest
8.0
Very good
4,237 reviews

Entertainment

7.5

Overall

8.0

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
11,043 reviews
Southwest
8.0
Very good
4,237 reviews

Entertainment

7.5

Overall

8.0

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,143 reviews
Southwest
8.0
Very good
4,237 reviews

Entertainment

7.5

Overall

8.0

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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.

  • How long is the flight from St. Louis to Puerto Rico?

    There are many flights that can get you from St. Louis to Puerto Rico in 8h 16m. Fly via Southwest or United Airlines to get the fastest option. The distance between St. Louis and Puerto Rico is about 2024 mi. This flight may include one or multiple stops.

  • 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, May is the cheapest month in which you can book a flight from St. Louis to Puerto Rico (average of $140). Flying from St. Louis to Puerto Rico in December is currently the most expensive (average of $258). 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.
Kansas City to Luis Munoz Marin Intl flights
St. Louis to Luis Munoz Marin Intl flights
St. Louis to Oranjestad flights
Kansas City to Punta Cana flights
St. Louis to Saint Thomas Island flights
Kansas City to Saint Thomas Island flights
St. Louis to Punta Cana flights
Kansas City to Montego Bay flights
St. Louis to Nassau flights
Kansas City to George Town flights
St. Louis to Montego Bay flights
Kansas City to Oranjestad flights
St. Louis to Simpson Bay flights
St. Louis to Georgetown flights
Springfield to Luis Munoz Marin Intl flights
Kansas City to Nassau flights
Kansas City to Santo Domingo flights
Kansas City to Simpson Bay flights
Kansas City to Castries flights
St. Louis to Willemstad flights
St. Louis to Santo Domingo flights
St. Louis to Castries flights
Kansas City to Providenciales flights
Kansas City to Gregory Town flights
Kansas City to Willemstad flights
St. Louis to Christiansted flights
Springfield to Montego Bay flights
St. Louis to Providenciales flights
Springfield to Oranjestad flights
Kansas City to Christiansted flights
Kansas City to Bridgetown flights
Kansas City to Aguadilla flights
St. Louis to St. John's flights
St. Louis to Kingston flights
St. Louis to Gregory Town flights
St. Louis to George Town flights
Springfield to Nassau flights
Kansas City to Puerto Plata flights
Kansas City to Santiago de los Caballeros flights
Kansas City to Kingston flights
St. Louis to Kralendijk flights
Kansas City to St. John's flights
Kansas City to Road Town flights
Springfield to Punta Cana flights
Kansas City to Basseterre flights
St. Louis to Puerto Plata flights
Springfield to Saint Thomas Island flights
St. Louis to Bridgetown flights
Kansas City to Marsh Harbour flights
St. Louis to Freeport 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 October 10, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$140Average$280FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$170Average$329FlexibilityNo cancel feeOn-time65%
DeltaCheapest$208Average$378FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$219Average$381FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$219Average$593FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$255Average$525FlexibilityNo cancel feeOn-time71%

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.