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$108+ Cheap flights from Puerto Rico to St. Louis (STL)

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 12/6. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — STL
Nov 12 — Nov 191
Wed 11/12
Wed 11/19
1 adult, Economy
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Cheap flight deals from Puerto Rico to St. Louis

Keep the following information in mind while searching for Puerto Rico to St. Louis flight deals. Data was last updated October 13, 2025.

Round-trip from

$229
(American Airlines)

One-way from

$108
(Southwest)

Popular in

June

Cheapest in

January

Average price

$384

Good round-trip deal

$583 or less

Good one-way deal

$273 or less
From Puerto Rico to Lambert-St Louis
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One-way flight from Puerto Rico to Lambert-St Louis
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Highest demand for flights based on searches. 20% potential increase in price ($96 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Price to beat on a round-trip flight from Puerto Rico to Lambert-St Louis.
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Price to beat on a one-way flight from Puerto Rico to Lambert-St Louis.
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Find flight deals from Puerto Rico to St. Louis

Cheapest flights from Puerto Rico to St. Louis
Explore the most affordable flight options available from Puerto Rico to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 13, 2025.

This American Airlines deal was found by Cheapflights users on 10/11. 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.
Fri 11/146:25 amSJU - STL
1 stop16h 35mAmerican Airlines
Sun 11/166:00 amSTL - SJU
1 stop6h 53mAmerican Airlines
Deal found 10/11$229
This Southwest deal was found by Cheapflights users on 10/12. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/44:40 pmSJU - STL
1 stop7h 20mSouthwest
Mon 12/88:15 amSTL - SJU
1 stop11h 15mSouthwest
Deal found 10/12$269
This Frontier deal was found by Cheapflights users on 10/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/49:32 pmSJU - STL
1 stop13h 13mFrontier
Mon 12/85:11 pmSTL - SJU
1 stop7h 39mFrontier
Deal found 10/12$278
This Frontier deal was found by Cheapflights users on 10/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/23:59 amSJU - STL
1 stop7h 41mFrontier
Thu 11/62:12 pmSTL - SJU
1 stop10h 42mFrontier
Deal found 10/12$296
This Trip.com deal was found by Cheapflights users on 10/12. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/244:16 pmSJU - STL
1 stop26h 46mFrontier
Sun 10/261:41 pmSTL - SJU
1 stop11h 49mFrontier
Deal found 10/12$302
This American Airlines deal was found by Cheapflights users on 10/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/48:18 amSJU - STL
1 stop11h 45mAmerican Airlines
Sun 12/74:36 pmSTL - SJU
1 stop15h 33mAmerican Airlines
Deal found 10/12$303
This American Airlines deal was found by Cheapflights users on 10/11. 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.
Thu 12/411:00 amSJU - STL
2 stops10h 30mAmerican Airlines
Mon 12/85:15 amSTL - SJU
2 stops9h 48mAmerican Airlines
Deal found 10/11$304
This United Airlines deal was found by Cheapflights users on 10/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/32:05 amSJU - STL
1 stop10h 45mUnited Airlines
Mon 12/810:00 amSTL - SJU
1 stop9h 00mUnited Airlines
Deal found 10/12$315
This Southwest deal was found by Cheapflights users on 10/12. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/107:40 amSJU - STL
1 stop9h 30mSouthwest
Mon 11/179:40 amSTL - SJU
1 stop11h 40mSouthwest
Deal found 10/12$316

Cheapflights Fare Finder

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

Fly from

Puerto Rico

Fly to

St. Louis

Route

Depart

Return

Price

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Thu 12/4

4:40 pm-10:00 pm

1 stop7h 20m

Lambert-St Louis

Mon 12/8

8:15 am-9:30 pm

1 stop11h 15m

$269

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Thu 12/4

8:18 am-6:03 pm

1 stop11h 45m

Lambert-St Louis

Sun 12/7

4:36 pm-10:09 am

1 stop15h 33m

$303

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Thu 12/4

8:18 am-9:28 pm

1 stop15h 10m

Lambert-St Louis

Mon 12/8

5:15 am-5:03 pm

2 stops9h 48m

$303

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Wed 12/3

2:05 am-10:50 am

1 stop10h 45m

Lambert-St Louis

Mon 12/8

11:25 am-9:00 pm

1 stop7h 35m

$315

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Sun 11/2

3:59 am-1:17 pm

1 stop11h 18m

Lambert-St Louis

Thu 11/6

2:12 pm-2:54 am

1 stop10h 42m

$346

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Wed 10/22

3:40 am-12:46 pm

1 stop10h 06m

Lambert-St Louis

Mon 10/27

6:05 pm-2:09 am

1 stop7h 04m

$349

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Fri 12/12

6:10 am-5:20 pm

1 stop13h 10m

Lambert-St Louis

Mon 12/15

7:35 pm-10:25 am

1 stop12h 50m

$355

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Mon 11/3

8:20 am-11:07 pm

1 stop16h 47m

Lambert-St Louis

Thu 11/6

6:00 am-11:52 pm

1 stop15h 52m

$355

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Thu 11/20

4:44 pm-12:05 am

1 stop9h 21m

Lambert-St Louis

Mon 11/24

6:52 am-8:48 pm

1 stop11h 56m

$355

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Fri 11/14

6:00 am-2:53 pm

2 stops10h 53m

Lambert-St Louis

Sun 11/16

6:00 am-2:53 pm

1 stop6h 53m

$361

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/13

Showing 1-10 of 19 results
1
2

Best time to book a flight from Puerto Rico to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Puerto Rico 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 Puerto Rico to St. Louis

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

Currently, January is the cheapest month in which you can book a flight from Puerto Rico to St. Louis (average of $127). Flying from Puerto Rico to St. Louis in August is currently the most expensive (average of $253). 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 PR to STL?

Find hourly flight availability from Puerto Rico to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 13, 2025.

It’s optimal to fly from Puerto Rico to St. Louis at noon. By choosing this option you can save up to 52% on the cost of your flight, compared to a flight in the afternoon.

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated October 13, 2025.
See what other customers who have flown with Southwest, Delta, and United Airlines from Puerto Rico to St. Louis have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,235 reviews

Overall

8.0

Comfort

8.0

Entertainment

7.5

Food

7.0

Boarding

8.1

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
4,235 reviews
Southwest
8.0
Very good
4,235 reviews

Overall

8.0

Comfort

8.0

Entertainment

7.5

Food

7.0

Boarding

8.1

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
7,973 reviews
Southwest
8.0
Very good
4,235 reviews

Overall

8.0

Comfort

8.0

Entertainment

7.5

Food

7.0

Boarding

8.1

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
8,974 reviews
Southwest
8.0
Very good
4,235 reviews

Overall

8.0

Comfort

8.0

Entertainment

7.5

Food

7.0

Boarding

8.1

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
11,045 reviews
Southwest
8.0
Very good
4,235 reviews

Overall

8.0

Comfort

8.0

Entertainment

7.5

Food

7.0

Boarding

8.1

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
3,136 reviews
Southwest
8.0
Very good
4,235 reviews

Overall

8.0

Comfort

8.0

Entertainment

7.5

Food

7.0

Boarding

8.1

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 Puerto Rico to St. Louis. 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 into for flights to St. Louis from Puerto Rico?

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

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

    Departing from Puerto Rico to St. Louis will take you 7h 20m. There are 2024 mi between Puerto Rico and St. Louis. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    For one-way options, check prices for Southwest. According to our data, you can fly for as low as $108. Users have also found prices from $113 and $113 on Delta and United Airlines, respectively.

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

    The cheapest flight price from Puerto Rico to St. Louis is $108. On average you can expect to pay $428. The most popular route, (San Juan Luis Munoz Marin Intl - Lambert-St Louis), can usually be booked for $225.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Puerto Rico to St. Louis 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 Puerto Rico to St. Louis?

    Currently, January is the cheapest month in which you can book a flight from Puerto Rico to St. Louis (average of $127). Flying from Puerto Rico to St. Louis in August is currently the most expensive (average of $253). 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

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Edwardsville
O'Fallon
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
St. Peters
Chesterfield
Alton
Farmington
Festus

Browse thousands of different options on Cheapflights for your next trip

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Top 5 airlines flying from Puerto Rico to St. Louis

Discover the top 5 airlines that operate flights from Puerto Rico to St. Louis. 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 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$128Average$261FlexibilityNo cancel feeOn-time62%
DeltaCheapest$205Average$375FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$254Average$408FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$255Average$462FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$342Average$610FlexibilityNo cancel feeOn-time63%

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