St. Louis

$88+ 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 5/23. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — STL
maj 28 — juni 41
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Cheap 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 april 28, 2026.

This Frontier deal was found by Cheapflights users on 4/23. 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.
tor. 5/143:33 pm
SJU
-
STL
1 stop9h 48m
Frontier
man. 5/184:19 pm
STL
-
SJU
1 stop8h 49m
Frontier
Deal found 4/23$211
This eDestinos deal was found by Cheapflights users on 4/23. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
tor. 8/136:31 pm
SJU
-
STL
1 stop6h 28m
Frontier
tir. 8/254:10 pm
STL
-
SJU
1 stop8h 44m
Frontier
Deal found 4/23$234
This CheapOair deal was found by Cheapflights users on 4/23. 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.
fre. 5/88:59 am
SJU
-
STL
1 stop16h 22m
Frontier
søn. 5/104:19 pm
STL
-
SJU
1 stop14h 45m
Frontier
Deal found 4/23$246
This Priceline deal was found by Cheapflights users on 4/24. 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.
lør. 5/306:00 am
SJU
-
STL
1 stop18h 57m
Frontier
lør. 7/44:17 pm
STL
-
SJU
1 stop14h 40m
Frontier
Deal found 4/24$249
This Trip.com deal was found by Cheapflights users on 4/24. 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.
tor. 5/149:09 am
SJU
-
STL
1 stop16h 12m
Frontier
ons. 5/205:27 pm
STL
-
SJU
2 stops21h 28m
Frontier
Deal found 4/24$255
This Delta deal was found by Cheapflights users on 4/23. 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.
tor. 8/135:45 pm
SJU
-
STL
1 stop6h 52m
Delta
tir. 8/256:00 am
STL
-
SJU
1 stop6h 30m
Delta
Deal found 4/23$258
This American Airlines deal was found by Cheapflights users on 4/23. 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.
tor. 8/136:51 am
SJU
-
STL
1 stop17h 32m
American Airlines
tir. 8/257:23 am
STL
-
SJU
2 stops10h 01m
American Airlines
Deal found 4/23$264
This American Airlines deal was found by Cheapflights users on 4/23. 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.
tor. 8/137:14 pm
SJU
-
STL
1 stop16h 31m
American Airlines
ons. 8/267:23 am
STL
-
SJU
2 stops10h 01m
American Airlines
Deal found 4/23$269
This Frontier deal was found by Cheapflights users on 4/25. 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.
fre. 5/110:28 am
SJU
-
STL
1 stop13h 51m
Frontier
fre. 5/154:19 pm
STL
-
SJU
1 stop8h 49m
Frontier
Deal found 4/25$271

Find 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 april 28, 2026.

Round-trip from

$211
(Frontier)

One-way from

$88
(Frontier)

Popular in

June

Cheapest in

January

Average price

$346
From Puerto Rico to Lambert-St Louis
One-way flight from Puerto Rico to Lambert-St Louis
Highest demand for flights based on searches. 18% potential increase in price ($94 potential increase over avg. RT price).
Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
Average for round-trip flights in April 2026

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 april 28, 2026.
Use the filters below to find and compare flights from Puerto Rico to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

lør. 5/23

6:25 am-7:31 pm

1 stop14h 06m

Lambert-St Louis

lør. 5/30

4:19 pm-2:08 am

1 stop8h 49m

$334

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

tor. 8/13

8:55 pm-7:45 am

1 stop11h 50m

Lambert-St Louis

tir. 8/25

10:15 am-7:00 pm

2 stops7h 45m

$336

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

tor. 8/13

5:30 am-3:10 pm

2 stops10h 40m

Lambert-St Louis

man. 8/17

5:10 am-1:45 pm

1 stop7h 35m

$336

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

tir. 5/19

6:30 am-8:55 am

2 stops27h 25m

Lambert-St Louis

tir. 6/2

6:33 pm-11:59 pm

2 stops28h 26m

$378

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

fre. 6/19

9:50 am-7:35 pm

2 stops10h 45m

Lambert-St Louis

søn. 6/21

4:20 pm-12:25 am

1 stop7h 05m

$467

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

fre. 7/3

10:20 pm-8:40 am

1 stop11h 20m

Lambert-St Louis

man. 7/6

6:15 pm-1:20 am

1 stop6h 05m

$467
Quickest round-trip

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

tir. 7/14

7:00 am-2:45 pm

2 stops8h 45m

Lambert-St Louis

lør. 7/18

5:25 pm-12:45 am

1 stop6h 20m

$493

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

ons. 6/17

1:00 am-12:11 pm

2 stops12h 11m

Lambert-St Louis

lør. 6/20

9:23 am-8:34 pm

1 stop10h 11m

$557

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

tor. 6/25

10:20 am-8:50 pm

2 stops11h 30m

Lambert-St Louis

tor. 7/9

2:25 pm-12:05 am

2 stops8h 40m

$596

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

lør. 6/13

5:00 am-5:55 pm

2 stops13h 55m

Lambert-St Louis

lør. 7/11

9:50 am-8:35 pm

2 stops9h 45m

$613

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/23

Showing 1-10 of 18 resultsSorted by cheapest first
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

How far ahead should I book a flight from Puerto Rico to St. Louis?

The best time to book flights from Puerto Rico to St. Louis is 23 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, December is the cheapest month in which you can book a flight from Puerto Rico to St. Louis (average of $84). Flying from Puerto Rico to St. Louis in August is currently the most expensive (average of $233). 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.

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 april 28, 2026.
See what other customers who have flown with Southwest,Delta, andAmerican 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.

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

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 11h 50m. 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 Frontier. According to our data, you can fly for as low as $98. Users have also found prices from $104 and $112 on Delta and Southwest, respectively.

  • 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, December is the cheapest month in which you can book a flight from Puerto Rico to St. Louis (average of $84). Flying from Puerto Rico to St. Louis in August is currently the most expensive (average of $233). 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
Fenton
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Wentzville
Glencoe
Chesterfield
Alton
Farmington
Festus

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Puerto Rico to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.

Top 4 airlines flying from Puerto Rico to St. Louis

Discover the top 4 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 april 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$84Average$318FlexibilityNo cancel feeOn-time62%
DeltaCheapest$170Average$530FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$225Average$379FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$342Average$595FlexibilityNo cancel feeOn-time63%

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