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$83+ Cheap flights from Luis Munoz Marin Intl (SJU) 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 2/11. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — STL
Feb 25 — Mar 41
Wed 2/25
Wed 3/4
1 adult, Economy
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Cheap flight deals from Luis Munoz Marin Intl to St. Louis

Cheapest flights from Luis Munoz Marin Intl to St. Louis
Explore the most affordable flight options available from Luis Munoz Marin Intl to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 26, 2026.

This Frontier deal was found by Cheapflights users on 1/26. 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.
Mon 4/203:19 pm
SJU
-
STL
1 stop9h 00m
Frontier
Sat 4/254:55 pm
STL
-
SJU
1 stop8h 06m
Frontier
Deal found 1/26$182
This Priceline deal was found by Cheapflights users on 1/26. 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.
Tue 2/245:25 pm
SJU
-
STL
1 stop7h 02m
Frontier
Tue 3/33:49 pm
STL
-
SJU
1 stop9h 04m
Frontier
Deal found 1/26$199
This Frontier deal was found by Cheapflights users on 1/25. 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.
Thu 2/265:25 pm
SJU
-
STL
1 stop8h 34m
Frontier
Mon 3/23:49 pm
STL
-
SJU
1 stop6h 54m
Frontier
Deal found 1/25$203
This Frontier deal was found by Cheapflights users on 1/24. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/2712:27 pm
SJU
-
STL
1 stop14h 00m
Frontier
Mon 3/23:49 pm
STL
-
SJU
1 stop9h 04m
Frontier
Deal found 1/24$217
This Priceline deal was found by Cheapflights users on 1/26. 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.
Tue 2/245:25 pm
SJU
-
STL
1 stop7h 02m
Frontier
Sat 2/283:49 pm
STL
-
SJU
1 stop9h 04m
Frontier
Deal found 1/26$224
This Kiwi.com deal was found by Cheapflights users on 1/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/276:00 am
SJU
-
STL
1 stop20h 27m
Multiple Airlines
Mon 3/28:22 pm
STL
-
SJU
2 stops20h 36m
Multiple Airlines
Deal found 1/23$234
This Kiwi.com deal was found by Cheapflights users on 1/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/2411:52 am
SJU
-
STL
2 stops20h 59m
Multiple Airlines
Tue 3/33:49 pm
STL
-
SJU
1 stop16h 05m
Multiple Airlines
Deal found 1/26$235
This Kiwi.com deal was found by Cheapflights users on 1/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/2411:52 am
SJU
-
STL
2 stops20h 59m
Multiple Airlines
Sat 2/283:49 pm
STL
-
SJU
1 stop16h 28m
Multiple Airlines
Deal found 1/26$236
This Frontier deal was found by Cheapflights users on 1/25. 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.
Thu 4/233:19 pm
SJU
-
STL
1 stop9h 00m
Frontier
Wed 5/204:55 pm
STL
-
SJU
1 stop8h 06m
Frontier
Deal found 1/25$243
This American Airlines deal was found by Cheapflights users on 1/24. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/276:33 am
SJU
-
STL
1 stop16h 39m
American Airlines
Mon 3/29:37 am
STL
-
SJU
2 stops9h 57m
American Airlines
Deal found 1/24$246
This Kiwi.com deal was found by Cheapflights users on 1/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/54:40 pm
SJU
-
STL
2 stops16h 11m
Multiple Airlines
Tue 2/103:49 pm
STL
-
SJU
1 stop15h 58m
Multiple Airlines
Deal found 1/25$249

Find flight deals from Luis Munoz Marin Intl to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Luis Munoz Marin Intl (SJU) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 26, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$182
(Frontier)

One-way from

$83
(eDestinos)

Popular in

June

Cheapest in

January

Average price

$248

Good one-way deal

$488 or less
Provider with most accurate pricing for San Juan Luis Munoz Marin Intl-Lambert-St Louis flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Juan Luis Munoz Marin Intl-Lambert-St Louis flights.
Search Deals
From San Juan Luis Munoz Marin Intl to Lambert-St Louis
Search Deals
One-way flight from San Juan Luis Munoz Marin Intl to Lambert-St Louis
Search Deals
Highest demand for flights based on searches. 21% potential increase in price ($111 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals
Price to beat on a one-way flight from San Juan Luis Munoz Marin Intl to Lambert-St Louis.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Luis Munoz Marin Intl 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 January 26, 2026.
Use the filters below to find and compare flights from San Juan Luis Munoz Marin Intl Airport to St. Louis that are best for you.

Fly from

Luis Munoz Marin Intl

Fly to

St. Louis

Route

Depart

Return

Price

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Mon 4/20

3:19 pm-11:19 pm

1 stop9h 00m

Lambert-St Louis

Sat 4/25

4:55 pm-2:01 am

1 stop8h 06m

$182

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Tue 2/24

5:25 pm-10:27 pm

1 stop7h 02m

Lambert-St Louis

Tue 3/3

3:49 pm-2:53 am

1 stop9h 04m

$199

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Thu 2/26

5:25 pm-11:59 pm

1 stop8h 34m

Lambert-St Louis

Mon 3/2

3:49 pm-2:53 am

1 stop9h 04m

$203

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Fri 2/27

12:27 pm-12:27 am

1 stop14h 00m

Lambert-St Louis

Mon 3/2

3:49 pm-2:53 am

1 stop9h 04m

$217

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Fri 2/27

6:00 am-12:27 am

1 stop20h 27m

Lambert-St Louis

Mon 3/2

8:22 pm-6:58 pm

2 stops20h 36m

$234

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Tue 2/24

11:52 am-6:51 am

2 stops20h 59m

Lambert-St Louis

Tue 3/3

3:49 pm-9:54 am

1 stop16h 05m

$235

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Thu 4/23

3:56 pm-10:56 pm

1 stop8h 00m

Lambert-St Louis

Tue 4/28

10:10 am-8:38 pm

1 stop9h 28m

$246

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Mon 2/16

3:53 am-6:51 am

2 stops28h 58m

Lambert-St Louis

Sat 2/21

3:49 pm-10:17 am

1 stop16h 28m

$246

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Tue 3/3

11:07 am-10:27 pm

1 stop13h 20m

$91

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Wed 2/11

11:07 am-10:27 pm

1 stop13h 20m

$91

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/24

Showing 1-10 of 20 results
1
2

Compare providers for flights from Luis Munoz Marin Intl to St. Louis

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Luis Munoz Marin Intl to St. Louis in January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on San Juan Luis Munoz Marin Intl Airport-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on San Juan Luis Munoz Marin Intl Airport-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from San Juan Luis Munoz Marin Intl Airport-St. Louis flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on San Juan Luis Munoz Marin Intl Airport-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for San Juan Luis Munoz Marin Intl Airport-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Luis Munoz Marin Intl to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Luis Munoz Marin Intl 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 San Juan Luis Munoz Marin Intl Airport to St. Louis

How far ahead should I book a flight from San Juan Luis Munoz Marin Intl Airport to St. Louis?

Use this chart to determine the optimal time to book a round-trip flight from Luis Munoz Marin Intl to St. Louis. Price data was last updated on January 23, 2026.

The price you pay for your flight from San Juan Luis Munoz Marin Intl Airport to St. Louis may vary depending on when you book. For the best chance of a lower fare, look to book 58 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from San Juan Luis Munoz Marin Intl Airport to St. Louis?

Currently, June is the cheapest month in which you can book a flight from San Juan Luis Munoz Marin Intl Airport to St. Louis (average of $112). Flying from San Juan Luis Munoz Marin Intl Airport to St. Louis in August is currently the most expensive (average of $264). 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 SJU to STL?

Find hourly flight availability from Luis Munoz Marin Intl 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 January 26, 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from San Juan Luis Munoz Marin Intl Airport to St. Louis as you normally would.

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 January 26, 2026.
Get a feel of what it's like to fly with Southwest, Delta, and American Airlines from San Juan Luis Munoz Marin Intl Airport to St. Louis 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
4,268 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
8.0
Very good
4,268 reviews
Southwest
8.0
Very good
4,268 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Delta
7.9
Good
8,111 reviews
Southwest
8.0
Very good
4,268 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
American Airlines
7.2
Good
11,189 reviews
Southwest
8.0
Very good
4,268 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Frontier
5.7
Fair
3,058 reviews
Southwest
8.0
Very good
4,268 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Related info for your journey

Find useful and relevant information for your journey from Luis Munoz Marin Intl 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 San Juan Luis Munoz Marin Intl?

    If you book a flight to St. Louis from San Juan Luis Munoz Marin Intl, you will be flying to Lambert-St Louis, which is the city’s only airport. Lambert-St Louis (STL) is located 12.7 mi from the center of St. Louis. There are 0 flights from San Juan Luis Munoz Marin Intl to Lambert-St Louis per day from 4 different airlines.

  • How long is the flight from San Juan Luis Munoz Marin Intl Airport to St. Louis?

    A quick flight from San Juan Luis Munoz Marin Intl Airport to St. Louis can take about 9h. Frontier provides one of the quickest options available for as low as $182. The distance from San Juan Luis Munoz Marin Intl Airport to St. Louis is about 2024 mi.

  • What are the cheapest airlines flying from San Juan Luis Munoz Marin Intl Airport to St. Louis round-trip?

    Frontier, at $84, was found to be the cheapest airline from San Juan Luis Munoz Marin Intl Airport to St. Louis.Alternate airlines to your destination round-trip include Delta and American Airlines. These flights start at 79% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from San Juan Luis Munoz Marin Intl Airport to St. Louis one-way?

    $85 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Delta and Southwest, with prices starting from $104 and $110, respectively.

  • What are the cheapest flights from San Juan Luis Munoz Marin Intl Airport to St. Louis?

    While on average a flight from San Juan Luis Munoz Marin Intl Airport to St. Louis is generally $663, our data shows the cheapest flight currently is $423. When looking at the most popular route, (San Juan Luis Munoz Marin Intl - Lambert-St Louis), you can expect to pay $218 for that flight.

  • Can I find deals for flights from Luis Munoz Marin Intl to St. Louis that include hotel bookings?

    Yes. In addition to deals on Luis Munoz Marin Intl to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Luis Munoz Marin Intl to St. Louis?

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

  • Can I find deals for business class flights from Luis Munoz Marin Intl to St. Louis?

    Yes. Cheapflights offers flight deals from Luis Munoz Marin Intl 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 San Juan Luis Munoz Marin Intl Airport to St. Louis?

    Currently, June is the cheapest month in which you can book a flight from San Juan Luis Munoz Marin Intl Airport to St. Louis (average of $112). Flying from San Juan Luis Munoz Marin Intl Airport to St. Louis in August is currently the most expensive (average of $264). 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
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
Chesterfield
Alton
Farmington
Festus

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Alternative routes for Luis Munoz Marin Intl to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
Luis Munoz Marin Intl to Kansas City flights

Top 4 airlines flying from Luis Munoz Marin Intl to St. Louis

Discover the top 4 airlines that operate flights from Luis Munoz Marin Intl 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 January 26, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$84Average$286FlexibilityNo cancel feeOn-time62%
DeltaCheapest$170Average$375FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$225Average$424FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$342Average$610FlexibilityNo cancel feeOn-time63%

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