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$108+ 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 11/8. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — STL
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from San Juan Luis Munoz Marin Intl to Lambert-St Louis are usually found in January or April, booked 65 days in advance, depart on a Tuesday or Thursday and return on a Wednesday

Cheap 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 September 11, 2025.

Round-trip from

$230
(American Airlines)

One-way from

$108
(Southwest)

Popular in

June

Cheapest in

January

Average price

$386

Good one-way deal

$198 or less
From San Juan Luis Munoz Marin Intl to Lambert-St Louis
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One-way flight from San Juan Luis Munoz Marin Intl to Lambert-St Louis
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Highest demand for flights based on searches. 18% potential increase in price ($89 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a one-way flight from San Juan Luis Munoz Marin Intl to Lambert-St Louis.
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Find 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 September 11, 2025.

This American Airlines deal was found by Cheapflights users on 9/8. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/185:30 amSJU - STL
1 stop14h 12mAmerican Airlines
Thu 10/306:25 amSTL - SJU
1 stop14h 45mAmerican Airlines
Deal found 9/8$225
This American Airlines deal was found by Cheapflights users on 9/11. 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.
Wed 10/297:05 amSJU - STL
2 stops12h 15mAmerican Airlines
Mon 11/38:13 amSTL - SJU
1 stop10h 35mAmerican Airlines
Deal found 9/11$230
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Wed 10/151:05 amSJU - STL
2 stops10h 44mUnited Airlines
Tue 10/286:15 amSTL - SJU
1 stop8h 21mUnited Airlines
Deal found 9/9$268
This Kiwi.com deal was found by Cheapflights users on 9/8. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/173:40 amSJU - STL
1 stop12h 58mFrontier
Thu 10/302:12 pmSTL - SJU
1 stop6h 12mFrontier
Deal found 9/8$286
This American Airlines deal was found by Cheapflights users on 9/9. 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 10/112:01 pmSJU - STL
2 stops11h 21mAmerican Airlines
Wed 10/810:36 amSTL - SJU
1 stop12h 23mAmerican Airlines
Deal found 9/9$294
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 9/239:26 pmSJU - STL
2 stops37h 14mMultiple Airlines
Fri 9/261:57 pmSTL - SJU
1 stop9h 02mMultiple Airlines
Deal found 9/10$321
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Tue 9/301:05 amSJU - STL
2 stops12h 23mUnited Airlines
Wed 10/86:15 amSTL - SJU
1 stop8h 27mUnited Airlines
Deal found 9/9$322

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 September 11, 2025.
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

Wed 10/29

7:05 am-6:20 pm

2 stops12h 15m

Lambert-St Louis

Mon 11/3

8:13 am-8:48 pm

1 stop10h 35m

$230

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Wed 10/15

1:05 am-10:49 am

2 stops10h 44m

Lambert-St Louis

Tue 10/28

6:15 am-3:36 pm

1 stop8h 21m

$268

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Fri 10/17

3:40 am-3:38 pm

1 stop12h 58m

Lambert-St Louis

Thu 10/30

2:12 pm-9:24 pm

1 stop6h 12m

$286

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Fri 10/24

3:34 pm-11:18 pm

1 stop8h 44m

Lambert-St Louis

Fri 10/31

10:36 am-10:10 pm

2 stops10h 34m

$294

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Thu 10/16

5:00 pm-11:56 pm

1 stop7h 56m

Lambert-St Louis

Tue 10/28

6:00 am-3:55 pm

2 stops8h 55m

$294

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Mon 10/27

3:00 pm-11:54 pm

1 stop9h 54m

Lambert-St Louis

Thu 10/30

8:30 am-10:10 pm

1 stop12h 40m

$294

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Sat 10/18

5:30 am-6:42 pm

1 stop14h 12m

Lambert-St Louis

Thu 10/30

10:36 am-10:10 pm

2 stops10h 34m

$298

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Tue 10/28

11:56 am-8:53 pm

2 stops9h 57m

Lambert-St Louis

Tue 11/11

6:00 am-5:52 pm

2 stops9h 52m

$301

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Sat 11/8

8:50 am-12:00 pm

Nonstop5h 10m

$108

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Fri 10/31

7:15 am-12:35 pm

1 stop6h 20m

$113

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 17 results
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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 August 29, 2025.

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 65 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, August is the cheapest month in which you can book a flight from San Juan Luis Munoz Marin Intl Airport to St. Louis (average of $311). Flying from San Juan Luis Munoz Marin Intl Airport to St. Louis in March is currently the most expensive (average of $356). 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 September 11, 2025.

One of the essential ways to save on airfare from San Juan Luis Munoz Marin Intl Airport to St. Louis is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the afternoon could potentially save you up to 60% on airfare.

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 September 11, 2025.
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
4,248 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

Boarding

8.1

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
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

Boarding

8.1

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
7,960 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

Boarding

8.1

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
10,000 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

Boarding

8.1

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
3,177 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

Boarding

8.1

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 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 10h 44m. American Airlines provides one of the quickest options available for as low as $268. The distance from San Juan Luis Munoz Marin Intl Airport to St. Louis is about 2024 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    Frontier, at $163, 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 58% 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?

    $108 is the cheapest one-way deal found within the past few days, from Southwest. You may also be able to find cheap deals on Delta and United Airlines, with prices starting from $113 and $113, 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 $198, our data shows the cheapest flight currently is $198. When looking at the most popular route, (San Juan Luis Munoz Marin Intl - Lambert-St Louis), you can expect to pay $241 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, August is the cheapest month in which you can book a flight from San Juan Luis Munoz Marin Intl Airport to St. Louis (average of $311). Flying from San Juan Luis Munoz Marin Intl Airport to St. Louis in March is currently the most expensive (average of $356). 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

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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.
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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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$163Average$250FlexibilityNo cancel feeOn-time62%
DeltaCheapest$205Average$375FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$254Average$416FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$279Average$609FlexibilityNo cancel feeOn-time63%

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