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$103+ 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 10/7. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — STL
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
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 July 29, 2025.

Round-trip from

$205
(American Airlines)

One-way from

$103
(Southwest)

Popular in

July

Cheapest in

January

Average price

$530
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. 14% potential increase in price ($70 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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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 July 29, 2025.

This American Airlines deal was found by Cheapflights users on 7/27. 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 9/113:50 pmSJU - STL
1 stop9h 03mAmerican Airlines
Wed 9/175:28 amSTL - SJU
1 stop8h 25mAmerican Airlines
Deal found 7/27$205
This SmartFares deal was found by Cheapflights users on 7/27. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/173:19 pmSJU - STL
2 stops19h 21mSpirit Airlines
Sun 9/2110:35 amSTL - SJU
1 stop23h 29mSpirit Airlines
Deal found 7/27$243
This Delta deal was found by Cheapflights users on 7/28. 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.
Fri 9/265:41 pmSJU - STL
1 stop6h 43mDelta
Fri 10/31:26 pmSTL - SJU
1 stop7h 34mDelta
Deal found 7/28$245
This Priceline deal was found by Cheapflights users on 7/27. 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.
Sat 8/169:30 pmSJU - STL
1 stop27h 17mFrontier
Fri 8/223:16 pmSTL - SJU
1 stop27h 02mFrontier
Deal found 7/27$254
This United Airlines deal was found by Cheapflights users on 7/27. 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 9/101:05 amSJU - STL
2 stops14h 14mUnited Airlines
Wed 9/176:15 amSTL - SJU
1 stop8h 27mUnited Airlines
Deal found 7/27$255
This CheapOair deal was found by Cheapflights users on 7/28. 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.
Tue 8/52:40 amSJU - STL
1 stop8h 49mMultiple Airlines
Mon 8/115:40 pmSTL - SJU
1 stop7h 59mMultiple Airlines
Deal found 7/28$277
This Southwest deal was found by Cheapflights users on 7/27. 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.
Wed 10/226:10 amSJU - STL
2 stops14h 50mSouthwest
Sun 10/261:50 pmSTL - SJU
1 stop5h 50mSouthwest
Deal found 7/27$300

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 July 29, 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

Thu 9/11

3:50 pm-11:53 pm

1 stop9h 03m

Lambert-St Louis

Wed 9/17

5:28 am-2:53 pm

1 stop8h 25m

$205

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Wed 9/17

3:19 pm-9:40 am

2 stops19h 21m

Lambert-St Louis

Sun 9/21

10:35 am-11:04 am

1 stop23h 29m

$243

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Fri 9/26

5:41 pm-11:24 pm

1 stop6h 43m

Lambert-St Louis

Fri 10/3

1:26 pm-10:00 pm

1 stop7h 34m

$245

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Sat 8/16

9:30 pm-11:47 pm

1 stop27h 17m

Lambert-St Louis

Fri 8/22

3:16 pm-7:18 pm

1 stop27h 02m

$254

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Wed 9/10

1:05 am-2:19 pm

2 stops14h 14m

Lambert-St Louis

Wed 9/17

6:15 am-3:42 pm

1 stop8h 27m

$255

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Wed 10/22

6:10 am-8:00 pm

2 stops14h 50m

Lambert-St Louis

Sun 10/26

1:50 pm-8:40 pm

1 stop5h 50m

$300

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Sat 8/16

9:30 pm-11:47 pm

1 stop27h 17m

Lambert-St Louis

Fri 8/22

2:30 pm-11:57 pm

2 stops8h 27m

$352

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Tue 10/7

6:10 am-8:00 pm

2 stops14h 50m

$103

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Wed 9/3

1:59 am-10:50 am

2 stops9h 51m

$105

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Sat 10/4

3:55 pm-8:05 am

2 stops17h 10m

$109

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 13 results
1
2

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 July 25, 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 July 29, 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 July 29, 2025.
Get a feel of what it's like to fly with Southwest, Delta, and United 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
4,238 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Southwest
8.0
Very good
4,238 reviews
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Delta
8.0
Very good
7,977 reviews
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
United Airlines
7.4
Good
8,899 reviews
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Spirit Airlines
6.3
Okay
8,040 reviews
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

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.

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

    American Airlines, at $205, 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 Spirit Airlines and Delta. These flights start at 49% 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?

    $103 is the cheapest one-way deal found within the past few days, from Southwest. You may also be able to find cheap deals on Spirit Airlines and American Airlines, with prices starting from $105 and $109, respectively.

  • 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
O'Fallon
Maryland Heights
Fairview Heights
Collinsville
Eureka
St. Peters
Glencoe
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Festus
Farmington

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Alternative routes for Luis Munoz Marin Intl to St. Louis

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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 July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$163Average$250FlexibilityNo cancel feeOn-time62%
DeltaCheapest$244Average$371FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$254Average$414FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$279Average$580FlexibilityNo cancel feeOn-time63%

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