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Luis Munoz Marin Intl

$110+ Cheap flights from St. Louis (STL) to Luis Munoz Marin Intl (SJU)

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 8/16. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SJU
Jul 5 — Jul 121
Sat 7/5
Sat 7/12
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to San Juan Luis Munoz Marin Intl are usually found in September or August, booked 71 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

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

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Luis Munoz Marin Intl (SJU). 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 June 30, 2025.

Round-trip from

$219
(Southwest)

One-way from

$110
(Delta)

Popular in

July

Cheapest in

September

Average price

$527
From Lambert-St Louis to San Juan Luis Munoz Marin Intl
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One-way flight from Lambert-St Louis to San Juan Luis Munoz Marin Intl
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Highest demand for flights based on searches. 6% potential increase in price ($33 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Find flight deals from St. Louis to Luis Munoz Marin Intl

Cheapest flights from St. Louis to Luis Munoz Marin Intl
Explore the most affordable flight options available from St. Louis to Luis Munoz Marin Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 30, 2025.

This American Airlines deal was found by Cheapflights users on 6/30. 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 10/48:50 amSTL - SJU
2 stops13h 47mAmerican Airlines
Tue 10/77:00 amSJU - STL
2 stops12h 36mAmerican Airlines
Deal found 6/30$219
This United Airlines deal was found by Cheapflights users on 6/30. 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.
Sat 11/110:30 amSTL - SJU
2 stops9h 52mUnited Airlines
Sat 11/84:52 pmSJU - STL
1 stop7h 55mUnited Airlines
Deal found 6/30$245
This Priceline deal was found by Cheapflights users on 6/27. 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.
Mon 7/145:40 pmSTL - SJU
1 stop7h 59mMultiple Airlines
Thu 7/171:37 amSJU - STL
1 stop9h 15mMultiple Airlines
Deal found 6/27$246
This FlightHub deal was found by Cheapflights users on 6/27. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/1810:47 amSTL - SJU
1 stop23h 45mSpirit Airlines
Thu 7/241:37 amSJU - STL
1 stop9h 15mSpirit Airlines
Deal found 6/27$253
This Priceline deal was found by Cheapflights users on 6/27. 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.
Wed 7/95:40 pmSTL - SJU
1 stop25h 49mFrontier
Sat 7/129:30 pmSJU - STL
1 stop27h 17mFrontier
Deal found 6/27$268
This Southwest deal was found by Cheapflights users on 6/30. 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 7/248:40 pmSTL - SJU
1 stop12h 45mSouthwest
Sun 7/276:30 pmSJU - STL
1 stop6h 55mSouthwest
Deal found 6/30$315

Cheapflights Fare Finder

Customize your flight search to find flights from St. Louis to Luis Munoz Marin Intl 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 June 30, 2025.
Use the filters below to find and compare flights from St. Louis to San Juan Luis Munoz Marin Intl Airport that are best for you.

Fly from

St. Louis

Fly to

Luis Munoz Marin Intl

Route

Depart

Return

Price

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sun 9/28

8:10 am-4:10 pm

1 stop7h 00m

San Juan Luis Munoz Marin Intl

Sun 10/5

1:00 pm-6:25 pm

1 stop6h 25m

$219

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Mon 7/14

5:40 pm-2:39 am

1 stop7h 59m

San Juan Luis Munoz Marin Intl

Thu 7/17

1:37 am-9:52 am

1 stop9h 15m

$246

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 7/18

10:47 am-11:32 am

1 stop23h 45m

San Juan Luis Munoz Marin Intl

Thu 7/24

1:37 am-9:52 am

1 stop9h 15m

$253

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 7/9

5:40 pm-8:29 pm

1 stop25h 49m

San Juan Luis Munoz Marin Intl

Sat 7/12

9:30 pm-11:47 pm

1 stop27h 17m

$268

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sun 9/21

8:50 am-11:37 pm

2 stops13h 47m

San Juan Luis Munoz Marin Intl

Sat 9/27

4:45 pm-11:07 pm

1 stop7h 22m

$295

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 8/16

6:00 am-1:30 pm

1 stop6h 30m

$110

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Tue 9/9

6:00 pm-2:53 pm

2 stops19h 53m

$116

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sun 9/21

2:30 pm-11:34 am

2 stops20h 04m

$120

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 8/22

3:16 pm-2:50 am

1 stop10h 34m

$134

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 9/27

9:20 am-11:57 pm

2 stops13h 37m

$137

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/30

Showing 1-10 of 11 results
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Best time to book a flight from St. Louis to Luis Munoz Marin Intl

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

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

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Luis Munoz Marin Intl. Price data was last updated on June 27, 2025.

Booking 71 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis to San Juan Luis Munoz Marin Intl Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, September is the cheapest month in which you can book a flight from St. Louis to San Juan Luis Munoz Marin Intl Airport (average of $254). Flying from St. Louis to San Juan Luis Munoz Marin Intl Airport in June is currently the most expensive (average of $339). 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 STL to SJU?

Find hourly flight availability from St. Louis to Luis Munoz Marin Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 30, 2025.

When flying from St. Louis to San Juan Luis Munoz Marin Intl Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 53% versus a flight at noon.

What is the cheapest day to fly from St. Louis to San Juan Luis Munoz Marin Intl Airport?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Luis Munoz Marin Intl. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their St. Louis to San Juan Luis Munoz Marin Intl Airport flight should consider departing on Tuesday evenings when fares are most often at their lowest. Saturday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost to fly round-trip from St. Louis to San Juan Luis Munoz Marin Intl Airport?

Reviews of airlines servicing Luis Munoz Marin Intl

Get insights into the airlines that provide service to Luis Munoz Marin Intl. 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 Luis Munoz Marin Intl. Reviews last updated June 30, 2025.
Read through reviews of airlines operating flights from St. Louis to San Juan Luis Munoz Marin Intl Airport, such as Southwest, Delta, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,278 reviews

Food

7.0

Overall

8.0

Comfort

8.0

Entertainment

7.6

Crew

8.6

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Southwest
8.0
Very good
4,278 reviews
Southwest
8.0
Very good
4,278 reviews

Food

7.0

Overall

8.0

Comfort

8.0

Entertainment

7.6

Crew

8.6

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Delta
8.0
Very good
7,973 reviews
Southwest
8.0
Very good
4,278 reviews

Food

7.0

Overall

8.0

Comfort

8.0

Entertainment

7.6

Crew

8.6

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
United Airlines
7.4
Good
8,852 reviews
Southwest
8.0
Very good
4,278 reviews

Food

7.0

Overall

8.0

Comfort

8.0

Entertainment

7.6

Crew

8.6

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,278 reviews

Food

7.0

Overall

8.0

Comfort

8.0

Entertainment

7.6

Crew

8.6

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Spirit Airlines
6.3
Okay
8,094 reviews
Southwest
8.0
Very good
4,278 reviews

Food

7.0

Overall

8.0

Comfort

8.0

Entertainment

7.6

Crew

8.6

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Luis Munoz Marin Intl. 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 from for flights from St. Louis to San Juan Luis Munoz Marin Intl?

    Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to San Juan Luis Munoz Marin Intl. On average, Lambert-St Louis has 0 outbound flights to San Juan Luis Munoz Marin Intl per day from 6 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

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

    According to our current data, Southwest ($219), Spirit Airlines ($253), and Frontier ($268) offers the cheapest pricing from St. Louis to San Juan Luis Munoz Marin Intl Airport. Southwest is 50% cheaper than the average price of flights available within the next 90 days to this destination.

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

    $110 is the cheapest one-way deal found within the past few days, from Delta. You may also be able to find cheap deals on American Airlines and Spirit Airlines, with prices starting from $116 and $120, respectively.

  • Where are the most common layover locations when flying from St. Louis to San Juan Luis Munoz Marin Intl Airport?

    Most of the time, St. Louis to San Juan Luis Munoz Marin Intl Airport flights that have layovers will stop in Charlotte. Orlando sees the second most layovers for non-direct flights flying from St. Louis to San Juan Luis Munoz Marin Intl Airport.

  • What are some popular things to do or see while on a layover in Charlotte?

    Carowind, Mint Museum Uptown, and NASCAR Hall of Fame are the most popular attractions in Charlotte if you're in need of something to do during your layover. Carowind, Mint Museum Uptown, and NASCAR Hall of Fame can be accessed by traveling approximately 8.2 mi, 5.4 mi, and 5.7 mi, respectively from Charlotte Douglas. Travelers can book a car rental at Charlotte Douglas for about $44 per day to make their sightseeing more efficient.

  • What are some popular points of interest to see during a layover in Orlando?

    Walt Disney World Resort, Universal Orlando Resort, and International Drive are currently the most popular points of interest in Orlando at the moment. Walt Disney World Resort, Universal Orlando Resort, and International Drive can be accessed by traveling approximately 16.2 mi, 10.2 mi, and 9.9 mi, respectively from Orlando. Those on a layover in Orlando in need of a rental car can book one at Orlando for about $27.

  • Where are the least popular layover locations for St. Louis to San Juan Luis Munoz Marin Intl Airport flights?

    Of the flights from St. Louis to San Juan Luis Munoz Marin Intl Airport that have layovers, the fewest flights stop in Atlanta.

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

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

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

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

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

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

    Currently, September is the cheapest month in which you can book a flight from St. Louis to San Juan Luis Munoz Marin Intl Airport (average of $254). Flying from St. Louis to San Juan Luis Munoz Marin Intl Airport in June is currently the most expensive (average of $339). 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?

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Alternative routes for St. Louis to Luis Munoz Marin Intl

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

Top 6 airlines flying from St. Louis to Luis Munoz Marin Intl

Discover the top 6 airlines that operate flights from St. Louis to Luis Munoz Marin Intl. 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 June 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$140Average$253FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$155Average$319FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$219Average$387FlexibilityNo cancel feeOn-time69%
DeltaCheapest$244Average$393FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$255Average$502FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$358Average$597FlexibilityNo cancel feeOn-time63%

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