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Luis Munoz Marin Intl

$105+ 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 5/3. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SJU
Apr 2 — Apr 91
Wed 4/2
Wed 4/9
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 August or January, booked 29 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 March 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$209
(Southwest)

One-way from

$105
(United Airlines)

Popular in

December

Cheapest in

August

Average price

$479
Provider with most accurate pricing for Lambert-St Louis-San Juan Luis Munoz Marin Intl flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-San Juan Luis Munoz Marin Intl flights.
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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. 3% potential increase in price ($17 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in March 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 March 28, 2025.

This Southwest deal was found by Cheapflights users on 3/27. 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.
Sun 4/274:35 pmSTL - SJU
1 stop6h 05mSouthwest
Thu 5/15:35 amSJU - STL
1 stop8h 55mSouthwest
Deal found 3/27$209
This Delta deal was found by Cheapflights users on 3/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/2612:47 pmSTL - SJU
1 stop6h 36mDelta
Sat 5/36:15 amSJU - STL
1 stop6h 26mDelta
Deal found 3/27$261
This Mytrip deal was found by Cheapflights users on 3/27. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/246:10 pmSTL - SJU
2 stops28h 36mSpirit Airlines
Thu 5/19:25 amSJU - STL
1 stop8h 50mSpirit Airlines
Deal found 3/27$285
This American Airlines deal was found by Cheapflights users on 3/27. 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.
Sat 5/36:15 amSTL - SJU
1 stop16h 54mAmerican Airlines
Wed 5/76:10 amSJU - STL
1 stop17h 09mAmerican Airlines
Deal found 3/27$286
This United Airlines deal was found by Cheapflights users on 3/27. 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.
Sat 4/261:12 pmSTL - SJU
1 stop9h 42mUnited Airlines
Fri 5/21:05 amSJU - STL
2 stops10h 58mUnited Airlines
Deal found 3/27$287
This CheapOair deal was found by Cheapflights users on 3/27. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/44:57 pmSTL - SJU
1 stop19h 19mFrontier
Sun 4/69:35 pmSJU - STL
1 stop27h 11mFrontier
Deal found 3/27$298
This Booking.com deal was found by Cheapflights users on 3/27. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/810:10 amSTL - SJU
1 stop7h 57mMultiple Airlines
Mon 5/129:30 pmSJU - STL
1 stop27h 36mMultiple Airlines
Deal found 3/27$310

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 March 28, 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 4/27

4:35 pm-11:40 pm

1 stop6h 05m

San Juan Luis Munoz Marin Intl

Thu 5/1

5:35 am-1:30 pm

1 stop8h 55m

$209

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 4/26

12:47 pm-8:23 pm

1 stop6h 36m

San Juan Luis Munoz Marin Intl

Sat 5/3

6:15 am-11:41 am

1 stop6h 26m

$261

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Thu 4/24

6:10 pm-11:46 pm

2 stops28h 36m

San Juan Luis Munoz Marin Intl

Thu 5/1

9:25 am-5:15 pm

1 stop8h 50m

$285

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 5/3

6:15 am-12:09 am

1 stop16h 54m

San Juan Luis Munoz Marin Intl

Wed 5/7

6:10 am-10:19 pm

1 stop17h 09m

$286

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 4/26

1:12 pm-11:54 pm

1 stop9h 42m

San Juan Luis Munoz Marin Intl

Fri 5/2

1:05 am-11:03 am

2 stops10h 58m

$287

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 5/2

5:55 pm-2:51 am

1 stop7h 56m

San Juan Luis Munoz Marin Intl

Fri 5/9

3:56 am-12:06 am

1 stop21h 10m

$298

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Thu 5/8

10:10 am-7:07 pm

1 stop7h 57m

San Juan Luis Munoz Marin Intl

Mon 5/12

9:30 pm-12:06 am

1 stop27h 36m

$310

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 5/3

9:40 am-11:57 pm

2 stops13h 17m

$105

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Tue 5/13

6:00 am-10:30 pm

1 stop15h 30m

$107

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 4/5

4:57 pm-1:50 am

1 stop7h 53m

$148

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/27

Showing 1-10 of 13 results
1
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Compare providers for flights from St. Louis to Luis Munoz Marin Intl

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 St. Louis to Luis Munoz Marin Intl in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*1 star
CheapOairPrice Accuracy1 starTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
FlightnetworkPrice Accuracy-Trust Score*3 stars
CheapTicketsDealPrice Accuracy3 starsTrust Score*3 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 St. Louis-San Juan Luis Munoz Marin Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-San Juan Luis Munoz Marin Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-San Juan Luis Munoz Marin Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-San Juan Luis Munoz Marin Intl Airport 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 St. Louis-San Juan Luis Munoz Marin Intl Airport 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 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 March 21, 2025.

Booking 29 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 December is currently the most expensive (average of $336). 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 March 28, 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 afternoon, which can drop the price by up to 52% versus a flight in the morning.

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 mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in Luis Munoz Marin Intl by month

Plan your trip to Luis Munoz Marin Intl by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in San Juan Luis Munoz Marin Intl Airport ranges from 2.2 - 6.1 inches per month. November is typically the wettest month, when rainfall can reach 6.1 in. February is typically the driest time to visit San Juan Luis Munoz Marin Intl Airport when rainfall is around 2.2 in.

Temperature in Luis Munoz Marin Intl by month

Plan your trip to Luis Munoz Marin Intl by taking into account the average temperature totals by month.

If weather is an important factor for your trip to San Juan Luis Munoz Marin Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, June is the ideal time of year to visit, when temperatures reach an average of 82.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 77.0 F).

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 March 28, 2025.
To help decide which airline to fly from St. Louis to San Juan, see what other customers have to say about Southwest, Delta and United Airlines. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,274 reviews

Entertainment

7.6

Overall

8.1

Comfort

8.1

Food

7.1

Boarding

8.2

Crew

8.7

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Southwest
8.1
Very good
4,274 reviews
Southwest
8.1
Very good
4,274 reviews

Entertainment

7.6

Overall

8.1

Comfort

8.1

Food

7.1

Boarding

8.2

Crew

8.7

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Delta
8.0
Very good
7,897 reviews
Southwest
8.1
Very good
4,274 reviews

Entertainment

7.6

Overall

8.1

Comfort

8.1

Food

7.1

Boarding

8.2

Crew

8.7

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
United Airlines
7.4
Good
8,603 reviews
Southwest
8.1
Very good
4,274 reviews

Entertainment

7.6

Overall

8.1

Comfort

8.1

Food

7.1

Boarding

8.2

Crew

8.7

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,274 reviews

Entertainment

7.6

Overall

8.1

Comfort

8.1

Food

7.1

Boarding

8.2

Crew

8.7

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Spirit Airlines
6.3
Okay
7,882 reviews
Southwest
8.1
Very good
4,274 reviews

Entertainment

7.6

Overall

8.1

Comfort

8.1

Food

7.1

Boarding

8.2

Crew

8.7

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

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 ($209), Delta ($261), and Spirit Airlines ($285) offers the cheapest pricing from St. Louis to San Juan Luis Munoz Marin Intl Airport. Southwest is 52% 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?

    $105 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on American Airlines and Frontier, with prices starting from $107 and $148, 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 North Carolina Blumenthal Performing Arts Center are the most popular attractions in Charlotte if you're in need of something to do during your layover. Carowind, Mint Museum Uptown, and North Carolina Blumenthal Performing Arts Center can be accessed by traveling approximately 8.2 mi, 5.4 mi, and 5.8 mi, respectively from Charlotte Douglas. Travelers can book a car rental at Charlotte Douglas for about $48 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 $29.

  • 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 December is currently the most expensive (average of $336). 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
Dorado
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Rio Grande
Bayamón

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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
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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 March 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$140Average$262FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$172Average$311FlexibilityNo cancel feeOn-time65%
DeltaCheapest$254Average$425FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$264Average$410FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$268Average$506FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$392Average$607FlexibilityNo cancel feeOn-time63%
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