Which airline has the best punctuality record on St. Louis to San Juan flights?

Over the last year, Southwest have had the lowest number of delays on this route, with just 17% of flights being delayed.

What is the most punctual flight time for St. Louis to San Juan flights?

Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.

How often are flights from St. Louis to San Juan delayed?

About 19% of weekly flights between St. Louis and San Juan have experienced delays in the past year, with the average delay time being 86 minutes.

What day of the week experiences the fewest flight delays on this route?

Saturday tends to have the lowest number of delays on this route, whereas Monday has historically faced a higher average of delays compared to other days of the week.

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

Airlines like Frontier, Southwest, and United Airlines fly from St. Louis to San Juan Luis Munoz Marin Intl Airport in about 7h 12m. The time it takes to get you to your destination can typically vary by up to 1h 38m. St. Louis and San Juan Luis Munoz Marin Intl Airport are separated by a distance of 2024 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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.

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).

What are the most popular airlines that fly from St. Louis to San Juan Luis Munoz Marin Intl Airport?

Consider American Airlines, Delta or Southwest when booking your flight. These represent the most popular airlines when flying from St. Louis to San Juan Luis Munoz Marin Intl Airport.

Most accurate provider : When it comes to deals on St. Louis-San Juan Luis Munoz Marin Intl Airport flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on St. Louis-San Juan Luis Munoz Marin Intl Airport flight deals on Cheapflights vs. CheapOair >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 CheapOair the most. CheapOair 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.

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.

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.

$113+ Cheap Flights from St. Louis to San Juan Luis Munoz Marin Intl Airport

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

Airfare is below average for this route at the moment. St. Louis to San Juan Luis Munoz Marin Intl Airport flights typically cost between $359 and $631 in November. The cheapest round-trip price found within the last 3 days was $225 on American Airlines (Nov 18-Nov 21).

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Find cheap flights from St. Louis to Luis Munoz Marin Intl with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Lambert-St Louis to San Juan Luis Munoz Marin Intl are usually found in September or April, booked 75 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

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 October 27, 2025.

Tue 11/185:15 amSTL - SJU

1 stop8h 32mAmerican Airlines

Fri 11/216:00 amSJU - STL

1 stop6h 37mAmerican Airlines

Deal found 10/27

$225

Sat 11/84:33 pmSTL - SJU

1 stop8h 21mFrontier

Thu 11/133:59 amSJU - STL

1 stop14h 21mFrontier

Deal found 10/25

$296

Tue 12/98:13 amSTL - SJU

1 stop6h 50mAmerican Airlines

Fri 12/125:56 pmSJU - STL

1 stop16h 28mAmerican Airlines

Deal found 10/25

$298

Sat 11/154:33 pmSTL - SJU

1 stop8h 21mFrontier

Sun 11/239:30 pmSJU - STL

2 stops22h 49mFrontier

Deal found 10/27

$300

Thu 11/203:14 pmSTL - SJU

1 stop7h 52mFrontier

Mon 11/2410:22 pmSJU - STL

1 stop27h 35mFrontier

Deal found 10/26

$301

Thu 12/42:47 pmSTL - SJU

1 stop19h 45mMultiple Airlines

Sat 12/137:10 amSJU - STL

2 stops28h 37mMultiple Airlines

Deal found 10/26

$322

Sat 11/18:40 pmSTL - SJU

2 stops17h 02mFrontier

Fri 11/73:59 amSJU - STL

1 stop13h 39mFrontier

Deal found 10/25

$326

Tue 12/3010:48 amSTL - SJU

1 stop12h 46mFrontier

Fri 1/93:55 amSJU - STL

1 stop20h 38mFrontier

Deal found 10/25

$328

Best flights from St. Louis to Luis Munoz Marin Intl
Discover carefully curated flight deals from St. Louis to Luis Munoz Marin Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 27, 2025.

Thu 11/203:14 pmSTL - SJU

1 stop7h 52mFrontier

Mon 11/2410:22 pmSJU - STL

1 stop27h 35mFrontier

Deal found 10/26

$301

Wed 1/148:15 amSTL - SJU

2 stops8h 50mSouthwest

Wed 1/215:40 amSJU - STL

2 stops9h 05mSouthwest

Deal found 10/24

$344

Fri 11/141:10 pmSTL - SJU

1 stop7h 12mUnited Airlines

Tue 11/182:05 amSJU - STL

1 stop10h 35mUnited Airlines

Deal found 10/25

$355

Thu 12/46:00 amSTL - SJU

1 stop15h 52mAmerican Airlines

Sat 12/136:25 amSJU - STL

1 stop16h 13mAmerican Airlines

Deal found 10/25

$400

Fri 11/285:45 pmSTL - SJU

2 stops14h 40mSouthwest

Tue 12/99:40 amSJU - STL

1 stop11h 50mSouthwest

Deal found 10/26

$365

Thu 11/273:14 pmSTL - SJU

2 stops16h 26mFrontier

Fri 12/55:09 pmSJU - STL

1 stop7h 24mFrontier

Deal found 10/25

$391

Thu 12/42:00 pmSTL - SJU

1 stop6h 05mSouthwest

Sat 12/136:15 amSJU - STL

1 stop12h 40mSouthwest

Deal found 10/26

$385

Mon 12/15:40 amSTL - SJU

2 stops9h 40mSouthwest

Sat 12/136:15 amSJU - STL

1 stop12h 40mSouthwest

Deal found 10/25

$385

Tue 12/22:00 pmSTL - SJU

1 stop8h 35mSouthwest

Sat 12/138:50 amSJU - STL

Nonstop5h 10mSouthwest

Deal found 10/25

$400

Last-minute flights from St. Louis to Luis Munoz Marin Intl
Discover last-minute flight deals from St. Louis to Luis Munoz Marin Intl. Data last updated October 27, 2025 and is based on user searches.

Sat 11/18:40 pmSTL - SJU

2 stops17h 02mFrontier

Fri 11/73:59 amSJU - STL

1 stop13h 39mFrontier

Deal found 10/25

$326

Sat 11/84:33 pmSTL - SJU

1 stop8h 21mFrontier

Thu 11/133:59 amSJU - STL

1 stop14h 21mFrontier

Deal found 10/25

$296

Fri 11/142:42 pmSTL - SJU

2 stops22h 37mFrontier

Wed 11/191:26 pmSJU - STL

2 stops11h 35mFrontier

Deal found 10/25

$334

Sat 11/154:33 pmSTL - SJU

1 stop8h 21mFrontier

Sun 11/239:30 pmSJU - STL

2 stops22h 49mFrontier

Deal found 10/27

$300

Tue 11/185:15 amSTL - SJU

1 stop8h 32mAmerican Airlines

Fri 11/216:00 amSJU - STL

1 stop6h 37mAmerican Airlines

Deal found 10/27

$225

Thu 11/203:14 pmSTL - SJU

1 stop7h 52mFrontier

Mon 11/2410:22 pmSJU - STL

1 stop27h 35mFrontier

Deal found 10/26

$301

One-way flights from St. Louis to Luis Munoz Marin Intl
Search for one-way flight options from St. Louis to Luis Munoz Marin Intl. Find affordable one-way fares based on user searches. Data last updated October 27, 2025.

Wed 1/2110:07 amSTL - SJU

1 stop9h 19mUnited Airlines

Deal found 10/27

$113

Tue 1/611:51 amSTL - SJU

1 stop9h 58mMultiple Airlines

Deal found 10/26

$115

Tue 12/3010:48 amSTL - SJU

2 stops36h 18mFrontier

Deal found 10/27

$132

Sat 1/105:11 pmSTL - SJU

2 stops28h 38mMultiple Airlines

Deal found 10/25

$133

Sun 1/188:45 amSTL - SJU

1 stop9h 39mFrontier

Deal found 10/25

$135

Sat 1/243:11 pmSTL - SJU

2 stops13h 00mUnited Airlines

Deal found 10/27

$136

Sat 1/245:11 pmSTL - SJU

1 stop14h 44mFrontier

Deal found 10/25

$141

Sat 12/63:30 pmSTL - SJU

1 stop9h 20mFrontier

Deal found 10/26

$143

Sun 1/410:57 amSTL - SJU

2 stops36h 09mFrontier

Deal found 10/26

$148

Mon 11/245:17 amSTL - SJU

2 stops17h 27mAmerican Airlines

Deal found 10/25

$149

Fri 1/910:42 amSTL - SJU

1 stop26h 19mFrontier

Deal found 10/26

$151

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

Most accurate provider	CheapOair 3 stars
Most trusted provider	CheapOair 3 stars
Round-trip from	$225 (American Airlines)
One-way from	$113 (United Airlines)
Popular in	December
Cheapest in	September
Average price	$485

Provider with most accurate pricing for Lambert-St Louis-San Juan Luis Munoz Marin Intl flight deals.

Search Deals

Provider most trusted by Cheapflights users for Lambert-St Louis-San Juan Luis Munoz Marin Intl flights.

Search Deals

From Lambert-St Louis to San Juan Luis Munoz Marin Intl

Search Deals

One-way flight from Lambert-St Louis to San Juan Luis Munoz Marin Intl

Search Deals

Highest demand for flights based on searches. 11% potential increase in price ($58 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 October 2025

Search Deals

Cheapflights Fare Finder

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

Fly to

Route

Depart

Return

Price

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Thu 11/20

3:14 pm-1:06 am

1 stop7h 52m

San Juan Luis Munoz Marin Intl

Mon 11/24

10:22 pm-11:57 pm

1 stop27h 35m

$301

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 1/14

8:15 am-7:05 pm

2 stops8h 50m

San Juan Luis Munoz Marin Intl

Wed 1/21

5:40 am-12:45 pm

2 stops9h 05m

$344

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 11/14

1:10 pm-10:22 pm

1 stop7h 12m

San Juan Luis Munoz Marin Intl

Tue 11/18

2:05 am-10:40 am

1 stop10h 35m

$355

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 11/28

5:45 pm-10:25 am

2 stops14h 40m

San Juan Luis Munoz Marin Intl

Tue 12/9

9:40 am-7:30 pm

1 stop11h 50m

$365

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Thu 12/4

2:00 pm-10:05 pm

1 stop6h 05m

San Juan Luis Munoz Marin Intl

Sat 12/13

6:15 am-4:55 pm

1 stop12h 40m

$385

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Mon 12/1

5:40 am-5:20 pm

2 stops9h 40m

San Juan Luis Munoz Marin Intl

Sat 12/13

6:15 am-4:55 pm

1 stop12h 40m

$385

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Thu 11/27

3:14 pm-9:40 am

2 stops16h 26m

San Juan Luis Munoz Marin Intl

Fri 12/5

5:09 pm-10:33 pm

1 stop7h 24m

$391

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Thu 12/4

6:00 am-11:52 pm

1 stop15h 52m

San Juan Luis Munoz Marin Intl

Sat 12/13

6:25 am-8:38 pm

1 stop16h 13m

$400

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Tue 12/2

2:00 pm-12:35 am

1 stop8h 35m

San Juan Luis Munoz Marin Intl

Sat 12/13

8:50 am-12:00 pm

Nonstop5h 10m

$400

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sun 1/25

7:30 am-8:30 pm

1 stop11h 00m

$113

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/25

Showing 1-10 of 17 results

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

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 October.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars
AranGrant	Price Accuracy2 stars	Trust Score*3 stars
Priceline	Price Accuracy1 star	Trust Score*3 stars
CheapTicketsDeal	Price Accuracy3 stars	Trust Score*3 stars
Cheapflightsfares	Price Accuracy3 stars	Trust Score*2 stars
CheapOair	Price Accuracy3 stars	Trust 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 CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on St. Louis-San Juan Luis Munoz Marin Intl Airport flight deals on Cheapflights vs. CheapOair >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 CheapOair the most. CheapOair 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

Prices

Delays

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

Booking 75 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, May is the cheapest month in which you can book a flight from St. Louis to San Juan Luis Munoz Marin Intl Airport (average of $140). Flying from St. Louis to San Juan Luis Munoz Marin Intl Airport in December is currently the most expensive (average of $261). 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?

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 52% versus a flight at noon.

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

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

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

4,236 reviews

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

4,236 reviews

Southwest

8.0

Very good

4,236 reviews

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

7.9

Good

7,996 reviews

Southwest

8.0

Very good

4,236 reviews

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

United Airlines

7.4

Good

8,997 reviews

Southwest

8.0

Very good

4,236 reviews

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

11,033 reviews

Southwest

8.0

Very good

4,236 reviews

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

3,122 reviews

Southwest

8.0

Very good

4,236 reviews

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

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.
How long is the flight from St. Louis to San Juan Luis Munoz Marin Intl Airport?
Airlines like Frontier, Southwest, and United Airlines fly from St. Louis to San Juan Luis Munoz Marin Intl Airport in about 7h 12m. The time it takes to get you to your destination can typically vary by up to 1h 38m. St. Louis and San Juan Luis Munoz Marin Intl Airport are separated by a distance of 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 St. Louis to San Juan Luis Munoz Marin Intl Airport round-trip?
According to our current data, Frontier ($140), Spirit Airlines ($170), and Delta ($206) offers the cheapest pricing from St. Louis to San Juan Luis Munoz Marin Intl Airport. Frontier is 68% cheaper than the average price of flights available within the next 90 days to this destination.
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, May is the cheapest month in which you can book a flight from St. Louis to San Juan Luis Munoz Marin Intl Airport (average of $140). Flying from St. Louis to San Juan Luis Munoz Marin Intl Airport in December is currently the most expensive (average of $261). 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

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Fajardo

Rio Grande

Luquillo

Humacao

Browse thousands of different options on Cheapflights for your next trip

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

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$140	Average$279	FlexibilityNo cancel fee	On-time62%
Spirit Airlines	Cheapest$170	Average$329	FlexibilityNo cancel fee	On-time65%
Delta	Cheapest$206	Average$383	FlexibilityNo cancel fee	On-timeN/A
Southwest	Cheapest$219	Average$597	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$225	Average$376	FlexibilityNo cancel fee	On-time69%
American Airlines	Cheapest$259	Average$529	FlexibilityNo cancel fee	On-time71%

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$113+ 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 1/25. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from St. Louis to Luis Munoz Marin Intl with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Lambert-St Louis to San Juan Luis Munoz Marin Intl are usually found in September or April, booked 75 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

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

Cheapest flights from St. Louis to Luis Munoz Marin IntlExplore 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 October 27, 2025.

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 October 27, 2025.

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

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

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.

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 October.

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.

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?

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

What is the cheapest time of day to fly from STL to SJU?

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

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

How often are flights from St. Louis to San Juan delayed?

What is the most punctual flight time for St. Louis to San Juan flights?

What day of the week experiences the fewest flight delays on this route?

Which airline has the best punctuality record on St. Louis to San Juan flights?

Reviews of airlines servicing Luis Munoz Marin Intl

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.

Related info for your journey

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Alternative routes for St. Louis to Luis Munoz Marin Intl

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

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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 October 27, 2025.