What airlines fly to San Juan?

American Airlines, Frontier and Southwest are the top three most popular airlines that fly to San Juan from St. Louis according to our data. American Airlines is the first choice among our users, with 41% of people opting to fly with this airline when traveling to San Juan. Keep in mind that there are 5 different airlines that fly to San Juan on a routine basis, so you have a few additional options to choose from.

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

Generally, flights departing in the morning tend to experience fewer delays. Flights in the early afternoon have, in the past, seen delays more frequently in comparison.

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

Saturday is statistically the day of the week which experiences the fewest number of delays on this flight route. Monday has historically seen more delays on average compared to the rest of the week.

What is the cheapest airline that flies from Lambert-St Louis to San Juan?

Delta and Southwest are the most popular carriers operating from Lambert-St Louis to San Juan

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

According to our data, Southwest have had the least number of delays on this route over the last 12 months; with about 31% of their flights experiencing any sort of delay.

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

Historically, on average around 32% of flights between St. Louis and San Juan have experienced a delay on any given week. The average delay length over the past 12 months has been 94 minutes.

When did momondo last update prices for flights from Lambert-St Louis Airport to San Juan?

Prices for flights from Lambert-St Louis Airport to San Juan are refreshed on a daily basis.

How many operators does momondo search for flights from Lambert-St Louis Airport to San Juan?

The number of operators available for flights from Lambert-St Louis Airport to San Juan is 5 as of June 2026.

How old do you have to be to fly from Lambert-St Louis Airport to San Juan?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to San Juan.

What documentation or ID do you need to fly to San Juan?

The travel and health documents you'll need for your trip to San Juan may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at San Juan. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$131 Cheap Flights from St. Louis to San Juan in 2026

Q: What is the typical price of a round-trip flight between St. Louis and San Juan?

Prices are currently low for flights on this route. Typical prices usually range from $363 to $594. The lowest price recently found on this route was $327.

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to San Juan

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

10:55 am - 5:15 pm

STL

SJU

4h 20mnonstop

10:55 am - 1:55 pm

SJU

STL

5h 00mnonstop

$327Southwest

Sat, Nov 7 - Sat, Nov 14

4:57 pm - 12:41 am

STL

SJU

30h 44m

2 stops

8:57 pm - 4:11 pm

SJU

STL

20h 14m

1 stop

$329Frontier

Wed, Aug 12 - Wed, Aug 19

11:40 am - 10:50 pm

STL

SJU

10h 10m

1 stop

5:05 am - 11:05 am

SJU

STL

7h 00m

1 stop

$331Southwest

Fri, Sep 18 - Sat, Sep 19

10:55 am - 5:15 pm

STL

SJU

4h 20mnonstop

1:30 pm - 7:35 pm

SJU

STL

8h 05m

1 stop

$332Southwest

Sat, Nov 7 - Sat, Nov 14

2:25 pm - 10:10 pm

STL

SJU

6h 45m

1 stop

1:20 pm - 7:55 pm

SJU

STL

7h 35m

1 stop

$336Southwest

Fri, Sep 18 - Tue, Sep 22

10:44 am - 9:55 pm

STL

SJU

10h 11m

2 stops

2:58 pm - 10:42 pm

SJU

STL

8h 44m

2 stops

$341American Airlines

Wed, Sep 2 - Wed, Sep 9

4:57 pm - 12:41 am

STL

SJU

30h 44m

2 stops

10:48 pm - 11:59 pm

SJU

STL

26h 11m

1 stop

$345Frontier

Mon, Aug 10 - Fri, Aug 14

4:57 pm - 12:41 am

STL

SJU

30h 44m

2 stops

9:16 am - 4:11 pm

SJU

STL

7h 55m

1 stop

$346Frontier

Fri, Aug 14 - Sat, Aug 22

4:57 pm - 12:41 am

STL

SJU

30h 44m

2 stops

12:13 pm - 11:59 pm

SJU

STL

12h 46m

1 stop

$348Frontier

Sat, Aug 8 - Tue, Aug 11

6:34 pm - 2:00 pm

STL

SJU

42h 26m

2 stops

10:48 pm - 11:59 pm

SJU

STL

26h 11m

1 stop

$356Frontier

Sun, Aug 2 - Fri, Aug 14

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Southwest flights from St. Louis to San Juan

Our best Southwest deals on St. Louis to San Juan flight tickets

Southwest

Nov 7

STL10:55 amLambert-St Louis

4h 20m

SJU5:15 pmSan Juan Luis Munoz Marin Intl

Nov 14

SJU10:55 amSan Juan Luis Munoz Marin Intl

5h 00m

STL1:55 pmLambert-St Louis

$327

Southwest

Sep 18

STL11:40 amLambert-St Louis

10h 10m

1 stop

SJU10:50 pmSan Juan Luis Munoz Marin Intl

Sep 19

SJU5:05 amSan Juan Luis Munoz Marin Intl

7h 00m

1 stop

STL11:05 amLambert-St Louis

$331

Southwest

Nov 7

STL10:55 amLambert-St Louis

4h 20m

SJU5:15 pmSan Juan Luis Munoz Marin Intl

Nov 14

SJU1:30 pmSan Juan Luis Munoz Marin Intl

8h 05m

1 stop

STL7:35 pmLambert-St Louis

$332

Frontier flights from St. Louis to San Juan

Our best Frontier deals on St. Louis to San Juan flight tickets

Frontier

Aug 12

STL4:57 pmLambert-St Louis

30h 44m

2 stops

SJU12:41 amSan Juan Luis Munoz Marin Intl

Aug 19

SJU8:57 pmSan Juan Luis Munoz Marin Intl

20h 14m

1 stop

STL4:11 pmLambert-St Louis

$329

Frontier

Aug 10

STL4:57 pmLambert-St Louis

30h 44m

2 stops

SJU12:41 amSan Juan Luis Munoz Marin Intl

Aug 14

SJU10:48 pmSan Juan Luis Munoz Marin Intl

26h 11m

1 stop

STL11:59 pmLambert-St Louis

$345

Frontier

Aug 14

STL4:57 pmLambert-St Louis

30h 44m

2 stops

SJU12:41 amSan Juan Luis Munoz Marin Intl

Aug 22

SJU9:16 amSan Juan Luis Munoz Marin Intl

7h 55m

1 stop

STL4:11 pmLambert-St Louis

$346

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 11/7

10:55 am-5:15 pm

Nonstop4h 20m

San Juan Luis Munoz Marin Intl

Sat 11/14

10:55 am-1:55 pm

Nonstop5h 00m

$327

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 8/12

4:57 pm-12:41 am

2 stops30h 44m

San Juan Luis Munoz Marin Intl

Wed 8/19

8:57 pm-4:11 pm

1 stop20h 14m

$329

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 9/18

11:40 am-10:50 pm

1 stop10h 10m

San Juan Luis Munoz Marin Intl

Sat 9/19

5:05 am-11:05 am

1 stop7h 00m

$331

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 11/7

10:55 am-5:15 pm

Nonstop4h 20m

San Juan Luis Munoz Marin Intl

Sat 11/14

1:30 pm-7:35 pm

1 stop8h 05m

$332

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 9/18

2:25 pm-10:10 pm

1 stop6h 45m

San Juan Luis Munoz Marin Intl

Tue 9/22

1:20 pm-7:55 pm

1 stop7h 35m

$336

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 9/2

10:44 am-9:55 pm

2 stops10h 11m

San Juan Luis Munoz Marin Intl

Wed 9/9

2:58 pm-10:42 pm

2 stops8h 44m

$341

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Mon 8/10

4:57 pm-12:41 am

2 stops30h 44m

San Juan Luis Munoz Marin Intl

Fri 8/14

10:48 pm-11:59 pm

1 stop26h 11m

$345

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 8/14

4:57 pm-12:41 am

2 stops30h 44m

San Juan Luis Munoz Marin Intl

Sat 8/22

9:16 am-4:11 pm

1 stop7h 55m

$346

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 8/8

4:57 pm-12:41 am

2 stops30h 44m

San Juan Luis Munoz Marin Intl

Tue 8/11

12:13 pm-11:59 pm

1 stop12h 46m

$348

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sun 8/2

6:34 pm-2:00 pm

2 stops42h 26m

San Juan Luis Munoz Marin Intl

Fri 8/14

10:48 pm-11:59 pm

1 stop26h 11m

$356

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from St. Louis to San Juan

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Delays

What is the typical price of a round-trip flight between St. Louis and San Juan?

What is the cheapest month to fly to San Juan?

If you’re not able to fly to San Juan in July, then November is your next best option. Flight prices from St. Louis to San Juan during November average around $113.

What is the cheapest Lambert-St Louis to San Juan flight route?

Fly from Lambert-St Louis to San Juan Luis Munoz Marin Intl for the best Lambert-St Louis - San Juan flight prices

How far in advance should I book a flight from St. Louis to San Juan?

You are more likely to see cheaper flights to San Juan from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to San Juan for around $420 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Juan from St. Louis for as low as $348 on momondo.

What cabin class options are available on St. Louis to San Juan flights?

There is only 1 cabin class available to choose from on St. Louis to San Juan flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Cheap St. Louis to San Juan flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to San Juan

Fastest flight time	4h 20m
Direct flights	Sun
Airports in San Juan	2 airports

The fastest flight from St. Louis to San Juan takes 4h 20m

Direct flights go from St. Louis to San Juan on Sunday. There are no airlines offering direct flights.

There are 2 airports in San Juan. From St. Louis there are direct flights to San Juan Luis Munoz Marin Intl (SJU).

Search flight deals

Frequently asked questions about flying from St. Louis to San Juan

How far is Lambert-St Louis to San Juan by plane?
There are 2005.8 mi between Lambert-St Louis and San Juan. In terms of flight time, this usually takes a little over 4h 20m.
When did momondo last update prices for flights from Lambert-St Louis Airport to San Juan?
Prices for flights from Lambert-St Louis Airport to San Juan are refreshed on a daily basis.
How many operators does momondo search for flights from Lambert-St Louis Airport to San Juan?
The number of operators available for flights from Lambert-St Louis Airport to San Juan is 5 as of June 2026.
How old do you have to be to fly from Lambert-St Louis Airport to San Juan?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to San Juan.
What documentation or ID do you need to fly to San Juan?
The travel and health documents you'll need for your trip to San Juan may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at San Juan. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from St. Louis to San Juan

Compare and see reviews for airlines that fly from St. Louis to San Juan with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $138	Free Cancellation	Rating 5.6 2,866 reviews	Search Frontier flights
Delta	PriceFrom $205	Free Cancellation	Rating 7.8 8,440 reviews	Search Delta flights
United Airlines	PriceFrom $225	Free Cancellation	Rating 7.4 9,887 reviews	Search United Airlines flights
Southwest	PriceFrom $246	Free Cancellation	Rating 7.9 4,243 reviews	Search Southwest flights
American Airlines	PriceFrom $250	Free Cancellation	Rating 7.1 11,756 reviews	Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to San Juan?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from St. Louis to San Juan. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from St. Louis to San Juan with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for St. Louis to San Juan flights to just show those with flexible booking policies.

How can momondo help me find flights from St. Louis to San Juan?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to San Juan.

I’m not ready to book a flight from St. Louis to San Juan right now. Can momondo alert me if prices change?

Yes. momondo can track prices for St. Louis to San Juan flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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Fly into one of these airports located in San Juan

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Cheap flights from St. Louis to San Juan from $131

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to San Juan departing on 9/23. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Southwest flights from St. Louis to San Juan

Our best Southwest deals on St. Louis to San Juan flight tickets

Frontier flights from St. Louis to San Juan

Our best Frontier deals on St. Louis to San Juan flight tickets

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See travel insights to San Juan from

How to get the cheapest flight ticket from St. Louis to San Juan

What is the typical price of a round-trip flight between St. Louis and San Juan?

What is the cheapest month to fly to San Juan?

What is the cheapest Lambert-St Louis to San Juan flight route?

How far in advance should I book a flight from St. Louis to San Juan?

What cabin class options are available on St. Louis to San Juan flights?

What is the cheapest airline that flies from Lambert-St Louis to San Juan?

What airlines fly to San Juan?

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?

Cheap St. Louis to San Juan flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to San Juan

Fastest flight time

Direct flights

Airports in San Juan

Frequently asked questions about flying from St. Louis to San Juan

Best airlines flying from St. Louis to San Juan

Compare and see reviews for airlines that fly from St. Louis to San Juan with momondo

Why use momondo?

An easier way to manage your San Juan trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Puerto Rico

Fly into one of these airports located in San Juan

Airports listed have a maximum distance of 7.1 mi from San Juan

Fly your favorite airline to San Juan

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