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

Frontier, United Airlines, and Delta are the most popular carriers operating from Lambert-St Louis to San Juan

How many flights depart from St. Louis to San Juan on average per week?

The number of flights available between St. Louis and San Juan is 1 per week as of March 2026. The most frequent departure day is Sat, with 100% of weekly flights leaving on this day.

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 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 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 43% of people opting to fly with this airline when traveling to San Juan. Keep in mind that there are 6 different airlines that fly to San Juan on a routine basis, so you have a few additional options to choose from.

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

Historically, on average around 24% 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 86 minutes.

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 22% of their flights experiencing any sort of delay.

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 6 as of March 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.

$87 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 $316 to $514. The lowest price recently found on this route was $262.

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Find the cheapest flights from St. Louis to San Juan

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

1:03 pm - 8:24 pm

STL

SJU

6h 21m

1 stop

5:43 pm - 11:59 pm

SJU

STL

7h 16m

1 stop

$262Delta

Sat, May 2 - Wed, May 13

4:59 pm - 9:54 am

STL

SJU

15h 55m

1 stop

3:08 am - 11:19 pm

SJU

STL

21h 11m

1 stop

$263Frontier

Mon, Apr 20 - Mon, Apr 27

4:59 pm - 10:39 am

STL

SJU

16h 40m

1 stop

6:00 am - 12:21 am

SJU

STL

19h 21m

1 stop

$266Frontier

Sat, May 2 - Sat, May 9

4:59 pm - 2:01 am

STL

SJU

8h 02m

1 stop

6:30 am - 11:19 pm

SJU

STL

17h 49m

1 stop

$271Frontier

Sat, Apr 11 - Sun, Apr 19

3:33 pm - 4:55 am

STL

SJU

12h 22m

1 stop

6:25 am - 2:48 pm

SJU

STL

9h 23m

1 stop

$276Frontier

Mon, Aug 17 - Sat, Aug 22

11:42 am - 8:24 pm

STL

SJU

7h 42m

1 stop

7:30 am - 4:10 pm

SJU

STL

9h 40m

1 stop

$279Delta

Sat, May 2 - Fri, May 22

11:21 am - 12:52 am

STL

SJU

12h 31m

1 stop

3:19 pm - 11:19 pm

SJU

STL

9h 00m

1 stop

$281Frontier

Tue, Apr 7 - Wed, Apr 15

5:51 am - 6:10 pm

STL

SJU

11h 19m

2 stops

6:45 am - 5:21 pm

SJU

STL

11h 36m

1 stop

$282American Airlines

Sun, Apr 26 - Thu, Apr 30

5:24 am - 2:52 pm

STL

SJU

8h 28m

1 stop

7:00 pm - 10:16 am

SJU

STL

16h 16m

1 stop

$287American Airlines

Wed, Apr 15 - Wed, Apr 22

7:25 am - 4:23 pm

STL

SJU

7h 58m

1 stop

5:43 pm - 11:59 pm

SJU

STL

7h 16m

1 stop

$289Delta

Wed, May 6 - Fri, May 22

Delta flights from St. Louis to San Juan

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

Delta

May 2

STL1:03 pmLambert-St Louis

6h 21m

1 stop

SJU8:24 pmSan Juan Luis Munoz Marin Intl

May 13

SJU5:43 pmSan Juan Luis Munoz Marin Intl

7h 16m

1 stop

STL11:59 pmLambert-St Louis

$262

Delta

May 2

STL11:42 amLambert-St Louis

7h 42m

1 stop

SJU8:24 pmSan Juan Luis Munoz Marin Intl

May 22

SJU7:30 amSan Juan Luis Munoz Marin Intl

9h 40m

1 stop

STL4:10 pmLambert-St Louis

$279

Delta

May 6

STL7:25 amLambert-St Louis

7h 58m

1 stop

SJU4:23 pmSan Juan Luis Munoz Marin Intl

May 22

SJU5:43 pmSan Juan Luis Munoz Marin Intl

7h 16m

1 stop

STL11:59 pmLambert-St Louis

$289

American Airlines flights from St. Louis to San Juan

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

American Airlines

Apr 26

STL5:24 amLambert-St Louis

11h 46m

1 stop

SJU6:10 pmSan Juan Luis Munoz Marin Intl

Apr 30

SJU11:43 amSan Juan Luis Munoz Marin Intl

11h 41m

1 stop

STL10:24 pmLambert-St Louis

$282

American Airlines

Apr 15

STL5:24 amLambert-St Louis

8h 28m

1 stop

SJU2:52 pmSan Juan Luis Munoz Marin Intl

Apr 22

SJU7:00 pmSan Juan Luis Munoz Marin Intl

16h 16m

1 stop

STL10:16 amLambert-St Louis

$287

American Airlines

May 2

STL8:57 amLambert-St Louis

10h 54m

2 stops

SJU8:51 pmSan Juan Luis Munoz Marin Intl

May 19

SJU5:45 amSan Juan Luis Munoz Marin Intl

17h 39m

1 stop

STL10:24 pmLambert-St Louis

$322

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 5/2

1:03 pm-8:24 pm

1 stop6h 21m

San Juan Luis Munoz Marin Intl

Wed 5/13

5:43 pm-11:59 pm

1 stop7h 16m

$262

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Mon 4/20

4:59 pm-9:54 am

1 stop15h 55m

San Juan Luis Munoz Marin Intl

Mon 4/27

3:08 am-11:19 pm

1 stop21h 11m

$263

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 5/2

4:59 pm-10:39 am

1 stop16h 40m

San Juan Luis Munoz Marin Intl

Sat 5/9

6:00 am-12:21 am

1 stop19h 21m

$266

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 4/11

4:59 pm-2:01 am

1 stop8h 02m

San Juan Luis Munoz Marin Intl

Sun 4/19

6:30 am-11:19 pm

1 stop17h 49m

$271

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Mon 8/17

3:33 pm-4:55 am

1 stop12h 22m

San Juan Luis Munoz Marin Intl

Sat 8/22

6:25 am-2:48 pm

1 stop9h 23m

$276

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 5/2

11:42 am-8:24 pm

1 stop7h 42m

San Juan Luis Munoz Marin Intl

Fri 5/22

7:30 am-4:10 pm

1 stop9h 40m

$279

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Tue 4/7

11:21 am-12:52 am

1 stop12h 31m

San Juan Luis Munoz Marin Intl

Wed 4/15

3:19 pm-11:19 pm

1 stop9h 00m

$281

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sun 4/26

5:51 am-6:10 pm

2 stops11h 19m

San Juan Luis Munoz Marin Intl

Thu 4/30

6:45 am-5:21 pm

1 stop11h 36m

$282

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 4/15

5:24 am-2:52 pm

1 stop8h 28m

San Juan Luis Munoz Marin Intl

Wed 4/22

7:00 pm-10:16 am

1 stop16h 16m

$287

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 5/6

7:25 am-4:23 pm

1 stop7h 58m

San Juan Luis Munoz Marin Intl

Fri 5/22

5:43 pm-11:59 pm

1 stop7h 16m

$289

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

Other information

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 September, then April is your next best option. Flight prices from St. Louis to San Juan during April average around $345.

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 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 $426 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 $342 on momondo.

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

There is only 1 cabin class available to choose from on Lambert-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	6h 20m
Direct flights	Sun
Airports in San Juan	2 airports

The fastest flight from St. Louis to San Juan takes 6h 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

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 6h 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 6 as of March 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 5.7 3,019 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $146	Free Cancellation	Rating 6.3 8,532 reviews	Search Spirit Airlines flights
Delta	PriceFrom $197	Free Cancellation	Rating 7.9 8,314 reviews	Search Delta flights
Southwest	PriceFrom $219	Free Cancellation	Rating 8.0 4,324 reviews	Search Southwest flights
United Airlines	PriceFrom $225	Free Cancellation	Rating 7.4 9,455 reviews	Search United Airlines flights
American Airlines	PriceFrom $228	Free Cancellation	Rating 7.1 11,486 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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Cheap flights from St. Louis to San Juan from $87

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 4/20. 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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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 to San Juan?

What cabin class options are available on Lambert-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?

How many flights depart from St. Louis to San Juan on average per week?

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

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

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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

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