What airlines fly to Puerto Rico?

American Airlines, Frontier and Southwest are the top three most popular airlines that fly to Puerto Rico from St. Louis according to our data. American Airlines is the first choice among our users, with 42% of people opting to fly with this airline when traveling to Puerto Rico. Keep in mind that there are 6 different airlines that fly to Puerto Rico 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 Puerto Rico 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.

Which airline has the best punctuality record on St. Louis to Puerto Rico flights?

According to our data, Southwest have had the least number of delays on this route over the last 12 months; with about 23% of their flights experiencing any sort of delay.

How often are flights from St. Louis to Puerto Rico delayed?

Historically, on average around 24% of flights between St. Louis and Puerto Rico have experienced a delay on any given week. The average delay length over the past 12 months has been 86 minutes.

What is the cheapest airline that flies from Lambert-St Louis to Puerto Rico?

Delta is the most popular carrier operating from Lambert-St Louis to Puerto Rico

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

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

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

The number of operators available for flights from Lambert-St Louis Airport to Puerto Rico is 6 as of March 2026.

How old do you have to be to fly from Lambert-St Louis Airport to Puerto Rico?

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 Puerto Rico.

What documentation or ID do you need to fly to Puerto Rico?

The travel and health documents you'll need for your trip to Puerto Rico 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 Puerto Rico. 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 Puerto Rico in 2026

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Find the cheapest flights from St. Louis to Puerto Rico

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

4:59 pm - 9:54 am

STL

SJU

15h 55m

1 stop

3:03 am - 2:48 pm

SJU

STL

12h 45m

2 stops

$261Frontier

Sun, May 3 - Wed, May 6

3:33 pm - 4:49 am

STL

SJU

12h 16m

1 stop

6:09 pm - 12:21 am

SJU

STL

7h 12m

1 stop

$264Frontier

Sun, May 31 - Fri, Jun 5

4:19 pm - 2:08 am

STL

SJU

8h 49m

1 stop

6:16 pm - 12:14 am

SJU

STL

6h 58m

1 stop

$270Frontier

Fri, Jun 5 - Fri, Jun 12

4:59 pm - 2:01 am

STL

SJU

8h 02m

1 stop

3:39 pm - 11:19 pm

SJU

STL

8h 40m

1 stop

$271Frontier

Mon, Apr 27 - Sun, May 3

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

Fri, Jun 19 - Wed, Jun 24

8:23 pm - 7:14 pm

STL

SJU

21h 51m

1 stop

11:30 am - 10:30 am

SJU

STL

24h 00m

2 stops

$279Multiple Airlines

Sat, Apr 18 - Wed, Apr 22

4:59 pm - 2:01 am

STL

SJU

8h 02m

1 stop

3:19 pm - 11:19 pm

SJU

STL

9h 00m

1 stop

$281Frontier

Sat, Apr 18 - Sat, Apr 25

10:09 am - 4:13 pm

STL

CPX

29h 04m

2 stops

10:30 am - 8:43 pm

CPX

STL

35h 13m

2 stops

$1,448United Airlines

Sat, Apr 25 - Wed, Apr 29

8:45 am - 4:13 pm

STL

CPX

30h 28m

2 stops

10:30 am - 10:30 pm

CPX

STL

13h 00m

2 stops

$1,771United Airlines

Tue, May 12 - Thu, May 14

8:45 am - 4:13 pm

STL

CPX

30h 28m

2 stops

10:30 am - 9:30 am

CPX

STL

24h 00m

2 stops

$1,834United Airlines

Tue, May 12 - Thu, May 14

Frontier flights from St. Louis to Puerto Rico

Our best Frontier deals on St. Louis to Puerto Rico flight tickets

Frontier

Apr 8

STL4:59 pmLambert-St Louis

8h 02m

1 stop

SJU2:01 amSan Juan Luis Munoz Marin Intl

Apr 11

SJU5:21 pmSan Juan Luis Munoz Marin Intl

7h 04m

1 stop

STL11:25 pmLambert-St Louis

$260

Frontier

Apr 1

STL4:54 pmLambert-St Louis

6h 08m

1 stop

SJU12:02 amSan Juan Luis Munoz Marin Intl

Apr 8

SJU6:30 amSan Juan Luis Munoz Marin Intl

17h 55m

1 stop

STL11:25 pmLambert-St Louis

$261

Frontier

Jun 2

STL4:19 pmLambert-St Louis

8h 49m

1 stop

SJU2:08 amSan Juan Luis Munoz Marin Intl

Jun 5

SJU6:09 pmSan Juan Luis Munoz Marin Intl

7h 12m

1 stop

STL12:21 amLambert-St Louis

$264

American Airlines flights from St. Louis to Puerto Rico

Our best American Airlines deals on St. Louis to Puerto Rico flight tickets

American Airlines

Apr 13

STL5:51 amLambert-St Louis

11h 19m

2 stops

SJU6:10 pmSan Juan Luis Munoz Marin Intl

Apr 17

SJU3:44 pmSan Juan Luis Munoz Marin Intl

7h 40m

1 stop

STL10:24 pmLambert-St Louis

$516

American Airlines

Apr 8

STL6:00 amLambert-St Louis

11h 10m

2 stops

SJU6:10 pmSan Juan Luis Munoz Marin Intl

Apr 12

SJU6:45 amSan Juan Luis Munoz Marin Intl

17h 14m

1 stop

STL10:59 pmLambert-St Louis

$681

American Airlines

Apr 1

STL9:37 amLambert-St Louis

9h 57m

2 stops

SJU8:34 pmSan Juan Luis Munoz Marin Intl

Apr 4

SJU1:30 amSan Juan Luis Munoz Marin Intl

8h 25m

1 stop

STL8:55 amLambert-St Louis

$721

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sun 5/3

4:59 pm-9:54 am

1 stop15h 55m

San Juan Luis Munoz Marin Intl

Wed 5/6

3:03 am-2:48 pm

2 stops12h 45m

$261

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sun 5/31

3:33 pm-4:49 am

1 stop12h 16m

San Juan Luis Munoz Marin Intl

Fri 6/5

6:09 pm-12:21 am

1 stop7h 12m

$264

Quickest round-trip

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 6/5

4:19 pm-2:08 am

1 stop8h 49m

San Juan Luis Munoz Marin Intl

Fri 6/12

6:16 pm-12:14 am

1 stop6h 58m

$270

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Mon 4/27

4:59 pm-2:01 am

1 stop8h 02m

San Juan Luis Munoz Marin Intl

Sun 5/3

3:39 pm-11:19 pm

1 stop8h 40m

$271

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 6/19

3:33 pm-4:55 am

1 stop12h 22m

San Juan Luis Munoz Marin Intl

Wed 6/24

6:25 am-2:48 pm

1 stop9h 23m

$276

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 4/18

8:23 pm-7:14 pm

1 stop21h 51m

San Juan Luis Munoz Marin Intl

Wed 4/22

11:30 am-10:30 am

2 stops24h 00m

$279

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 4/18

4:59 pm-2:01 am

1 stop8h 02m

San Juan Luis Munoz Marin Intl

Sat 4/25

3:19 pm-11:19 pm

1 stop9h 00m

$281

St. LouisCulebra

STL - CPX

STLCPX

Lambert-St Louis

Sat 4/25

10:09 am-4:13 pm

2 stops29h 04m

Culebra

Wed 4/29

10:30 am-8:43 pm

2 stops35h 13m

$1,448

St. LouisCulebra

STL - CPX

STLCPX

Lambert-St Louis

Tue 5/12

8:45 am-4:13 pm

2 stops30h 28m

Culebra

Thu 5/14

10:30 am-10:30 pm

2 stops13h 00m

$1,771

St. LouisCulebra

STL - CPX

STLCPX

Lambert-St Louis

Tue 5/12

8:45 am-4:13 pm

2 stops30h 28m

Culebra

Thu 5/14

10:30 am-9:30 am

2 stops24h 00m

$1,834

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 Puerto Rico

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 cheapest month to fly to Puerto Rico?

If you don’t want to visit Puerto Rico in September, then you should wait until April to fly from St. Louis, when ticket prices are also cheap, with an average price of $345.

What is the cheapest Lambert-St Louis to Puerto Rico flight route?

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

How far in advance should I book a flight to Puerto Rico?

You are more likely to see cheaper flights to Puerto Rico from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Puerto Rico for around $426 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Puerto Rico from St. Louis for as low as $342 on momondo.

What cabin class options are available on Lambert-St Louis to Puerto Rico flights?

There is only 1 cabin class available to choose from on Lambert-St Louis to Puerto Rico 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 Puerto Rico flight deals and tips

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

Fastest flight time	4h 25m
Direct flights	Sun
Airports in Puerto Rico	20 airports

The fastest flight from St. Louis to Puerto Rico takes 4h 25m

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

There are 20 airports in Puerto Rico. From St. Louis there are direct flights to San Juan Luis Munoz Marin Intl (SJU).

Search flight deals

When did momondo last update prices for flights from Lambert-St Louis Airport to Puerto Rico?
Prices for flights from Lambert-St Louis Airport to Puerto Rico are refreshed on a daily basis.
How many operators does momondo search for flights from Lambert-St Louis Airport to Puerto Rico?
The number of operators available for flights from Lambert-St Louis Airport to Puerto Rico is 6 as of March 2026.
How old do you have to be to fly from Lambert-St Louis Airport to Puerto Rico?
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 Puerto Rico.
What documentation or ID do you need to fly to Puerto Rico?
The travel and health documents you'll need for your trip to Puerto Rico 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 Puerto Rico. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from St. Louis to Puerto Rico?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from St. Louis to Puerto Rico is Boeing 737-800 Passenger/BBJ2 (winglets) (50.00% of total bookings). The next most popular plane models are Boeing 737 MAX 8 (25.00%) and Boeing 737-700 Passenger/BBJ1 (winglets) (25.00%).

Best airlines flying from St. Louis to Puerto Rico

Compare and see reviews for airlines that fly from St. Louis to Puerto Rico with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $138	Free Cancellation	Rating 5.7 3,009 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $146	Free Cancellation	Rating 6.3 8,566 reviews	Search Spirit Airlines flights
Delta	PriceFrom $197	Free Cancellation	Rating 7.9 8,365 reviews	Search Delta flights
Southwest	PriceFrom $219	Free Cancellation	Rating 8.0 4,332 reviews	Search Southwest flights
United Airlines	PriceFrom $225	Free Cancellation	Rating 7.4 9,525 reviews	Search United Airlines flights
American Airlines	PriceFrom $227	Free Cancellation	Rating 7.1 11,542 reviews	Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Puerto Rico?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Puerto Rico from St. Louis.

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

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

How can momondo help me find flights from St. Louis to Puerto Rico?

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 Puerto Rico.

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

Yes. momondo can track prices for St. Louis to Puerto Rico 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.

An easier way to manage your Puerto Rico trip

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Popular cities in Puerto Rico

Flights to San Juanfrom $99

Flights to Aguadillafrom $191

Flights to Poncefrom $176

Flights to Mayagüezfrom $363

Flights to Culebrafrom $403

Cheap flights from St. Louis to Puerto Rico 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 Puerto Rico departing on 4/27. 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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Frontier flights from St. Louis to Puerto Rico

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How to get the cheapest flight ticket from St. Louis to Puerto Rico

What is the cheapest month to fly to Puerto Rico?

What is the cheapest Lambert-St Louis to Puerto Rico flight route?

How far in advance should I book a flight to Puerto Rico?

What cabin class options are available on Lambert-St Louis to Puerto Rico flights?

What is the cheapest airline that flies from Lambert-St Louis to Puerto Rico?

What airlines fly to Puerto Rico?

How often are flights from St. Louis to Puerto Rico delayed?

What is the most punctual flight time for St. Louis to Puerto Rico 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 Puerto Rico flights?

Cheap St. Louis to Puerto Rico flight deals and tips

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

Fastest flight time

Direct flights

Airports in Puerto Rico

Best airlines flying from St. Louis to Puerto Rico

Compare and see reviews for airlines that fly from St. Louis to Puerto Rico with momondo

Why use momondo?

An easier way to manage your Puerto Rico 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

Popular cities in Puerto Rico

Popular flights according to clicks in the last 7 days on momondo

St. Louis flight routes

According to popular flight searches on momondo this year

Puerto Rico flight routes

According to popular flight searches on momondo this year

Fly your favorite airline to Puerto Rico

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Puerto Rico

List of cabin classes available on flights landing in Puerto Rico. Availability may vary depending on flight origin and airline.

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According to popular flight searches on momondo this year