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.

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

Historically, on average around 29% 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 95 minutes.

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

Frontier, Delta, and Southwest are the most popular carriers operating from Lambert-St Louis to Puerto Rico

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 28% of their flights experiencing any sort of delay.

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 40% of people opting to fly with this airline when traveling to Puerto Rico. Keep in mind that there are 5 different airlines that fly to Puerto Rico on a routine basis, so you have a few additional options to choose from.

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 5 as of July 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.

$118 Cheap Flights from St. Louis to Puerto Rico in 2026

Discover deals from 900+ travel sites with momondo.

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.

5:13 pm - 9:24 am

STL

SJU

15h 11m

2 stops

2:58 pm - 9:49 pm

SJU

STL

7h 51m

1 stop

$266American Airlines

Thu, Sep 24 - Wed, Sep 30

6:00 am - 6:30 pm

STL

SJU

11h 30m

2 stops

3:47 pm - 10:40 pm

SJU

STL

7h 53m

1 stop

$267American Airlines

Mon, Aug 24 - Thu, Aug 27

5:00 am - 2:38 pm

STL

SJU

8h 38m

1 stop

7:03 am - 11:34 pm

SJU

STL

17h 31m

1 stop

$271American Airlines

Wed, Aug 12 - Sat, Aug 15

8:00 am - 8:38 pm

STL

SJU

11h 38m

2 stops

1:25 pm - 9:09 pm

SJU

STL

8h 44m

1 stop

$285United Airlines

Wed, Sep 23 - Sun, Sep 27

4:57 pm - 12:41 am

STL

SJU

30h 44m

2 stops

5:20 pm - 5:37 pm

SJU

STL

25h 17m

1 stop

$287Frontier

Wed, Aug 5 - Wed, Aug 12

4:57 pm - 12:41 am

STL

SJU

30h 44m

2 stops

3:48 pm - 5:22 pm

SJU

STL

26h 34m

1 stop

$290Frontier

Sat, Aug 15 - Thu, Aug 20

6:34 pm - 12:41 am

STL

SJU

29h 07m

2 stops

3:10 am - 11:59 pm

SJU

STL

21h 49m

1 stop

$297Frontier

Tue, Aug 4 - Mon, Aug 10

4:57 pm - 12:41 am

STL

SJU

30h 44m

2 stops

3:10 am - 11:59 pm

SJU

STL

21h 49m

1 stop

$299Frontier

Fri, Aug 7 - Mon, Aug 10

5:13 pm - 9:24 am

STL

SJU

15h 11m

2 stops

3:35 pm - 9:24 am

SJU

STL

18h 49m

1 stop

$301American Airlines

Thu, Sep 17 - Mon, Sep 21

6:00 am - 5:21 pm

STL

CPX

10h 21m

2 stops

10:48 am - 10:27 pm

CPX

STL

12h 39m

2 stops

$1,302United Airlines

Sat, Aug 29 - Tue, Sep 1

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Frontier flights from St. Louis to Puerto Rico

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

Frontier

Aug 5

STL4:57 pmLambert-St Louis

30h 44m

2 stops

SJU12:41 amSan Juan Luis Munoz Marin Intl

Aug 12

SJU5:20 pmSan Juan Luis Munoz Marin Intl

25h 17m

1 stop

STL5:37 pmLambert-St Louis

$287

Frontier

Aug 15

STL4:57 pmLambert-St Louis

30h 44m

2 stops

SJU12:41 amSan Juan Luis Munoz Marin Intl

Aug 20

SJU3:48 pmSan Juan Luis Munoz Marin Intl

26h 34m

1 stop

STL5:22 pmLambert-St Louis

$290

Frontier

Aug 4

STL6:34 pmLambert-St Louis

29h 07m

2 stops

SJU12:41 amSan Juan Luis Munoz Marin Intl

Aug 10

SJU3:10 amSan Juan Luis Munoz Marin Intl

21h 49m

1 stop

STL11:59 pmLambert-St Louis

$297

American Airlines flights from St. Louis to Puerto Rico

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

American Airlines

Sep 24

STL6:00 amLambert-St Louis

13h 47m

2 stops

SJU8:47 pmSan Juan Luis Munoz Marin Intl

Sep 30

SJU6:00 amSan Juan Luis Munoz Marin Intl

13h 04m

2 stops

STL6:04 pmLambert-St Louis

$266

American Airlines

Aug 24

STL6:00 amLambert-St Louis

11h 30m

2 stops

SJU6:30 pmSan Juan Luis Munoz Marin Intl

Aug 27

SJU3:47 pmSan Juan Luis Munoz Marin Intl

7h 53m

1 stop

STL10:40 pmLambert-St Louis

$267

American Airlines

Aug 12

STL5:00 amLambert-St Louis

8h 38m

1 stop

SJU2:38 pmSan Juan Luis Munoz Marin Intl

Aug 15

SJU7:03 amSan Juan Luis Munoz Marin Intl

17h 31m

1 stop

STL11:34 pmLambert-St Louis

$271

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Thu 9/24

5:13 pm-9:24 am

2 stops15h 11m

San Juan Luis Munoz Marin Intl

Wed 9/30

2:58 pm-9:49 pm

1 stop7h 51m

$266

Quickest round-trip

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Mon 8/24

6:00 am-6:30 pm

2 stops11h 30m

San Juan Luis Munoz Marin Intl

Thu 8/27

3:47 pm-10:40 pm

1 stop7h 53m

$267

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 8/12

5:00 am-2:38 pm

1 stop8h 38m

San Juan Luis Munoz Marin Intl

Sat 8/15

7:03 am-11:34 pm

1 stop17h 31m

$271

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 9/23

8:00 am-8:38 pm

2 stops11h 38m

San Juan Luis Munoz Marin Intl

Sun 9/27

1:25 pm-9:09 pm

1 stop8h 44m

$285

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 8/5

4:57 pm-12:41 am

2 stops30h 44m

San Juan Luis Munoz Marin Intl

Wed 8/12

5:20 pm-5:37 pm

1 stop25h 17m

$287

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 8/15

4:57 pm-12:41 am

2 stops30h 44m

San Juan Luis Munoz Marin Intl

Thu 8/20

3:48 pm-5:22 pm

1 stop26h 34m

$290

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Tue 8/4

6:34 pm-12:41 am

2 stops29h 07m

San Juan Luis Munoz Marin Intl

Mon 8/10

3:10 am-11:59 pm

1 stop21h 49m

$297

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 8/7

4:57 pm-12:41 am

2 stops30h 44m

San Juan Luis Munoz Marin Intl

Mon 8/10

3:10 am-11:59 pm

1 stop21h 49m

$299

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Thu 9/17

5:13 pm-9:24 am

2 stops15h 11m

San Juan Luis Munoz Marin Intl

Mon 9/21

3:35 pm-9:24 am

1 stop18h 49m

$301

St. LouisCulebra

STL - CPX

STLCPX

Lambert-St Louis

Sat 8/29

6:00 am-5:21 pm

2 stops10h 21m

Culebra

Tue 9/1

10:48 am-10:27 pm

2 stops12h 39m

$1,302

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 November, then you should wait until March to fly from St. Louis, when ticket prices are also cheap, with an average price of $133.

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 from St. Louis 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 $427 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 $348 on momondo.

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

There is only 1 cabin class available to choose from on 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.

Can stopping save me money on St. Louis to Puerto Rico flights?

You could potentially save up to 5% on your flight if you consider stops on a St. Louis to Puerto Rico flight.

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

Best Price Found	$458
Fastest flight time	4h 20m
Direct flights	Sun
Airports in Puerto Rico	20 airports

The best flight deal from St. Louis to Puerto Rico found on momondo in the last 72 hours is $458

The fastest flight from St. Louis to Puerto Rico takes 4h 20m

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

Frequently asked questions about flying from 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 5 as of July 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) (63.64% of total bookings). The next most popular plane models are Boeing 737 MAX 8 (18.18%), Airbus A321-100/200 (9.09%), and Boeing 737 (9.09%).

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 $148	Free Cancellation	Rating 5.6 2,835 reviews	Search Frontier flights
Delta	PriceFrom $205	Free Cancellation	Rating 7.8 8,456 reviews	Search Delta flights
United Airlines	PriceFrom $225	Free Cancellation	Rating 7.4 9,966 reviews	Search United Airlines flights
American Airlines	PriceFrom $250	Free Cancellation	Rating 7.1 11,799 reviews	Search American Airlines flights
Southwest	PriceFrom $269	Free Cancellation	Rating 7.9 4,248 reviews	Search Southwest 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

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.

Start using Trips

Find my bookings

Get notified when prices go down

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

1 adult

Sun 8/9

Sun 8/16

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Puerto Rico

Popular cities

Other flights from St. Louis

Other flights to Puerto Rico

Airlines

Cabin classes

Complete your trip

Feeling lucky

Popular cities in Puerto Rico

Flights to San Juanfrom $78

Flights to Aguadillafrom $195

Flights to Poncefrom $217

Flights to Viequesfrom $441

Flights to Culebrafrom $399

Flights to Mayagüezfrom $379

Cheap flights from St. Louis to Puerto Rico from $118

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 10/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Find the cheapest flights from St. Louis to Puerto Rico

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Cheap direct flights

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Frontier flights from St. Louis to Puerto Rico

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

American Airlines flights from St. Louis to Puerto Rico

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

momondo Fare Finder

Use the filters below to find and compare flights from St. Louis to Puerto Rico that are best for you.

See travel insights to Puerto Rico from

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 from St. Louis to Puerto Rico?

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

Can stopping save me money on 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

Best Price Found

Fastest flight time

Direct flights

Airports in Puerto Rico

Frequently asked questions about flying from St. Louis to 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.

Complete your trip to Puerto Rico

Explore popular destinations other users love

According to popular flight searches on momondo this year