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

Generally, flights departing in the early afternoon tend to experience fewer delays. Flights in the morning 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 19% 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 85 minutes.

What airlines fly to Puerto Rico?

American Airlines, Delta and Frontier 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 43% 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 cheapest airline that flies from Lambert-St Louis to Puerto Rico?

Frontier is the most popular carrier 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 17% of their flights experiencing any sort of delay.

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 February 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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Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

3:49 pm - 12:43 am

STL

SJU

6h 54m

1 stop

5:25 pm - 10:27 pm

SJU

STL

7h 02m

1 stop

$188Frontier

man., feb. 23 - ons., mar. 4

4:55 pm - 2:01 am

STL

SJU

8h 06m

1 stop

3:19 pm - 11:19 pm

SJU

STL

9h 00m

1 stop

$202Frontier

lør., maj 9 - ons., maj 13

3:49 pm - 2:53 am

STL

SJU

9h 04m

1 stop

3:19 pm - 11:19 pm

SJU

STL

9h 00m

1 stop

$209Frontier

tir., mar. 3 - ons., mar. 11

3:49 pm - 2:53 am

STL

SJU

9h 04m

1 stop

5:55 pm - 5:57 am

SJU

STL

14h 02m

1 stop

$211Frontier

søn., mar. 1 - lør., mar. 7

4:55 pm - 9:54 am

STL

SJU

15h 59m

1 stop

6:30 am - 11:19 pm

SJU

STL

17h 49m

1 stop

$213Frontier

søn., maj 3 - tir., maj 12

8:22 pm - 2:22 pm

STL

SJU

16h 00m

1 stop

2:59 am - 10:27 pm

SJU

STL

21h 28m

2 stops

$220Multiple Airlines

man., feb. 23 - tir., mar. 3

4:51 pm - 8:54 am

STL

SJU

15h 03m

1 stop

6:30 am - 7:37 am

SJU

STL

26h 07m

1 stop

$221Frontier

tir., mar. 10 - tir., mar. 17

3:49 pm - 2:53 am

STL

SJU

9h 04m

1 stop

11:07 am - 11:19 pm

SJU

STL

13h 12m

1 stop

$223Frontier

man., mar. 2 - tir., mar. 10

3:49 pm - 9:54 am

STL

SJU

16h 05m

1 stop

5:30 am - 8:10 pm

SJU

STL

15h 40m

1 stop

$225Frontier

tir., mar. 3 - søn., mar. 8

8:17 pm - 6:58 pm

STL

SJU

20h 41m

2 stops

4:16 pm - 6:51 am

SJU

STL

16h 35m

1 stop

$227Multiple Airlines

ons., feb. 25 - fre., feb. 27

Frontier flights from St. Louis to Puerto Rico

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

Frontier

Feb 23

STL3:49 pmLambert-St Louis

6h 54m

1 stop

SJU12:43 amSan Juan Luis Munoz Marin Intl

Mar 4

SJU5:25 pmSan Juan Luis Munoz Marin Intl

7h 02m

1 stop

STL10:27 pmLambert-St Louis

$188

Frontier

May 9

STL4:55 pmLambert-St Louis

8h 06m

1 stop

SJU2:01 amSan Juan Luis Munoz Marin Intl

May 13

SJU3:19 pmSan Juan Luis Munoz Marin Intl

9h 00m

1 stop

STL11:19 pmLambert-St Louis

$202

Frontier

Mar 3

STL3:49 pmLambert-St Louis

9h 04m

1 stop

SJU2:53 amSan Juan Luis Munoz Marin Intl

Mar 11

SJU3:19 pmSan Juan Luis Munoz Marin Intl

9h 00m

1 stop

STL11:19 pmLambert-St Louis

$209

American Airlines flights from St. Louis to Puerto Rico

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

American Airlines

Mar 3

STL10:20 amLambert-St Louis

9h 14m

2 stops

SJU9:34 pmSan Juan Luis Munoz Marin Intl

Mar 6

SJU5:02 pmSan Juan Luis Munoz Marin Intl

7h 50m

1 stop

STL10:52 pmLambert-St Louis

$246

American Airlines

Mar 31

STL5:14 amLambert-St Louis

10h 57m

1 stop

SJU5:11 pmSan Juan Luis Munoz Marin Intl

Apr 7

SJU7:00 pmSan Juan Luis Munoz Marin Intl

16h 16m

1 stop

STL10:16 amLambert-St Louis

$256

American Airlines

Feb 25

STL7:05 amLambert-St Louis

9h 04m

2 stops

SJU6:09 pmSan Juan Luis Munoz Marin Intl

Mar 4

SJU8:00 amSan Juan Luis Munoz Marin Intl

10h 58m

2 stops

STL4:58 pmLambert-St Louis

$376

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

man. 2/23

3:49 pm-12:43 am

1 stop6h 54m

San Juan Luis Munoz Marin Intl

ons. 3/4

5:25 pm-10:27 pm

1 stop7h 02m

$188

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

lør. 5/9

4:55 pm-2:01 am

1 stop8h 06m

San Juan Luis Munoz Marin Intl

ons. 5/13

3:19 pm-11:19 pm

1 stop9h 00m

$202

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

tir. 3/3

3:49 pm-2:53 am

1 stop9h 04m

San Juan Luis Munoz Marin Intl

ons. 3/11

3:19 pm-11:19 pm

1 stop9h 00m

$209

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

søn. 3/1

3:49 pm-2:53 am

1 stop9h 04m

San Juan Luis Munoz Marin Intl

lør. 3/7

5:55 pm-5:57 am

1 stop14h 02m

$211

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

søn. 5/3

4:55 pm-9:54 am

1 stop15h 59m

San Juan Luis Munoz Marin Intl

tir. 5/12

6:30 am-11:19 pm

1 stop17h 49m

$213

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

man. 2/23

8:22 pm-2:22 pm

1 stop16h 00m

San Juan Luis Munoz Marin Intl

tir. 3/3

2:59 am-10:27 pm

2 stops21h 28m

$220

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

tir. 3/10

4:51 pm-8:54 am

1 stop15h 03m

San Juan Luis Munoz Marin Intl

tir. 3/17

6:30 am-7:37 am

1 stop26h 07m

$221

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

man. 3/2

3:49 pm-2:53 am

1 stop9h 04m

San Juan Luis Munoz Marin Intl

tir. 3/10

11:07 am-11:19 pm

1 stop13h 12m

$223

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

tir. 3/3

3:49 pm-9:54 am

1 stop16h 05m

San Juan Luis Munoz Marin Intl

søn. 3/8

5:30 am-8:10 pm

1 stop15h 40m

$225

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

ons. 2/25

8:17 pm-6:58 pm

2 stops20h 41m

San Juan Luis Munoz Marin Intl

fre. 2/27

4:16 pm-6:51 am

1 stop16h 35m

$227

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 $359.

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 $435 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 $316 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 February 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 MAX 8 (40.00% of total bookings). The next most popular plane models are Boeing 737-700 Passenger/BBJ1 (winglets) (40.00%) and Boeing 737-800 Passenger/BBJ2 (winglets) (20.00%).

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 $137	Free Cancellation	Rating 5.7 3,052 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $146	Free Cancellation	Rating 6.3 8,451 reviews	Search Spirit Airlines flights
Delta	PriceFrom $180	Free Cancellation	Rating 7.9 8,191 reviews	Search Delta flights
Southwest	PriceFrom $219	Free Cancellation	Rating 8.0 4,283 reviews	Search Southwest flights
United Airlines	PriceFrom $225	Free Cancellation	Rating 7.4 9,286 reviews	Search United Airlines flights
American Airlines	PriceFrom $238	Free Cancellation	Rating 7.2 11,277 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

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.

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Popular cities in Puerto Rico

Flights to San Juanfrom $55

Flights to Aguadillafrom $137

Flights to Mayagüezfrom $304

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 3/3. 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 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?

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

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

How can momondo help me find flights 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?

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

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

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