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Cheap flights from St. Louis to Puerto Rico from $113

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 10/21. 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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0 bags

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Find the cheapest flights from St. Louis to Puerto Rico

Cheap round-trip flights

American Airlines Logo
9:14 am - 11:54 pmSTL-SJU
13h 40m1 stop
American Airlines Logo
3:00 pm - 11:54 pmSJU-STL
9h 54m1 stop
$225American Airlines
Find Deal
Sat, Oct 18 - Wed, Oct 22
American Airlines Logo
8:30 am - 10:10 pmSTL-SJU
12h 40m1 stop
American Airlines Logo
3:00 pm - 11:54 pmSJU-STL
9h 54m1 stop
$231American Airlines
Find Deal
Wed, Oct 15 - Wed, Oct 22
Frontier Logo
4:13 pm - 2:54 amSTL-SJU
8h 41m1 stop
Frontier Logo
11:05 am - 10:46 pmSJU-STL
13h 41m1 stop
$268Frontier
Find Deal
Thu, Nov 27 - Fri, Dec 5
Delta Logo
6:00 am - 3:11 pmSTL-SJU
7h 11m1 stop
Delta Logo
7:00 am - 4:07 pmSJU-STL
11h 07m1 stop
$269Delta
Find Deal
Sat, Nov 8 - Wed, Nov 12
Frontier Logo
6:42 pm - 12:00 pmSTL-SJU
16h 18m1 stop
Frontier Logo
3:40 am - 5:10 pmSJU-STL
14h 30m1 stop
$276Frontier
Find Deal
Fri, Oct 24 - Sun, Oct 26
Frontier Logo
6:05 pm - 2:30 amSTL-SJU
7h 25m1 stop
Frontier Logo
3:40 am - 5:10 pmSJU-STL
14h 30m1 stop
$290Frontier
Find Deal
Fri, Oct 10 - Thu, Oct 16
United Airlines Logo
10:00 am - 9:00 pmSTL-SJU
9h 00m1 stop
United Airlines Logo
8:10 am - 2:25 pmSJU-STL
8h 15m1 stop
$315United Airlines
Find Deal
Tue, Nov 4 - Fri, Nov 14
Delta Logo
6:00 am - 3:11 pmSTL-SJU
7h 11m1 stop
Delta Logo
4:50 pm - 11:22 pmSJU-STL
8h 32m1 stop
$320Delta
Find Deal
Sat, Nov 8 - Sat, Nov 15
United Airlines Logo
9:20 am - 11:57 pmSTL-SJU
13h 37m2 stops
United Airlines Logo
1:05 am - 10:49 amSJU-STL
10h 44m2 stops
$334United Airlines
Find Deal
Sat, Oct 18 - Tue, Oct 21
Southwest Logo
3:45 pm - 12:35 amSTL-SJU
6h 50m1 stop
Southwest Logo
8:50 am - 12:00 pmSJU-STL
5h 10mnonstop
$371Southwest
Find Deal
Fri, Nov 7 - Sat, Nov 8

Delta flights from St. Louis to Puerto Rico

Our best Delta deals on St. Louis to Puerto Rico flight tickets
Delta
Nov 8
STL6:00 amLambert-St Louis
7h 11m
1 stop
SJU3:11 pmSan Juan Luis Munoz Marin Intl
Nov 12
SJU7:00 amSan Juan Luis Munoz Marin Intl
11h 07m
1 stop
STL4:07 pmLambert-St Louis
$269
Find similar
Delta
Nov 8
STL6:00 amLambert-St Louis
7h 11m
1 stop
SJU3:11 pmSan Juan Luis Munoz Marin Intl
Nov 15
SJU4:50 pmSan Juan Luis Munoz Marin Intl
8h 32m
1 stop
STL11:22 pmLambert-St Louis
$320
Find similar
Delta
Nov 8
STL10:30 amLambert-St Louis
10h 29m
1 stop
SJU10:59 pmSan Juan Luis Munoz Marin Intl
Nov 14
SJU3:20 pmSan Juan Luis Munoz Marin Intl
7h 26m
1 stop
STL8:46 pmLambert-St Louis
$355
Find similar

United Airlines flights from St. Louis to Puerto Rico

Our best United Airlines deals on St. Louis to Puerto Rico flight tickets
United Airlines
Nov 4
STL10:00 amLambert-St Louis
9h 00m
1 stop
SJU9:00 pmSan Juan Luis Munoz Marin Intl
Nov 14
SJU8:10 amSan Juan Luis Munoz Marin Intl
8h 15m
1 stop
STL2:25 pmLambert-St Louis
$315
Find similar
United Airlines
Oct 18
STL9:20 amLambert-St Louis
13h 37m
2 stops
SJU11:57 pmSan Juan Luis Munoz Marin Intl
Oct 21
SJU1:05 amSan Juan Luis Munoz Marin Intl
10h 44m
2 stops
STL10:49 amLambert-St Louis
$334
Find similar
United Airlines
Nov 4
STL10:00 amLambert-St Louis
10h 22m
2 stops
SJU10:22 pmSan Juan Luis Munoz Marin Intl
Nov 13
SJU2:05 amSan Juan Luis Munoz Marin Intl
14h 20m
2 stops
STL2:25 pmLambert-St Louis
$359
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Puerto Rico that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated September 17, 2025.
Use the filters below to find and compare flights from St. Louis to Puerto Rico that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 10/18

9:14 am-11:54 pm

1 stop13h 40m

San Juan Luis Munoz Marin Intl

Wed 10/22

3:00 pm-11:54 pm

1 stop9h 54m

$225

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 10/15

8:30 am-10:10 pm

1 stop12h 40m

San Juan Luis Munoz Marin Intl

Wed 10/22

3:00 pm-11:54 pm

1 stop9h 54m

$231

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Thu 11/27

4:13 pm-2:54 am

1 stop8h 41m

San Juan Luis Munoz Marin Intl

Fri 12/5

11:05 am-10:46 pm

1 stop13h 41m

$268

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 11/8

6:00 am-3:11 pm

1 stop7h 11m

San Juan Luis Munoz Marin Intl

Wed 11/12

7:00 am-4:07 pm

1 stop11h 07m

$269

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 10/24

6:42 pm-12:00 pm

1 stop16h 18m

San Juan Luis Munoz Marin Intl

Sun 10/26

3:40 am-5:10 pm

1 stop14h 30m

$276

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 10/10

6:05 pm-2:30 am

1 stop7h 25m

San Juan Luis Munoz Marin Intl

Thu 10/16

3:40 am-5:10 pm

1 stop14h 30m

$290

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Tue 11/4

10:00 am-9:00 pm

1 stop9h 00m

San Juan Luis Munoz Marin Intl

Fri 11/14

8:10 am-2:25 pm

1 stop8h 15m

$315

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 11/8

6:00 am-3:11 pm

1 stop7h 11m

San Juan Luis Munoz Marin Intl

Sat 11/15

4:50 pm-11:22 pm

1 stop8h 32m

$320

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 10/18

9:20 am-11:57 pm

2 stops13h 37m

San Juan Luis Munoz Marin Intl

Tue 10/21

1:05 am-10:49 am

2 stops10h 44m

$334

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 11/7

3:45 pm-12:35 am

1 stop6h 50m

San Juan Luis Munoz Marin Intl

Sat 11/8

8:50 am-12:00 pm

Nonstop5h 10m

$371

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Puerto Rico from

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

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 $368.

What is the cheapest day to depart on your flight to Puerto Rico?

On average, the least expensive day to fly to Puerto Rico from St. Louis is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as $404. However, this price may fluctuate depending on the airline, the season, and holidays. The most expensive day to fly to Puerto Rico is Saturday, with ticket prices averaging around $636.

What is the cheapest time of day to depart on your flight to Puerto Rico?

Our most recent data shows that the best time of day to fly to Puerto Rico is in the evening. Flights from St. Louis to Puerto Rico during this time can be as low as $310. In contrast, the most expensive time of day to depart to Puerto Rico is at noon when prices are around $660.

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 $448 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 $331 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 15m

Direct flights

Sun

Airports in Puerto Rico

1 airport
The fastest flight from St. Louis to Puerto Rico takes 4h 15m
Direct flights go from St. Louis to Puerto Rico on Sunday. There are no airlines offering direct flights.
There is 1 airport near Puerto Rico: 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?

  • 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?

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
FrontierPriceFrom $140Free CancellationRating
5.8
3,173 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $170Free CancellationRating
6.3
8,023 reviews
Search Spirit Airlines flights
DeltaPriceFrom $209Free CancellationRating
7.9
7,961 reviews
Search Delta flights
United AirlinesPriceFrom $219Free CancellationRating
7.4
8,926 reviews
Search United Airlines flights
SouthwestPriceFrom $219Free CancellationRating
8.0
4,242 reviews
Search Southwest flights
American AirlinesPriceFrom $255Free CancellationRating
7.2
10,000 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.

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Find better results for your trip to Puerto Rico

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