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Cheap flights from St. Louis to Puerto Rico from $103

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 10/29. 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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Find the cheapest flights from St. Louis to Puerto Rico

Cheap round-trip flights

Southwest Logo
3:25 pm - 11:50 pmSTL-SJU
7h 25m1 stop
Southwest Logo
5:45 am - 5:05 pmSJU-STL
12h 20m1 stop
$205Southwest
Find Deal
Tue, Oct 21 - Sat, Oct 25
Delta Logo
1:26 pm - 10:00 pmSTL-SJU
7h 34m1 stop
Delta Logo
12:58 pm - 11:24 pmSJU-STL
11h 26m1 stop
$215Delta
Find Deal
Mon, Sep 15 - Fri, Sep 19
Frontier Logo
5:40 pm - 9:04 amSTL-SJU
14h 24m1 stop
Frontier Logo
9:30 pm - 11:47 pmSJU-STL
27h 17m1 stop
$239Frontier
Find Deal
Wed, Aug 13 - Sat, Aug 16
Frontier Logo
5:40 pm - 2:39 amSTL-SJU
7h 59m1 stop
Frontier Logo
8:23 pm - 1:07 pmSJU-STL
17h 44m1 stop
$245Frontier
Find Deal
Tue, Aug 12 - Sat, Aug 23
United Airlines Logo
10:30 am - 10:22 pmSTL-SJU
9h 52m2 stops
United Airlines Logo
8:35 am - 2:18 pmSJU-STL
7h 43m1 stop
$246United Airlines
Find Deal
Wed, Jan 21 - Sat, Jan 24
Delta Logo
9:19 am - 4:31 pmSTL-SJU
6h 12m1 stop
Delta Logo
7:30 am - 5:47 pmSJU-STL
11h 17m1 stop
$255Delta
Find Deal
Mon, Sep 22 - Sun, Sep 28
Southwest Logo
11:10 am - 10:30 pmSTL-SJU
10h 20m2 stops
Southwest Logo
3:05 pm - 9:55 pmSJU-STL
7h 50m1 stop
$260Southwest
Find Deal
Wed, Sep 17 - Wed, Sep 24
United Airlines Logo
6:15 am - 3:42 pmSTL-SJU
8h 27m1 stop
United Airlines Logo
1:05 am - 2:27 pmSJU-STL
14h 22m2 stops
$286United Airlines
Find Deal
Sat, Sep 20 - Fri, Oct 24
American Airlines Logo
6:00 am - 10:49 pmSTL-SJU
15h 49m1 stop
American Airlines Logo
8:30 am - 8:47 pmSJU-STL
13h 17m1 stop
$300American Airlines
Find Deal
Fri, Aug 22 - Fri, Aug 29
American Airlines Logo
6:00 am - 11:59 pmSTL-SJU
16h 59m1 stop
American Airlines Logo
5:30 am - 4:03 pmSJU-STL
11h 33m1 stop
$307American Airlines
Find Deal
Fri, Oct 17 - Sun, Oct 19

Southwest flights from St. Louis to Puerto Rico

Our best Southwest deals on St. Louis to Puerto Rico flight tickets
Southwest
Oct 21
STL3:25 pmLambert-St Louis
7h 25m
1 stop
SJU11:50 pmSan Juan Luis Munoz Marin Intl
Oct 25
SJU5:45 amSan Juan Luis Munoz Marin Intl
12h 20m
1 stop
STL5:05 pmLambert-St Louis
$205
Find similar
Southwest
Sep 17
STL11:10 amLambert-St Louis
10h 20m
2 stops
SJU10:30 pmSan Juan Luis Munoz Marin Intl
Sep 24
SJU3:05 pmSan Juan Luis Munoz Marin Intl
7h 50m
1 stop
STL9:55 pmLambert-St Louis
$260
Find similar

Frontier flights from St. Louis to Puerto Rico

Our best Frontier deals on St. Louis to Puerto Rico flight tickets
Frontier
Aug 13
STL5:40 pmLambert-St Louis
14h 24m
1 stop
SJU9:04 amSan Juan Luis Munoz Marin Intl
Aug 16
SJU9:30 pmSan Juan Luis Munoz Marin Intl
27h 17m
1 stop
STL11:47 pmLambert-St Louis
$239
Find similar
Frontier
Aug 12
STL5:40 pmLambert-St Louis
7h 59m
1 stop
SJU2:39 amSan Juan Luis Munoz Marin Intl
Aug 23
SJU8:23 pmSan Juan Luis Munoz Marin Intl
17h 44m
1 stop
STL1:07 pmLambert-St Louis
$245
Find similar
Frontier
Nov 1
STL5:48 pmLambert-St Louis
20h 49m
1 stop
SJU3:37 pmSan Juan Luis Munoz Marin Intl
Nov 8
SJU8:03 amSan Juan Luis Munoz Marin Intl
10h 50m
1 stop
STL4:53 pmLambert-St Louis
$250
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 July 31, 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

Tue 10/21

3:25 pm-11:50 pm

1 stop7h 25m

San Juan Luis Munoz Marin Intl

Sat 10/25

5:45 am-5:05 pm

1 stop12h 20m

$205

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Mon 9/15

1:26 pm-10:00 pm

1 stop7h 34m

San Juan Luis Munoz Marin Intl

Fri 9/19

12:58 pm-11:24 pm

1 stop11h 26m

$215

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 8/13

5:40 pm-9:04 am

1 stop14h 24m

San Juan Luis Munoz Marin Intl

Sat 8/16

9:30 pm-11:47 pm

1 stop27h 17m

$239

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Tue 8/12

5:40 pm-2:39 am

1 stop7h 59m

San Juan Luis Munoz Marin Intl

Sat 8/23

8:23 pm-1:07 pm

1 stop17h 44m

$245

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 1/21

10:30 am-10:22 pm

2 stops9h 52m

San Juan Luis Munoz Marin Intl

Sat 1/24

8:35 am-2:18 pm

1 stop7h 43m

$246

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Mon 9/22

9:19 am-4:31 pm

1 stop6h 12m

San Juan Luis Munoz Marin Intl

Sun 9/28

7:30 am-5:47 pm

1 stop11h 17m

$255

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 9/17

11:10 am-10:30 pm

2 stops10h 20m

San Juan Luis Munoz Marin Intl

Wed 9/24

3:05 pm-9:55 pm

1 stop7h 50m

$260

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 9/20

6:15 am-3:42 pm

1 stop8h 27m

San Juan Luis Munoz Marin Intl

Fri 10/24

1:05 am-2:27 pm

2 stops14h 22m

$286

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 8/22

6:00 am-10:49 pm

1 stop15h 49m

San Juan Luis Munoz Marin Intl

Fri 8/29

8:30 am-8:47 pm

1 stop13h 17m

$300

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 10/17

6:00 am-11:59 pm

1 stop16h 59m

San Juan Luis Munoz Marin Intl

Sun 10/19

5:30 am-4:03 pm

1 stop11h 33m

$307

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 $369.

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 $641.

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 $305 on momondo.

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

There are 1 cabin classes 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

Best Price Found

$103

Fastest flight time

6h 12m

Direct flights

Sun

Airports in Puerto Rico

2 airports
The best one-way flight to Puerto Rico from St. Louis in the past 72 hours is $103. The best round-trip flight deal from St. Louis to Puerto Rico found on momondo in the last 72 hours is $205.
The fastest flight from St. Louis to Puerto Rico takes 6h 12m
Direct flights go from St. Louis to Puerto Rico on Sunday. The only airline offering direct flights is Southwest.
There are 2 airports near Puerto Rico: Culebra (CPX), 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
5.9
3,238 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $155Free CancellationRating
6.3
8,047 reviews
Search Spirit Airlines flights
DeltaPriceFrom $218Free CancellationRating
8.0
7,980 reviews
Search Delta flights
United AirlinesPriceFrom $219Free CancellationRating
7.4
8,902 reviews
Search United Airlines flights
SouthwestPriceFrom $219Free CancellationRating
8.0
4,244 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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