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Cheap flights from St. Louis to Puerto Rico from $69

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 1/9. 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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Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
8:45 am - 9:55 amSTL-SJU
23h 10m1 stop
Frontier Logo
3:55 am - 10:33 pmSJU-STL
20h 38m1 stop
$138Frontier
Find Deal
Mon, Jan 26 - Thu, Jan 29
Frontier Logo
5:11 pm - 2:50 amSTL-SJU
7h 39m1 stop
Frontier Logo
5:15 pm - 10:37 pmSJU-STL
7h 22m1 stop
$153Frontier
Find Deal
Wed, Jan 7 - Tue, Jan 13
Delta Logo
9:00 am - 8:06 pmSTL-SJU
10h 06m1 stop
Delta Logo
6:15 am - 12:54 pmSJU-STL
7h 39m1 stop
$225Delta
Find Deal
Sun, May 3 - Wed, May 6
United Airlines Logo
11:20 am - 9:00 pmSTL-SJU
7h 40m1 stop
United Airlines Logo
2:05 am - 12:29 pmSJU-STL
12h 24m2 stops
$248United Airlines
Find Deal
Wed, Jan 21 - Mon, Jan 26
United Airlines Logo
9:57 am - 10:22 pmSTL-SJU
10h 25m2 stops
United Airlines Logo
2:05 am - 10:41 amSJU-STL
10h 36m1 stop
$257United Airlines
Find Deal
Mon, Jan 26 - Fri, Jan 30
Southwest Logo
2:15 pm - 12:35 amSTL-SJU
8h 20m2 stops
Southwest Logo
5:45 am - 1:15 pmSJU-STL
9h 30m1 stop
$264Southwest
Find Deal
Tue, Dec 2 - Tue, Dec 9
American Airlines Logo
9:33 am - 11:56 pmSTL-SJU
12h 23m1 stop
American Airlines Logo
6:00 am - 3:04 pmSJU-STL
11h 04m2 stops
$290American Airlines
Find Deal
Mon, Jan 19 - Tue, Jan 20
American Airlines Logo
6:00 am - 4:09 pmSTL-SJU
8h 09m1 stop
American Airlines Logo
7:00 am - 10:05 pmSJU-STL
17h 05m1 stop
$295American Airlines
Find Deal
Wed, Feb 18 - Wed, Feb 25
Southwest Logo
2:05 pm - 11:25 pmSTL-SJU
7h 20m1 stop
Southwest Logo
6:40 pm - 8:15 amSJU-STL
15h 35m2 stops
$303Southwest
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Sun, Mar 1 - Sat, Mar 7
Delta Logo
7:30 am - 7:29 pmSTL-SJU
10h 59m1 stop
Delta Logo
1:10 pm - 11:40 pmSJU-STL
11h 30m1 stop
$345Delta
Find Deal
Mon, Mar 23 - Tue, Mar 31

Frontier flights from St. Louis to Puerto Rico

Our best Frontier deals on St. Louis to Puerto Rico flight tickets
Frontier
Jan 26
STL8:45 amLambert-St Louis
23h 10m
1 stop
SJU9:55 amSan Juan Luis Munoz Marin Intl
Jan 29
SJU3:55 amSan Juan Luis Munoz Marin Intl
20h 38m
1 stop
STL10:33 pmLambert-St Louis
$138
Find similar
Frontier
Jan 7
STL5:11 pmLambert-St Louis
7h 39m
1 stop
SJU2:50 amSan Juan Luis Munoz Marin Intl
Jan 13
SJU5:15 pmSan Juan Luis Munoz Marin Intl
7h 22m
1 stop
STL10:37 pmLambert-St Louis
$153
Find similar
Frontier
Feb 20
STL5:11 pmLambert-St Louis
7h 39m
1 stop
SJU2:50 amSan Juan Luis Munoz Marin Intl
Feb 27
SJU11:05 amSan Juan Luis Munoz Marin Intl
13h 28m
1 stop
STL10:33 pmLambert-St Louis
$168
Find similar

American Airlines flights from St. Louis to Puerto Rico

Our best American Airlines deals on St. Louis to Puerto Rico flight tickets
American Airlines
Jan 19
STL9:33 amLambert-St Louis
12h 23m
1 stop
SJU11:56 pmSan Juan Luis Munoz Marin Intl
Jan 20
SJU6:00 amSan Juan Luis Munoz Marin Intl
11h 04m
2 stops
STL3:04 pmLambert-St Louis
$290
Find similar
American Airlines
Feb 18
STL6:00 amLambert-St Louis
8h 09m
1 stop
SJU4:09 pmSan Juan Luis Munoz Marin Intl
Feb 25
SJU7:00 amSan Juan Luis Munoz Marin Intl
17h 05m
1 stop
STL10:05 pmLambert-St Louis
$295
Find similar
American Airlines
Dec 2
STL5:15 amLambert-St Louis
8h 51m
1 stop
SJU4:06 pmSan Juan Luis Munoz Marin Intl
Dec 9
SJU12:49 pmSan Juan Luis Munoz Marin Intl
10h 58m
2 stops
STL9:47 pmLambert-St Louis
$298
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 November 5, 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

Mon 1/26

8:45 am-9:55 am

1 stop23h 10m

San Juan Luis Munoz Marin Intl

Thu 1/29

3:55 am-10:33 pm

1 stop20h 38m

$138

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 1/7

5:11 pm-2:50 am

1 stop7h 39m

San Juan Luis Munoz Marin Intl

Tue 1/13

5:15 pm-10:37 pm

1 stop7h 22m

$153

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sun 5/3

9:00 am-8:06 pm

1 stop10h 06m

San Juan Luis Munoz Marin Intl

Wed 5/6

6:15 am-12:54 pm

1 stop7h 39m

$225

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 1/21

11:20 am-9:00 pm

1 stop7h 40m

San Juan Luis Munoz Marin Intl

Mon 1/26

2:05 am-12:29 pm

2 stops12h 24m

$248

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Mon 1/26

9:57 am-10:22 pm

2 stops10h 25m

San Juan Luis Munoz Marin Intl

Fri 1/30

2:05 am-10:41 am

1 stop10h 36m

$257

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Tue 12/2

2:15 pm-12:35 am

2 stops8h 20m

San Juan Luis Munoz Marin Intl

Tue 12/9

5:45 am-1:15 pm

1 stop9h 30m

$264

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Mon 1/19

9:33 am-11:56 pm

1 stop12h 23m

San Juan Luis Munoz Marin Intl

Tue 1/20

6:00 am-3:04 pm

2 stops11h 04m

$290

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 2/18

6:00 am-4:09 pm

1 stop8h 09m

San Juan Luis Munoz Marin Intl

Wed 2/25

7:00 am-10:05 pm

1 stop17h 05m

$295

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sun 3/1

2:05 pm-11:25 pm

1 stop7h 20m

San Juan Luis Munoz Marin Intl

Sat 3/7

6:40 pm-8:15 am

2 stops15h 35m

$303

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Mon 3/23

7:30 am-7:29 pm

1 stop10h 59m

San Juan Luis Munoz Marin Intl

Tue 3/31

1:10 pm-11:40 pm

1 stop11h 30m

$345

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 $371.

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 $646.

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 $450 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 $314 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)
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  • 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
3,115 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $170Free CancellationRating
6.3
8,113 reviews
Search Spirit Airlines flights
DeltaPriceFrom $206Free CancellationRating
7.9
8,004 reviews
Search Delta flights
SouthwestPriceFrom $219Free CancellationRating
8.0
4,239 reviews
Search Southwest flights
United AirlinesPriceFrom $225Free CancellationRating
7.4
9,001 reviews
Search United Airlines flights
American AirlinesPriceFrom $258Free CancellationRating
7.2
11,039 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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