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Cheap flights from Puerto Rico to St. Louis from $108

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Puerto Rico to St. Louis departing on 12/6. 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 Puerto Rico to St. Louis

Recent round-trip flight deals from Puerto Rico to St. Louis

Enter your travel dates to find the best prices.
United Airlines Logo
8:35 am - 2:30 pmSJU-STL
7h 55m1 stop
United Airlines Logo
9:57 am - 10:22 pmSTL-SJU
10h 25m2 stops
$225United Airlines
Find Deal
Thu, Jan 22 - Tue, Feb 3
American Airlines Logo
4:45 pm - 9:35 amSJU-STL
17h 50m1 stop
American Airlines Logo
6:00 am - 11:52 pmSTL-SJU
15h 52m1 stop
$229American Airlines
Find Deal
Wed, Oct 29 - Mon, Nov 3
American Airlines Logo
5:30 am - 8:20 pmSJU-STL
15h 50m1 stop
American Airlines Logo
6:00 am - 2:53 pmSTL-SJU
6h 53m1 stop
$230American Airlines
Find Deal
Wed, Oct 29 - Mon, Nov 3
Frontier Logo
3:55 am - 10:33 pmSJU-STL
20h 38m1 stop
Frontier Logo
5:11 pm - 2:50 amSTL-SJU
7h 39m1 stop
$243Frontier
Find Deal
Thu, Jan 22 - Tue, Feb 3
Frontier Logo
4:16 pm - 6:02 pmSJU-STL
26h 46m1 stop
Frontier Logo
1:41 pm - 9:42 amSTL-SJU
19h 01m1 stop
$278Frontier
Find Deal
Fri, Oct 24 - Sun, Oct 26
Frontier Logo
9:37 pm - 7:50 amSJU-STL
12h 13m1 stop
Frontier Logo
5:11 pm - 2:50 amSTL-SJU
7h 39m1 stop
$281Frontier
Find Deal
Thu, Feb 19 - Mon, Feb 23
Southwest Logo
12:10 pm - 8:35 pmSJU-STL
10h 25m2 stops
Southwest Logo
8:15 am - 7:05 pmSTL-SJU
8h 50m2 stops
$407Southwest
Find Deal
Thu, Jan 22 - Tue, Feb 3
Multiple Airlines Logo
6:00 am - 5:43 pmSJU-STL
13h 43m1 stop
Multiple Airlines Logo
7:43 pm - 9:55 amSTL-SJU
36h 12m2 stops
$429Multiple Airlines
Find Deal
Sun, Nov 23 - Wed, Dec 3
Multiple Airlines Logo
6:01 am - 6:13 pmSJU-STL
14h 12m2 stops
Multiple Airlines Logo
5:11 pm - 10:49 amSTL-SJU
15h 38m1 stop
$471Multiple Airlines
Find Deal
Mon, Nov 24 - Tue, Dec 2
Delta Logo
3:30 pm - 11:07 pmSJU-STL
8h 37m1 stop
Delta Logo
7:05 am - 4:33 pmSTL-SJU
8h 28m1 stop
$485Delta
Find Deal
Sat, Oct 18 - Tue, Oct 21

United Airlines flights from Puerto Rico to St. Louis

Our best United Airlines deals on Puerto Rico to St. Louis flight tickets
United Airlines
Jan 22
SJU8:35 amSan Juan Luis Munoz Marin Intl
7h 55m
1 stop
STL2:30 pmLambert-St Louis
Feb 3
STL9:57 amLambert-St Louis
10h 25m
2 stops
SJU10:22 pmSan Juan Luis Munoz Marin Intl
$225
Find similar
United Airlines
Jan 21
SJU2:05 amSan Juan Luis Munoz Marin Intl
10h 36m
1 stop
STL10:41 amLambert-St Louis
Feb 2
STL11:20 amLambert-St Louis
11h 16m
2 stops
SJU12:36 amSan Juan Luis Munoz Marin Intl
$315
Find similar
United Airlines
Oct 28
SJU1:05 amSan Juan Luis Munoz Marin Intl
14h 20m
2 stops
STL2:25 pmLambert-St Louis
Nov 3
STL10:00 amLambert-St Louis
9h 00m
1 stop
SJU9:00 pmSan Juan Luis Munoz Marin Intl
$359
Find similar

American Airlines flights from Puerto Rico to St. Louis

Our best American Airlines deals on Puerto Rico to St. Louis flight tickets
American Airlines
Oct 29
SJU4:45 pmSan Juan Luis Munoz Marin Intl
17h 50m
1 stop
STL9:35 amLambert-St Louis
Nov 3
STL6:00 amLambert-St Louis
15h 52m
1 stop
SJU11:52 pmSan Juan Luis Munoz Marin Intl
$229
Find similar
American Airlines
Oct 29
SJU5:30 amSan Juan Luis Munoz Marin Intl
15h 50m
1 stop
STL8:20 pmLambert-St Louis
Nov 3
STL6:00 amLambert-St Louis
6h 53m
1 stop
SJU2:53 pmSan Juan Luis Munoz Marin Intl
$230
Find similar
American Airlines
Feb 19
SJU5:41 amSan Juan Luis Munoz Marin Intl
17h 59m
1 stop
STL9:40 pmLambert-St Louis
Feb 23
STL4:44 pmLambert-St Louis
17h 01m
2 stops
SJU11:45 amSan Juan Luis Munoz Marin Intl
$285
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Puerto Rico to St. Louis 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 October 5, 2025.
Use the filters below to find and compare flights from Puerto Rico to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Thu 1/22

8:35 am-2:30 pm

1 stop7h 55m

Lambert-St Louis

Tue 2/3

9:57 am-10:22 pm

2 stops10h 25m

$225

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Wed 10/29

4:45 pm-9:35 am

1 stop17h 50m

Lambert-St Louis

Mon 11/3

6:00 am-11:52 pm

1 stop15h 52m

$229

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Wed 10/29

5:30 am-8:20 pm

1 stop15h 50m

Lambert-St Louis

Mon 11/3

6:00 am-2:53 pm

1 stop6h 53m

$230

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Thu 1/22

3:55 am-10:33 pm

1 stop20h 38m

Lambert-St Louis

Tue 2/3

5:11 pm-2:50 am

1 stop7h 39m

$243

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Fri 10/24

4:16 pm-6:02 pm

1 stop26h 46m

Lambert-St Louis

Sun 10/26

1:41 pm-9:42 am

1 stop19h 01m

$278

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Thu 2/19

9:37 pm-7:50 am

1 stop12h 13m

Lambert-St Louis

Mon 2/23

5:11 pm-2:50 am

1 stop7h 39m

$281

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Thu 1/22

12:10 pm-8:35 pm

2 stops10h 25m

Lambert-St Louis

Tue 2/3

8:15 am-7:05 pm

2 stops8h 50m

$407

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Sun 11/23

6:00 am-5:43 pm

1 stop13h 43m

Lambert-St Louis

Wed 12/3

7:43 pm-9:55 am

2 stops36h 12m

$429

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Mon 11/24

6:01 am-6:13 pm

2 stops14h 12m

Lambert-St Louis

Tue 12/2

5:11 pm-10:49 am

1 stop15h 38m

$471

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Sat 10/18

3:30 pm-11:07 pm

1 stop8h 37m

Lambert-St Louis

Tue 10/21

7:05 am-4:33 pm

1 stop8h 28m

$485

Flights are sorted by cheapest round-trip flights first.

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See travel insights to St. Louis from

How to get the cheapest flight ticket from Puerto Rico to St. Louis

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 St. Louis?

In general, January is the cheapest month to fly from Puerto Rico to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $286. The month of September is another great option to travel to St. Louis, with average flight prices from Puerto Rico averaging around $300.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Tuesday when prices can be found for as low as $349. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $640. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Puerto Rico in the evening is the least expensive time of day to depart. momondo users have found prices as low as $282 when looking at flights departing in the evening. In the afternoon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $640 per ticket.

What is the cheapest Puerto Rico to Lambert-St Louis flight route?

Fly from San Juan Luis Munoz Marin Intl to Lambert-St Louis for the best Puerto Rico - Lambert-St Louis flight prices

How far in advance should I book a flight to St. Louis?

You are more likely to see cheaper flights to St. Louis from Puerto Rico when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $393 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Puerto Rico for as low as $245 on momondo.

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

There is only 1 cabin class available to choose from on Puerto Rico to Lambert-St Louis 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 Puerto Rico to St. Louis flights?

No. A direct flight is the cheapest option for a flight between Puerto Rico to St. Louis.

Cheap Puerto Rico to St. Louis flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Puerto Rico to St. Louis

Fastest flight time

5h 10m

Direct flights

Sun

Airports in St. Louis

1 airport
The fastest flight from Puerto Rico to St. Louis takes 5h 10m
Direct flights go from Puerto Rico to St. Louis on Sunday. The only airline offering direct flights is Southwest.
There is 1 airport near St. Louis: Lambert-St Louis (STL)
Search flight deals

  • When did momondo last update prices for flights from Puerto Rico to Lambert-St Louis Airport?

    Prices for flights from Puerto Rico to Lambert-St Louis Airport refresh daily.

  • How many operators does momondo search for flights from Puerto Rico to Lambert-St Louis Airport?

  • How old do you have to be to fly from Puerto Rico to Lambert-St Louis Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Puerto Rico to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The travel and health documents you'll need for your trip to Lambert-St Louis Airport 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 Lambert-St Louis Airport. 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 Puerto Rico to St. Louis?

Best airlines flying from Puerto Rico to St. Louis

Compare and see reviews for airlines that fly from Puerto Rico to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $128Free CancellationRating
5.8
3,154 reviews
Search Frontier flights
DeltaPriceFrom $212Free CancellationRating
7.9
7,970 reviews
Search Delta flights
American AirlinesPriceFrom $254Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $255Free CancellationRating
7.4
8,946 reviews
Search United Airlines flights
SouthwestPriceFrom $342Free CancellationRating
8.0
4,237 reviews
Search Southwest flights

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Florissant
Maryland Heights
O'Fallon
Collinsville
Fenton
Wentzville
St. Peters
Alton
Farmington
Festus
Glencoe
Clayton
Edwardsville
Eureka
Litchfield
Shrewsbury

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Puerto Rico to St. Louis. Millions of users trust and use momondo every year so you are in good hands.

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

Yes. All flights to St. Louis from Puerto Rico on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Puerto Rico to St. Louis?

Once all potential Puerto Rico to St. Louis flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Puerto Rico to St. Louis right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Puerto Rico to St. Louis flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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