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Cheap flights from Puerto Rico to St. Louis from $84

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 2/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
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.
Frontier Logo
4:36 pm - 11:33 pm
SJU
-
STL
8h 57m1 stop
Frontier Logo
10:16 am - 11:59 pm
STL
-
SJU
11h 43m1 stop
$180Frontier
Thu, Jan 29 - Mon, Feb 2
Frontier Logo
4:06 pm - 10:34 pm
SJU
-
STL
8h 28m1 stop
Frontier Logo
5:11 pm - 2:48 am
STL
-
SJU
7h 37m1 stop
$199Frontier
Thu, Jan 15 - Mon, Jan 19
United Airlines Logo
8:10 am - 5:43 pm
SJU
-
STL
11h 33m2 stops
United Airlines Logo
6:00 am - 4:36 pm
STL
-
SJU
8h 36m1 stop
$225United Airlines
Sat, Jan 17 - Wed, Jan 21
American Airlines Logo
7:07 am - 10:55 pm
SJU
-
STL
17h 48m1 stop
American Airlines Logo
6:00 am - 5:03 pm
STL
-
SJU
9h 03m2 stops
$230American Airlines
Thu, Jan 15 - Mon, Jan 19
American Airlines Logo
6:00 am - 2:47 pm
SJU
-
STL
10h 47m2 stops
American Airlines Logo
6:00 am - 11:56 pm
STL
-
SJU
15h 56m1 stop
$231American Airlines
Thu, Jan 15 - Mon, Jan 19
Frontier Logo
5:25 pm - 11:59 pm
SJU
-
STL
8h 34m1 stop
Frontier Logo
4:51 pm - 1:58 am
STL
-
SJU
8h 07m1 stop
$249Frontier
Mon, Mar 2 - Sun, Mar 8
Frontier Logo
9:23 pm - 10:33 pm
SJU
-
STL
27h 10m1 stop
Frontier Logo
5:11 pm - 6:24 pm
STL
-
SJU
23h 13m1 stop
$251Frontier
Wed, Jan 7 - Tue, Jan 13
Frontier Logo
4:36 pm - 11:33 pm
SJU
-
STL
8h 57m1 stop
Frontier Logo
11:18 am - 11:59 pm
STL
-
SJU
10h 41m1 stop
$266Frontier
Tue, Jan 20 - Fri, Jan 23
American Airlines Logo
5:00 am - 12:28 pm
SJU
-
STL
8h 28m1 stop
American Airlines Logo
2:00 pm - 10:40 pm
STL
-
SJU
7h 40m1 stop
$273American Airlines
Thu, Mar 26 - Mon, Mar 30
Frontier Logo
4:36 pm - 11:33 pm
SJU
-
STL
8h 57m1 stop
Frontier Logo
11:18 am - 11:59 pm
STL
-
SJU
10h 41m1 stop
$286Frontier
Tue, Jan 20 - Fri, Jan 23

Southwest flights from Puerto Rico to St. Louis

Our best Southwest deals on Puerto Rico to St. Louis flight tickets
Southwest
Apr 14
SJU5:35 amSan Juan Luis Munoz Marin Intl
8h 50m
2 stops
STL1:25 pmLambert-St Louis
Apr 17
STL2:25 pmLambert-St Louis
8h 00m
1 stop
SJU11:25 pmSan Juan Luis Munoz Marin Intl
$345
Find similar
Southwest
Apr 14
SJU5:35 amSan Juan Luis Munoz Marin Intl
8h 50m
2 stops
STL1:25 pmLambert-St Louis
Apr 17
STL2:10 pmLambert-St Louis
8h 30m
2 stops
SJU11:40 pmSan Juan Luis Munoz Marin Intl
$365
Find similar
Southwest
Jan 17
SJU1:45 pmSan Juan Luis Munoz Marin Intl
5h 10m
STL4:55 pmLambert-St Louis
Jan 21
STL1:45 pmLambert-St Louis
8h 50m
1 stop
SJU12:35 amSan Juan Luis Munoz Marin Intl
$590
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
Jan 15
SJU7:07 amSan Juan Luis Munoz Marin Intl
17h 48m
1 stop
STL10:55 pmLambert-St Louis
Jan 19
STL6:00 amLambert-St Louis
9h 03m
2 stops
SJU5:03 pmSan Juan Luis Munoz Marin Intl
$230
Find similar
American Airlines
Jan 15
SJU6:00 amSan Juan Luis Munoz Marin Intl
10h 47m
2 stops
STL2:47 pmLambert-St Louis
Jan 19
STL6:00 amLambert-St Louis
15h 56m
1 stop
SJU11:56 pmSan Juan Luis Munoz Marin Intl
$231
Find similar
American Airlines
Mar 26
SJU5:00 amSan Juan Luis Munoz Marin Intl
8h 28m
1 stop
STL12:28 pmLambert-St Louis
Mar 30
STL2:00 pmLambert-St Louis
7h 40m
1 stop
SJU10:40 pmSan Juan Luis Munoz Marin Intl
$273
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 December 26, 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 1/29

4:36 pm-11:33 pm

1 stop8h 57m

Lambert-St Louis

Mon 2/2

10:16 am-11:59 pm

1 stop11h 43m

$180

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Thu 1/15

4:06 pm-10:34 pm

1 stop8h 28m

Lambert-St Louis

Mon 1/19

5:11 pm-2:48 am

1 stop7h 37m

$199

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Sat 1/17

8:10 am-5:43 pm

2 stops11h 33m

Lambert-St Louis

Wed 1/21

6:00 am-4:36 pm

1 stop8h 36m

$225

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Thu 1/15

7:07 am-10:55 pm

1 stop17h 48m

Lambert-St Louis

Mon 1/19

6:00 am-5:03 pm

2 stops9h 03m

$230

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Thu 1/15

6:00 am-2:47 pm

2 stops10h 47m

Lambert-St Louis

Mon 1/19

6:00 am-11:56 pm

1 stop15h 56m

$231

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Mon 3/2

5:25 pm-11:59 pm

1 stop8h 34m

Lambert-St Louis

Sun 3/8

4:51 pm-1:58 am

1 stop8h 07m

$249

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Wed 1/7

9:23 pm-10:33 pm

1 stop27h 10m

Lambert-St Louis

Tue 1/13

5:11 pm-6:24 pm

1 stop23h 13m

$251

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Tue 1/20

4:36 pm-11:33 pm

1 stop8h 57m

Lambert-St Louis

Fri 1/23

11:18 am-11:59 pm

1 stop10h 41m

$266

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Thu 3/26

5:00 am-12:28 pm

1 stop8h 28m

Lambert-St Louis

Mon 3/30

2:00 pm-10:40 pm

1 stop7h 40m

$273

San JuanSt. Louis

SJU - STL

SJUSTL

San Juan Luis Munoz Marin Intl

Tue 1/20

4:36 pm-11:33 pm

1 stop8h 57m

Lambert-St Louis

Fri 1/23

11:18 am-11:59 pm

1 stop10h 41m

$286

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 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 $256. 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 $624. 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 $624 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 $399 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 $210 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

7h 02m

Direct flights

Sun

Airports in St. Louis

1 airport
The fastest flight from Puerto Rico to St. Louis takes 7h 02m
Direct flights go from Puerto Rico to St. Louis on Sunday. The only airline offering direct flights is Southwest.
There is 1 airport in St. Louis. From Puerto Rico there are direct flights to 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
3,070 reviews
Search Frontier flights
DeltaPriceFrom $205Free CancellationRating
7.9
8,013 reviews
Search Delta flights
United AirlinesPriceFrom $225Free CancellationRating
7.4
9,115 reviews
Search United Airlines flights
American AirlinesPriceFrom $225Free CancellationRating
7.2
11,062 reviews
Search American Airlines flights
SouthwestPriceFrom $342Free CancellationRating
8.0
4,258 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
Maryland Heights
O'Fallon
Florissant
Fenton
St. Peters
Wentzville
Collinsville
Alton
Farmington
Clayton
Festus
Glencoe
Eureka
Edwardsville
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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