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Cheap flights from St. Louis to Puerto Rico from $86

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 1/31. 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 St. Louis to Puerto Rico

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
3:49 pm - 2:53 am
STL
-
SJU
9h 04m1 stop
Frontier Logo
11:07 am - 10:27 pm
SJU
-
STL
13h 20m1 stop
$171Frontier
Tue, Feb 24 - Wed, Feb 25
Frontier Logo
12:12 pm - 9:54 am
STL
-
SJU
19h 42m1 stop
Frontier Logo
8:00 am - 11:33 pm
SJU
-
STL
17h 33m1 stop
$172Frontier
Sat, Jan 24 - Wed, Jan 28
Frontier Logo
3:49 pm - 2:53 am
STL
-
SJU
9h 04m1 stop
Frontier Logo
5:25 pm - 10:27 pm
SJU
-
STL
7h 02m1 stop
$176Frontier
Mon, Feb 23 - Wed, Feb 25
Frontier Logo
3:49 pm - 12:43 am
STL
-
SJU
6h 54m1 stop
Frontier Logo
5:25 pm - 11:59 pm
SJU
-
STL
8h 34m1 stop
$180Frontier
Wed, Feb 25 - Mon, Mar 2
Frontier Logo
3:43 pm - 12:05 am
STL
-
SJU
6h 22m1 stop
Frontier Logo
8:57 am - 10:34 pm
SJU
-
STL
15h 37m1 stop
$181Frontier
Thu, Jan 8 - Wed, Jan 14
Frontier Logo
5:11 pm - 2:50 am
STL
-
SJU
7h 39m1 stop
Frontier Logo
3:58 am - 10:34 pm
SJU
-
STL
20h 36m1 stop
$200Frontier
Sat, Jan 10 - Fri, Jan 16
Frontier Logo
5:42 pm - 10:24 am
STL
-
SJU
14h 42m1 stop
Frontier Logo
8:00 am - 11:33 pm
SJU
-
STL
17h 33m1 stop
$202Frontier
Thu, Jan 22 - Tue, Jan 27
Frontier Logo
5:42 pm - 3:26 pm
STL
-
SJU
19h 44m1 stop
Frontier Logo
8:00 am - 11:33 pm
SJU
-
STL
17h 33m1 stop
$211Frontier
Fri, Jan 23 - Wed, Jan 28
Frontier Logo
3:43 pm - 12:05 am
STL
-
SJU
6h 22m1 stop
Frontier Logo
9:23 pm - 8:05 am
SJU
-
STL
12h 42m1 stop
$215Frontier
Thu, Jan 8 - Sun, Jan 11
Frontier Logo
4:51 pm - 9:57 am
STL
-
SJU
15h 06m1 stop
Frontier Logo
3:08 am - 7:07 am
SJU
-
STL
28h 59m1 stop
$218Frontier
Sat, Mar 7 - Tue, Mar 10

Frontier flights from St. Louis to Puerto Rico

Our best Frontier deals on St. Louis to Puerto Rico flight tickets
Frontier
Feb 24
STL3:49 pmLambert-St Louis
9h 04m
1 stop
SJU2:53 amSan Juan Luis Munoz Marin Intl
Feb 25
SJU11:07 amSan Juan Luis Munoz Marin Intl
13h 20m
1 stop
STL10:27 pmLambert-St Louis
$171
Find similar
Frontier
Jan 24
STL12:12 pmLambert-St Louis
19h 42m
1 stop
SJU9:54 amSan Juan Luis Munoz Marin Intl
Jan 28
SJU8:00 amSan Juan Luis Munoz Marin Intl
17h 33m
1 stop
STL11:33 pmLambert-St Louis
$172
Find similar
Frontier
Feb 23
STL3:49 pmLambert-St Louis
9h 04m
1 stop
SJU2:53 amSan Juan Luis Munoz Marin Intl
Feb 25
SJU5:25 pmSan Juan Luis Munoz Marin Intl
7h 02m
1 stop
STL10:27 pmLambert-St Louis
$176
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
Feb 26
STL2:00 pmLambert-St Louis
7h 44m
1 stop
SJU11:44 pmSan Juan Luis Munoz Marin Intl
Mar 7
SJU7:00 pmSan Juan Luis Munoz Marin Intl
16h 32m
1 stop
STL9:32 amLambert-St Louis
$296
Find similar
American Airlines
Jan 2
STL6:44 pmLambert-St Louis
8h 50m
1 stop
SJU5:34 amSan Juan Luis Munoz Marin Intl
Feb 12
SJU2:26 pmSan Juan Luis Munoz Marin Intl
11h 02m
2 stops
STL11:28 pmLambert-St Louis
$400
Find similar
American Airlines
Dec 30
STL5:00 amLambert-St Louis
8h 48m
2 stops
SJU3:48 pmSan Juan Luis Munoz Marin Intl
Jan 1
SJU6:18 amSan Juan Luis Munoz Marin Intl
8h 14m
1 stop
STL12:32 pmLambert-St Louis
$655
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 December 23, 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 2/24

3:49 pm-2:53 am

1 stop9h 04m

San Juan Luis Munoz Marin Intl

Wed 2/25

11:07 am-10:27 pm

1 stop13h 20m

$171

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 1/24

12:12 pm-9:54 am

1 stop19h 42m

San Juan Luis Munoz Marin Intl

Wed 1/28

8:00 am-11:33 pm

1 stop17h 33m

$172

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Mon 2/23

3:49 pm-2:53 am

1 stop9h 04m

San Juan Luis Munoz Marin Intl

Wed 2/25

5:25 pm-10:27 pm

1 stop7h 02m

$176

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 2/25

3:49 pm-12:43 am

1 stop6h 54m

San Juan Luis Munoz Marin Intl

Mon 3/2

5:25 pm-11:59 pm

1 stop8h 34m

$180

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Thu 1/8

3:43 pm-12:05 am

1 stop6h 22m

San Juan Luis Munoz Marin Intl

Wed 1/14

8:57 am-10:34 pm

1 stop15h 37m

$181

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 1/10

5:11 pm-2:50 am

1 stop7h 39m

San Juan Luis Munoz Marin Intl

Fri 1/16

3:58 am-10:34 pm

1 stop20h 36m

$200

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Thu 1/22

5:42 pm-10:24 am

1 stop14h 42m

San Juan Luis Munoz Marin Intl

Tue 1/27

8:00 am-11:33 pm

1 stop17h 33m

$202

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 1/23

5:42 pm-3:26 pm

1 stop19h 44m

San Juan Luis Munoz Marin Intl

Wed 1/28

8:00 am-11:33 pm

1 stop17h 33m

$211

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Thu 1/8

3:43 pm-12:05 am

1 stop6h 22m

San Juan Luis Munoz Marin Intl

Sun 1/11

9:23 pm-8:05 am

1 stop12h 42m

$215

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 3/7

4:51 pm-9:57 am

1 stop15h 06m

San Juan Luis Munoz Marin Intl

Tue 3/10

3:08 am-7:07 am

1 stop28h 59m

$218

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 $660.

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 $445 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 $352 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 25m

Direct flights

Sun

Airports in Puerto Rico

20 airports
The fastest flight from St. Louis to Puerto Rico takes 4h 25m
Direct flights go from St. Louis to Puerto Rico on Sunday. There are no airlines offering direct flights.
There are 20 airports in Puerto Rico. From St. Louis there are direct flights to 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
3,074 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $170Free CancellationRating
6.3
8,194 reviews
Search Spirit Airlines flights
DeltaPriceFrom $205Free CancellationRating
7.9
8,014 reviews
Search Delta flights
SouthwestPriceFrom $219Free CancellationRating
8.0
4,253 reviews
Search Southwest flights
United AirlinesPriceFrom $225Free CancellationRating
7.4
9,106 reviews
Search United Airlines flights
American AirlinesPriceFrom $263Free CancellationRating
7.2
11,050 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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