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Cheap flights from St. Louis to San Juan from $87

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 San Juan departing on 2/25. 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 San Juan

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
3:49 pm - 2:53 am
STL
-
SJU
9h 04m
1 stop
Frontier Logo
11:07 am - 10:27 pm
SJU
-
STL
13h 20m
1 stop
$188Frontier
Mon, Mar 2 - Wed, Mar 4
Frontier Logo
3:49 pm - 2:53 am
STL
-
SJU
9h 04m
1 stop
Frontier Logo
9:05 pm - 7:10 pm
SJU
-
STL
24h 05m
1 stop
$197Frontier
Tue, Mar 3 - Sat, Mar 7
Frontier Logo
4:55 pm - 2:01 am
STL
-
SJU
8h 06m
1 stop
Frontier Logo
3:19 pm - 11:19 pm
SJU
-
STL
9h 00m
1 stop
$202Frontier
Tue, Apr 14 - Tue, Apr 21
Frontier Logo
3:49 pm - 2:53 am
STL
-
SJU
9h 04m
1 stop
Frontier Logo
6:30 am - 11:19 pm
SJU
-
STL
17h 49m
1 stop
$208Frontier
Tue, Mar 3 - Mon, Mar 9
Frontier Logo
4:51 pm - 1:58 am
STL
-
SJU
8h 07m
1 stop
Frontier Logo
6:30 am - 11:19 pm
SJU
-
STL
17h 49m
1 stop
$211Frontier
Mon, Mar 9 - Wed, Mar 11
Frontier Logo
4:51 pm - 2:03 am
STL
-
SJU
8h 12m
1 stop
Frontier Logo
5:30 am - 5:40 pm
SJU
-
STL
13h 10m
1 stop
$221Frontier
Tue, Mar 10 - Mon, Mar 16
Frontier Logo
3:49 pm - 12:43 am
STL
-
SJU
6h 54m
1 stop
Frontier Logo
5:25 pm - 10:27 pm
SJU
-
STL
7h 02m
1 stop
$223Frontier
Tue, Feb 17 - Tue, Feb 24
Frontier Logo
3:49 pm - 2:53 am
STL
-
SJU
9h 04m
1 stop
Frontier Logo
5:30 am - 5:40 pm
SJU
-
STL
13h 10m
1 stop
$230Frontier
Thu, Mar 5 - Mon, Mar 16
Frontier Logo
4:55 pm - 2:01 am
STL
-
SJU
8h 06m
1 stop
Frontier Logo
6:30 am - 11:19 pm
SJU
-
STL
17h 49m
1 stop
$234Frontier
Sat, May 9 - Wed, May 13
Multiple Airlines Logo
3:49 pm - 1:37 am
STL
-
SJU
31h 48m
2 stops
Multiple Airlines Logo
5:25 pm - 10:27 pm
SJU
-
STL
31h 02m
1 stop
$235Multiple Airlines
Tue, Feb 24 - Tue, Mar 3

Southwest flights from St. Louis to San Juan

Our best Southwest deals on St. Louis to San Juan flight tickets
Southwest
Mar 9
STL1:40 pmLambert-St Louis
9h 45m
1 stop
SJU12:25 amSan Juan Luis Munoz Marin Intl
Mar 11
SJU5:15 amSan Juan Luis Munoz Marin Intl
15h 45m
2 stops
STL8:00 pmLambert-St Louis
$246
Southwest
Feb 24
STL8:15 amLambert-St Louis
8h 50m
2 stops
SJU7:05 pmSan Juan Luis Munoz Marin Intl
Feb 26
SJU6:30 amSan Juan Luis Munoz Marin Intl
12h 45m
2 stops
STL5:15 pmLambert-St Louis
$305

United Airlines flights from St. Louis to San Juan

Our best United Airlines deals on St. Louis to San Juan flight tickets
United Airlines
Apr 18
STL10:09 amLambert-St Louis
9h 29m
1 stop
SJU8:38 pmSan Juan Luis Munoz Marin Intl
Apr 24
SJU1:00 amSan Juan Luis Munoz Marin Intl
10h 45m
2 stops
STL10:45 amLambert-St Louis
$284
United Airlines
Feb 22
STL4:49 pmLambert-St Louis
11h 22m
2 stops
SJU6:11 amSan Juan Luis Munoz Marin Intl
Feb 25
SJU7:40 amSan Juan Luis Munoz Marin Intl
9h 58m
1 stop
STL3:38 pmLambert-St Louis
$301

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to San Juan 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 February 2, 2026.
Use the filters below to find and compare flights from St. Louis to San Juan that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Mon 3/2

3:49 pm-2:53 am

1 stop9h 04m

San Juan Luis Munoz Marin Intl

Wed 3/4

11:07 am-10:27 pm

1 stop13h 20m

$188

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Tue 3/3

3:49 pm-2:53 am

1 stop9h 04m

San Juan Luis Munoz Marin Intl

Sat 3/7

9:05 pm-7:10 pm

1 stop24h 05m

$197

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Tue 4/14

4:55 pm-2:01 am

1 stop8h 06m

San Juan Luis Munoz Marin Intl

Tue 4/21

3:19 pm-11:19 pm

1 stop9h 00m

$202

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Tue 3/3

3:49 pm-2:53 am

1 stop9h 04m

San Juan Luis Munoz Marin Intl

Mon 3/9

6:30 am-11:19 pm

1 stop17h 49m

$208

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Mon 3/9

4:51 pm-1:58 am

1 stop8h 07m

San Juan Luis Munoz Marin Intl

Wed 3/11

6:30 am-11:19 pm

1 stop17h 49m

$211

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Tue 3/10

4:51 pm-2:03 am

1 stop8h 12m

San Juan Luis Munoz Marin Intl

Mon 3/16

5:30 am-5:40 pm

1 stop13h 10m

$221

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Tue 2/17

3:49 pm-12:43 am

1 stop6h 54m

San Juan Luis Munoz Marin Intl

Tue 2/24

5:25 pm-10:27 pm

1 stop7h 02m

$223

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Thu 3/5

3:49 pm-2:53 am

1 stop9h 04m

San Juan Luis Munoz Marin Intl

Mon 3/16

5:30 am-5:40 pm

1 stop13h 10m

$230

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 5/9

4:55 pm-2:01 am

1 stop8h 06m

San Juan Luis Munoz Marin Intl

Wed 5/13

6:30 am-11:19 pm

1 stop17h 49m

$234

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Tue 2/24

3:49 pm-1:37 am

2 stops31h 48m

San Juan Luis Munoz Marin Intl

Tue 3/3

5:25 pm-10:27 pm

1 stop31h 02m

$235

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 San Juan from

How to get the cheapest flight ticket from St. Louis to San Juan

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 typical price of a round-trip flight between St. Louis and San Juan?

What is the cheapest month to fly to San Juan?

If you’re not able to fly to San Juan in September, then April is your next best option. Flight prices from St. Louis to San Juan during April average around $361.

What is the cheapest time of day to depart on your flight to San Juan?

The cheapest time of day to fly to San Juan is in the morning when flights can be purchased for as low as $646. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $660 on average. Flights to San Juan from St. Louis at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

What is the cheapest Lambert-St Louis to San Juan flight route?

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

How far in advance should I book a flight to San Juan?

You are more likely to see cheaper flights to San Juan from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to San Juan for around $437 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Juan from St. Louis for as low as $329 on momondo.

What cabin class options are available on Lambert-St Louis to San Juan flights?

There is only 1 cabin class available to choose from on Lambert-St Louis to San Juan 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 San Juan flight deals and tips

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

Fastest flight time

4h 15m

Direct flights

Sun

Airports in San Juan

2 airports
The fastest flight from St. Louis to San Juan takes 4h 15m
Direct flights go from St. Louis to San Juan on Sunday. There are no airlines offering direct flights.
There are 2 airports in San Juan. From St. Louis there are direct flights to San Juan Luis Munoz Marin Intl (SJU).
Search flight deals

  • How far is Lambert-St Louis to San Juan by plane?

    There are 2005.8 mi between Lambert-St Louis and San Juan. In terms of flight time, this usually takes a little over 4h 15m.

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

    Prices for flights from Lambert-St Louis Airport to San Juan are refreshed on a daily basis.

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

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

    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 San Juan.

  • What documentation or ID do you need to fly to San Juan?

    The travel and health documents you'll need for your trip to San Juan 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 San Juan. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from St. Louis to San Juan

Compare and see reviews for airlines that fly from St. Louis to San Juan with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $133Free CancellationRating
5.7
3,050 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $146Free CancellationRating
6.3
8,395 reviews
Search Spirit Airlines flights
DeltaPriceFrom $180Free CancellationRating
7.9
8,129 reviews
Search Delta flights
SouthwestPriceFrom $219Free CancellationRating
8.0
4,272 reviews
Search Southwest flights
United AirlinesPriceFrom $225Free CancellationRating
7.4
9,229 reviews
Search United Airlines flights
American AirlinesPriceFrom $236Free CancellationRating
7.2
11,211 reviews
Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to San Juan?

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

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

Yes. momondo allows you to filter the results for St. Louis to San Juan flights to just show those with flexible booking policies.

How can momondo help me find flights from St. Louis to San Juan?

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 San Juan.

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

Yes. momondo can track prices for St. Louis to San Juan 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

Fly into one of these airports located in San Juan

Airports listed have a maximum distance of 7.1 mi from San Juan
San Juan Isla Grande Airport
San Juan Luis Munoz Marin Intl Airport