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Cheap flights from St. Louis to San Juan from $113

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 11/15. 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 St. Louis to San Juan

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
6:00 am - 2:14 pmSTL-SJU
6h 14m1 stop
Delta Logo
3:32 pm - 9:02 pmSJU-STL
7h 30m1 stop
$225Delta
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Tue, Dec 9 - Fri, Dec 12
Frontier Logo
2:12 pm - 9:24 pmSTL-SJU
6h 12m1 stop
Frontier Logo
3:59 am - 9:40 amSJU-STL
7h 41m1 stop
$272Frontier
Find Deal
Fri, Oct 31 - Thu, Nov 6
Southwest Logo
3:45 pm - 12:35 amSTL-SJU
6h 50m1 stop
Southwest Logo
4:40 pm - 10:00 pmSJU-STL
7h 20m1 stop
$294Southwest
Find Deal
Wed, Nov 5 - Wed, Nov 12
American Airlines Logo
6:00 am - 3:53 pmSTL-SJU
7h 53m1 stop
American Airlines Logo
2:47 pm - 11:07 pmSJU-STL
10h 20m2 stops
$300American Airlines
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Fri, Nov 14 - Mon, Nov 17
Multiple Airlines Logo
6:22 pm - 7:39 pmSTL-SJU
23h 17m1 stop
Multiple Airlines Logo
4:31 pm - 4:01 pmSJU-STL
25h 30m1 stop
$309Multiple Airlines
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Thu, Nov 6 - Thu, Nov 13
United Airlines Logo
11:05 am - 9:00 pmSTL-SJU
7h 55m1 stop
United Airlines Logo
8:10 am - 3:46 pmSJU-STL
9h 36m1 stop
$315United Airlines
Find Deal
Tue, Nov 4 - Thu, Nov 6
United Airlines Logo
11:20 am - 8:26 pmSTL-SJU
8h 06m1 stop
United Airlines Logo
2:05 am - 10:52 amSJU-STL
10h 47m1 stop
$316United Airlines
Find Deal
Wed, Oct 29 - Tue, Nov 4
Multiple Airlines Logo
2:12 pm - 1:54 amSTL-SJU
10h 42m1 stop
Multiple Airlines Logo
7:30 am - 4:01 pmSJU-STL
34h 31m2 stops
$329Multiple Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
Southwest Logo
1:50 pm - 12:35 amSTL-SJU
8h 45m2 stops
Southwest Logo
8:55 am - 7:15 pmSJU-STL
12h 20m1 stop
$342Southwest
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Wed, Nov 5 - Wed, Nov 12
American Airlines Logo
5:15 am - 5:52 pmSTL-SJU
10h 37m2 stops
American Airlines Logo
11:00 am - 11:59 pmSJU-STL
14h 59m1 stop
$355American Airlines
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Wed, Dec 10 - Wed, Dec 17

Southwest flights from St. Louis to San Juan

Our best Southwest deals on St. Louis to San Juan flight tickets
Southwest
Nov 5
STL3:45 pmLambert-St Louis
6h 50m
1 stop
SJU12:35 amSan Juan Luis Munoz Marin Intl
Nov 12
SJU4:40 pmSan Juan Luis Munoz Marin Intl
7h 20m
1 stop
STL10:00 pmLambert-St Louis
$294
Find similar
Southwest
Nov 5
STL1:50 pmLambert-St Louis
8h 45m
2 stops
SJU12:35 amSan Juan Luis Munoz Marin Intl
Nov 12
SJU8:55 amSan Juan Luis Munoz Marin Intl
12h 20m
1 stop
STL7:15 pmLambert-St Louis
$342
Find similar
Southwest
Oct 14
STL8:55 amLambert-St Louis
12h 50m
2 stops
SJU10:45 pmSan Juan Luis Munoz Marin Intl
Oct 15
SJU5:05 amSan Juan Luis Munoz Marin Intl
9h 45m
2 stops
STL1:50 pmLambert-St Louis
$515
Find similar

United Airlines flights from St. Louis to San Juan

Our best United Airlines deals on St. Louis to San Juan flight tickets
United Airlines
Nov 4
STL11:05 amLambert-St Louis
7h 55m
1 stop
SJU9:00 pmSan Juan Luis Munoz Marin Intl
Nov 6
SJU8:10 amSan Juan Luis Munoz Marin Intl
9h 36m
1 stop
STL3:46 pmLambert-St Louis
$315
Find similar
United Airlines
Oct 29
STL11:20 amLambert-St Louis
8h 06m
1 stop
SJU8:26 pmSan Juan Luis Munoz Marin Intl
Nov 4
SJU2:05 amSan Juan Luis Munoz Marin Intl
10h 47m
1 stop
STL10:52 amLambert-St Louis
$316
Find similar
United Airlines
Nov 3
STL10:00 amLambert-St Louis
9h 00m
1 stop
SJU9:00 pmSan Juan Luis Munoz Marin Intl
Nov 12
SJU8:10 amSan Juan Luis Munoz Marin Intl
8h 14m
1 stop
STL2:24 pmLambert-St Louis
$359
Find similar

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 October 2, 2025.
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

Tue 12/9

6:00 am-2:14 pm

1 stop6h 14m

San Juan Luis Munoz Marin Intl

Fri 12/12

3:32 pm-9:02 pm

1 stop7h 30m

$225

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 10/31

2:12 pm-9:24 pm

1 stop6h 12m

San Juan Luis Munoz Marin Intl

Thu 11/6

3:59 am-9:40 am

1 stop7h 41m

$272

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 11/5

3:45 pm-12:35 am

1 stop6h 50m

San Juan Luis Munoz Marin Intl

Wed 11/12

4:40 pm-10:00 pm

1 stop7h 20m

$294

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Fri 11/14

6:00 am-3:53 pm

1 stop7h 53m

San Juan Luis Munoz Marin Intl

Mon 11/17

2:47 pm-11:07 pm

2 stops10h 20m

$300

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Thu 11/6

6:22 pm-7:39 pm

1 stop23h 17m

San Juan Luis Munoz Marin Intl

Thu 11/13

4:31 pm-4:01 pm

1 stop25h 30m

$309

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Tue 11/4

11:05 am-9:00 pm

1 stop7h 55m

San Juan Luis Munoz Marin Intl

Thu 11/6

8:10 am-3:46 pm

1 stop9h 36m

$315

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 10/29

11:20 am-8:26 pm

1 stop8h 06m

San Juan Luis Munoz Marin Intl

Tue 11/4

2:05 am-10:52 am

1 stop10h 47m

$316

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Thu 10/30

2:12 pm-1:54 am

1 stop10h 42m

San Juan Luis Munoz Marin Intl

Thu 11/6

7:30 am-4:01 pm

2 stops34h 31m

$329

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 11/5

1:50 pm-12:35 am

2 stops8h 45m

San Juan Luis Munoz Marin Intl

Wed 11/12

8:55 am-7:15 pm

1 stop12h 20m

$342

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 12/10

5:15 am-5:52 pm

2 stops10h 37m

San Juan Luis Munoz Marin Intl

Wed 12/17

11:00 am-11:59 pm

1 stop14h 59m

$355

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 $368.

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

The cheapest day to depart from St. Louis to San Juan is on a Wednesday when prices can be found for as low as $404. The most expensive day to fly to San Juan is Saturday, with ticket prices averaging around $636.

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 evening when flights can be purchased for as low as $310. 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 $447 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 $331 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

1 airport
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 is 1 airport near San Juan: 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 6h 05m.

  • 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 $140Free CancellationRating
5.8
3,155 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $170Free CancellationRating
6.3
8,070 reviews
Search Spirit Airlines flights
DeltaPriceFrom $208Free CancellationRating
7.9
7,962 reviews
Search Delta flights
United AirlinesPriceFrom $219Free CancellationRating
7.4
8,933 reviews
Search United Airlines flights
SouthwestPriceFrom $219Free CancellationRating
8.0
4,248 reviews
Search Southwest flights
American AirlinesPriceFrom $255Free CancellationRating
7.2
10,000 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