Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from St. Louis to San Juan from $58

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 2/10. 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

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

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
5:42 pm - 9:54 am
STL
-
SJU
14h 12m1 stop
Frontier Logo
5:25 pm - 10:27 pm
SJU
-
STL
7h 02m1 stop
$172Frontier
Sat, Jan 31 - Wed, Feb 11
Frontier Logo
5:42 pm - 9:54 am
STL
-
SJU
14h 12m1 stop
Frontier Logo
8:00 am - 8:04 am
SJU
-
STL
26h 04m1 stop
$176Frontier
Sat, Jan 31 - Sat, Feb 7
Frontier Logo
5:42 pm - 9:54 am
STL
-
SJU
14h 12m1 stop
Frontier Logo
8:00 am - 11:33 pm
SJU
-
STL
17h 33m1 stop
$177Frontier
Sat, Jan 24 - Sat, Jan 31
Frontier Logo
3:43 pm - 12:05 am
STL
-
SJU
6h 22m1 stop
Frontier Logo
9:23 pm - 10:34 pm
SJU
-
STL
27h 11m1 stop
$180Frontier
Thu, Jan 8 - Mon, Jan 12
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
$181Frontier
Thu, Jan 29 - Mon, Feb 2
Frontier Logo
3:43 pm - 12:31 am
STL
-
SJU
6h 48m1 stop
Frontier Logo
7:34 pm - 10:34 pm
SJU
-
STL
29h 00m1 stop
$183Frontier
Sun, Jan 11 - Wed, Jan 14
Frontier Logo
5:42 pm - 9:54 am
STL
-
SJU
14h 12m1 stop
Frontier Logo
8:00 am - 11:33 pm
SJU
-
STL
17h 33m1 stop
$197Frontier
Sat, Jan 24 - Mon, Feb 2
Frontier Logo
3:49 pm - 12:43 am
STL
-
SJU
6h 54m1 stop
Frontier Logo
11:07 am - 11:19 pm
SJU
-
STL
13h 12m1 stop
$199Frontier
Wed, Mar 4 - Tue, Mar 10
Frontier Logo
5:11 pm - 1:49 pm
STL
-
SJU
18h 38m1 stop
Frontier Logo
3:58 am - 10:34 pm
SJU
-
STL
20h 36m1 stop
$200Frontier
Sat, Jan 10 - Fri, Jan 16
Frontier Logo
5:11 pm - 2:50 am
STL
-
SJU
7h 39m1 stop
Frontier Logo
4:36 pm - 11:33 pm
SJU
-
STL
8h 57m1 stop
$201Frontier
Wed, Jan 7 - Wed, Feb 4

Frontier flights from St. Louis to San Juan

Our best Frontier deals on St. Louis to San Juan flight tickets
Frontier
Jan 31
STL5:42 pmLambert-St Louis
14h 12m
1 stop
SJU9:54 amSan Juan Luis Munoz Marin Intl
Feb 11
SJU5:25 pmSan Juan Luis Munoz Marin Intl
7h 02m
1 stop
STL10:27 pmLambert-St Louis
$172
Find similar
Frontier
Jan 31
STL5:42 pmLambert-St Louis
14h 12m
1 stop
SJU9:54 amSan Juan Luis Munoz Marin Intl
Feb 7
SJU8:00 amSan Juan Luis Munoz Marin Intl
26h 04m
1 stop
STL8:04 amLambert-St Louis
$176
Find similar
Frontier
Jan 24
STL5:42 pmLambert-St Louis
14h 12m
1 stop
SJU9:54 amSan Juan Luis Munoz Marin Intl
Jan 31
SJU8:00 amSan Juan Luis Munoz Marin Intl
17h 33m
1 stop
STL11:33 pmLambert-St Louis
$177
Find similar

Spirit Airlines flights from St. Louis to San Juan

Our best Spirit Airlines deals on St. Louis to San Juan flight tickets
Spirit Airlines
Dec 25
STL11:51 amLambert-St Louis
8h 14m
1 stop
SJU10:05 pmSan Juan Luis Munoz Marin Intl
Dec 31
SJU2:59 amSan Juan Luis Munoz Marin Intl
9h 57m
2 stops
STL10:56 amLambert-St Louis
$568
Find similar
Spirit Airlines
Dec 25
STL11:51 amLambert-St Louis
8h 14m
1 stop
SJU10:05 pmSan Juan Luis Munoz Marin Intl
Dec 29
SJU2:59 amSan Juan Luis Munoz Marin Intl
9h 57m
2 stops
STL10:56 amLambert-St Louis
$587
Find similar
Spirit Airlines
Dec 25
STL11:51 amLambert-St Louis
8h 14m
1 stop
SJU10:05 pmSan Juan Luis Munoz Marin Intl
Dec 31
SJU2:59 amSan Juan Luis Munoz Marin Intl
9h 57m
2 stops
STL10:56 amLambert-St Louis
$611
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 December 18, 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

Sat 1/31

5:42 pm-9:54 am

1 stop14h 12m

San Juan Luis Munoz Marin Intl

Wed 2/11

5:25 pm-10:27 pm

1 stop7h 02m

$172

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 1/31

5:42 pm-9:54 am

1 stop14h 12m

San Juan Luis Munoz Marin Intl

Sat 2/7

8:00 am-8:04 am

1 stop26h 04m

$176

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 1/24

5:42 pm-9:54 am

1 stop14h 12m

San Juan Luis Munoz Marin Intl

Sat 1/31

8:00 am-11:33 pm

1 stop17h 33m

$177

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

Mon 1/12

9:23 pm-10:34 pm

1 stop27h 11m

$180

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Thu 1/29

5:42 pm-3:26 pm

1 stop19h 44m

San Juan Luis Munoz Marin Intl

Mon 2/2

8:00 am-11:33 pm

1 stop17h 33m

$181

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sun 1/11

3:43 pm-12:31 am

1 stop6h 48m

San Juan Luis Munoz Marin Intl

Wed 1/14

7:34 pm-10:34 pm

1 stop29h 00m

$183

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 1/24

5:42 pm-9:54 am

1 stop14h 12m

San Juan Luis Munoz Marin Intl

Mon 2/2

8:00 am-11:33 pm

1 stop17h 33m

$197

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Wed 3/4

3:49 pm-12:43 am

1 stop6h 54m

San Juan Luis Munoz Marin Intl

Tue 3/10

11:07 am-11:19 pm

1 stop13h 12m

$199

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 1/10

5:11 pm-1:49 pm

1 stop18h 38m

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

Wed 1/7

5:11 pm-2:50 am

1 stop7h 39m

San Juan Luis Munoz Marin Intl

Wed 2/4

4:36 pm-11:33 pm

1 stop8h 57m

$201

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 $646.

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 $355 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 25m

Direct flights

Sun

Airports in San Juan

2 airports
The fastest flight from St. Louis to San Juan takes 4h 25m
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 25m.

  • 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
3,081 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $170Free CancellationRating
6.3
8,190 reviews
Search Spirit Airlines flights
DeltaPriceFrom $205Free CancellationRating
7.9
8,008 reviews
Search Delta flights
SouthwestPriceFrom $219Free CancellationRating
7.9
4,250 reviews
Search Southwest flights
United AirlinesPriceFrom $225Free CancellationRating
7.4
9,093 reviews
Search United Airlines flights
American AirlinesPriceFrom $262Free CancellationRating
7.2
11,055 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.

An easier way to manage your San Juan trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sat 1/17
Sat 1/24
By creating a price alert you accept our terms of use and privacy policy.

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