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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 2/24. 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
4:54 pm - 2:01 am
STL
-
SJU
8h 07m
1 stop
Frontier Logo
11:07 am - 11:19 pm
SJU
-
STL
13h 12m
1 stop
$202Frontier
Tue, Apr 7 - Wed, Apr 15
Frontier Logo
3:49 pm - 2:53 am
STL
-
SJU
9h 04m
1 stop
Frontier Logo
10:04 am - 11:19 pm
SJU
-
STL
14h 15m
1 stop
$208Frontier
Tue, Mar 3 - Mon, Mar 9
Frontier Logo
3:49 pm - 9:54 am
STL
-
SJU
16h 05m
1 stop
Frontier Logo
3:08 am - 11:19 pm
SJU
-
STL
21h 11m
1 stop
$211Frontier
Mon, Mar 2 - Sun, Mar 8
Frontier Logo
4:55 pm - 9:54 am
STL
-
SJU
15h 59m
1 stop
Frontier Logo
6:30 am - 11:19 pm
SJU
-
STL
17h 49m
1 stop
$213Frontier
Tue, May 5 - Thu, May 7
Frontier Logo
3:49 pm - 2:53 am
STL
-
SJU
9h 04m
1 stop
Frontier Logo
3:08 am - 11:19 pm
SJU
-
STL
21h 11m
1 stop
$216Frontier
Tue, Mar 3 - Sun, Mar 8
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
$220Frontier
Thu, Mar 5 - Mon, Mar 9
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 - 2:48 am
STL
-
SJU
8h 59m
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 flights from St. Louis to San Juan Luis Munoz Marin Intl Airport

Our best Frontier deals on St. Louis to San Juan Luis Munoz Marin Intl Airport flight tickets
Frontier
Mar 2
STL3:49 pmLambert-St Louis
9h 04m
1 stop
SJU2:53 amSan Juan Luis Munoz Marin Intl
Mar 4
SJU11:07 amSan Juan Luis Munoz Marin Intl
13h 20m
1 stop
STL10:27 pmLambert-St Louis
$188
Frontier
Apr 7
STL4:54 pmLambert-St Louis
8h 07m
1 stop
SJU2:01 amSan Juan Luis Munoz Marin Intl
Apr 15
SJU11:07 amSan Juan Luis Munoz Marin Intl
13h 12m
1 stop
STL11:19 pmLambert-St Louis
$202
Frontier
Mar 3
STL3:49 pmLambert-St Louis
9h 04m
1 stop
SJU2:53 amSan Juan Luis Munoz Marin Intl
Mar 9
SJU10:04 amSan Juan Luis Munoz Marin Intl
14h 15m
1 stop
STL11:19 pmLambert-St Louis
$208

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to San Juan Luis Munoz Marin Intl Airport 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 3, 2026.
Use the filters below to find and compare flights from St. Louis to San Juan Luis Munoz Marin Intl Airport 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 4/7

4:54 pm-2:01 am

1 stop8h 07m

San Juan Luis Munoz Marin Intl

Wed 4/15

11:07 am-11:19 pm

1 stop13h 12m

$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

10:04 am-11:19 pm

1 stop14h 15m

$208

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Mon 3/2

3:49 pm-9:54 am

1 stop16h 05m

San Juan Luis Munoz Marin Intl

Sun 3/8

3:08 am-11:19 pm

1 stop21h 11m

$211

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Tue 5/5

4:55 pm-9:54 am

1 stop15h 59m

San Juan Luis Munoz Marin Intl

Thu 5/7

6:30 am-11:19 pm

1 stop17h 49m

$213

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

Sun 3/8

3:08 am-11:19 pm

1 stop21h 11m

$216

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 3/9

6:30 am-11:19 pm

1 stop17h 49m

$220

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-2:48 am

1 stop8h 59m

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

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 Luis Munoz Marin Intl Airport

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 San Juan Luis Munoz Marin Intl Airport?

If you aren’t able to travel to San Juan Luis Munoz Marin Intl Airport during the month of September, then flying in April is also cheap. Prices for this month can be found on momondo for an average of $361.

What is the cheapest time of day to depart on your flight to San Juan Luis Munoz Marin Intl Airport?

The cheapest time of day to fly to San Juan Luis Munoz Marin Intl Airport is in the morning when flights can be purchased for as low as $646. Flights at noon are often more expensive with an average ticket price of $660.

What is the cheapest Lambert-St Louis to San Juan Luis Munoz Marin Intl flight route?

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

How far in advance should I book a flight to San Juan Luis Munoz Marin Intl Airport?

You are more likely to see cheaper flights to San Juan Luis Munoz Marin Intl Airport from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to San Juan Luis Munoz Marin Intl Airport 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 Luis Munoz Marin Intl Airport from St. Louis for as low as $329 on momondo.

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

There is only 1 cabin class available to choose from on Lambert-St Louis to San Juan Luis Munoz Marin Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have St. Louis to San Juan Luis Munoz Marin Intl Airport flight prices changed over time?

As of February 2026, prices for St. Louis to San Juan Luis Munoz Marin Intl Airport flights are approximately 2% more expensive when compared to flights at the same time last year.

When to book flights from St. Louis to San Juan Luis Munoz Marin Intl Airport

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to San Juan Luis Munoz Marin Intl Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to San Juan Luis Munoz Marin Intl Airport (STL to SJU) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to San Juan Luis Munoz Marin Intl Airport

Fastest flight time

4h 15m

Direct flights

Sun
The fastest flight from St. Louis to San Juan Luis Munoz Marin Intl Airport takes 4h 15m
Direct flights go from St. Louis to San Juan Luis Munoz Marin Intl Airport on Sunday. There are no airlines offering direct flights.
Search flight deals

  • How far is Lambert-St Louis to San Juan Luis Munoz Marin Intl by plane?

    There are 2011.8 mi between Lambert-St Louis and San Juan Luis Munoz Marin Intl. A reasonable flight in good conditions will take 4h 15m.

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

    Prices for flights from Lambert-St Louis Airport to San Juan Luis Munoz Marin Intl Airport are updated daily.

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

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

    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 Luis Munoz Marin Intl Airport.

  • What documentation or ID do you need to fly to San Juan Luis Munoz Marin Intl Airport?

    The travel and health documents you'll need for your trip to San Juan Luis Munoz Marin Intl 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 San Juan Luis Munoz Marin Intl 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 St. Louis to San Juan Luis Munoz Marin Intl Airport?

  • What is the most popular airline from St. Louis to San Juan Luis Munoz Marin Intl Airport?

Best airlines flying from St. Louis to San Juan Luis Munoz Marin Intl Airport

Compare and see reviews for airlines that fly from St. Louis to San Juan Luis Munoz Marin Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $133Free CancellationRating
5.7
3,051 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $146Free CancellationRating
6.3
8,404 reviews
Search Spirit Airlines flights
DeltaPriceFrom $180Free CancellationRating
7.9
8,138 reviews
Search Delta flights
SouthwestPriceFrom $219Free CancellationRating
8.0
4,272 reviews
Search Southwest flights
United AirlinesPriceFrom $225Free CancellationRating
7.4
9,236 reviews
Search United Airlines flights
American AirlinesPriceFrom $236Free CancellationRating
7.2
11,216 reviews
Search American Airlines flights

Traveling to a place near San Juan?

Book flights to San Juan if you plan to visit one of these locations
Carolina
Fajardo
Dorado
Luquillo
Caguas
Humacao
Rio Grande
Bayamón

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?

All flight searches from St. Louis to San Juan on momondo can be filtered to show those which offer flexible booking policies.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to San Juan from St. Louis.

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 offers price alerts on flights to San Juan from St. Louis. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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