SJU - STL

$117 Find Cheap Flights from San Juan to St. Louis - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from San Juan to St. Louis departing on 9/20. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$296
Typical prices: $336-$596
Frontier
Wed 8/12Mon 8/17
SJU - STL • 1 stop
Cheapest non-stop
$652
JetBlue
Sat 12/19Sat 12/26
SJU - STL • Non-stop
Top airlines
Cheapest • from $296 (round-trip)
Best reviews • 8.0 score
Airline reviews
Airline reviews
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Airline reviews
Airline reviews
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Nonstop flights
Not available
There are currently no direct flights between San Juan and St. Louis. You'll need at least 1 connection.
Insights
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Top layover airports
Cheapest • Avg $225 (round-trip)
Shortest trip • 6h 27m (one-way)
Insights
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Insights
When to book
in advance
Our data shows that travelers who book at least 5 weeks in advance save around 44% compared to booking last minute.
Insights
Insights
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Insights
When to travel
Cheapest • 41% price drop
Most popular
Good to know
Good to know
+1
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We hope you love your trip to St. Louis!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights from San Juan to St. Louis (SJU-STL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from San Juan to St. Louis that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from San Juan to St. Louis

Wed, Aug 12 - Mon, Aug 17
Frontier Logo
5:20 pm - 5:37 pm
SJU
-
STL
25h 17m
1 stop
Frontier Logo
4:57 pm - 12:56 am
STL
-
SJU
30h 59m
2 stops
$296Frontier
Thu, Sep 17 - Mon, Sep 21
Frontier Logo
9:03 am - 7:39 pm
SJU
-
STL
11h 36m
1 stop
Frontier Logo
10:35 am - 11:57 pm
STL
-
SJU
36h 22m
2 stops
$316Frontier
Thu, Oct 1 - Mon, Oct 5
Frontier Logo
4:30 pm - 9:40 am
SJU
-
STL
18h 10m
1 stop
Frontier Logo
10:35 am - 11:57 pm
STL
-
SJU
12h 22m
2 stops
$319Frontier
Tue, Aug 11 - Sat, Aug 15
Frontier Logo
6:26 am - 8:57 am
SJU
-
STL
27h 31m
2 stops
Frontier Logo
4:57 pm - 2:16 pm
STL
-
SJU
20h 19m
1 stop
$322Frontier
Sun, Aug 16 - Sun, Aug 23
Frontier Logo
6:26 am - 8:57 am
SJU
-
STL
27h 31m
2 stops
Frontier Logo
6:17 pm - 2:16 pm
STL
-
SJU
18h 59m
1 stop
$323Frontier
Tue, Aug 11 - Sun, Aug 16
Frontier Logo
6:26 am - 8:57 am
SJU
-
STL
27h 31m
2 stops
Frontier Logo
6:34 pm - 2:16 pm
STL
-
SJU
18h 42m
1 stop
$324Frontier
Thu, Aug 13 - Sun, Aug 30
Frontier Logo
6:00 am - 5:37 pm
SJU
-
STL
12h 37m
2 stops
Frontier Logo
6:17 pm - 2:16 pm
STL
-
SJU
18h 59m
1 stop
$325Frontier
Mon, Aug 10 - Sat, Aug 15
Frontier Logo
3:10 am - 5:37 pm
SJU
-
STL
15h 27m
2 stops
Frontier Logo
4:57 pm - 2:16 pm
STL
-
SJU
20h 19m
1 stop
$326Frontier
Wed, Aug 12 - Sun, Aug 16
Frontier Logo
8:37 pm - 5:37 pm
SJU
-
STL
22h 00m
2 stops
Frontier Logo
6:34 pm - 2:16 pm
STL
-
SJU
18h 42m
1 stop
$327Frontier
Mon, Aug 10 - Mon, Aug 17
Frontier Logo
3:10 am - 5:37 pm
SJU
-
STL
15h 27m
2 stops
Frontier Logo
4:57 pm - 2:16 pm
STL
-
SJU
20h 19m
1 stop
$328Frontier
Booking Insights

KAYAK's insights & trends for San Juan to St. Louis flights

Get data-powered insights and trends into flights from San Juan to St. Louis to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from San Juan Luis Munoz Marin Intl Airport to St. Louis?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from San Juan Luis Munoz Marin Intl Airport to St. Louis departing in August.

Flight prices are below average for this route right now.

Flights to St. Louis from San Juan Luis Munoz Marin Intl Airport usually cost between $411 and $593 in August.
The lowest price found in the past 5 days was $296 on Frontier (Aug 12-Aug 17).

What is the cheapest month to fly from San Juan Luis Munoz Marin Intl Airport to St. Louis?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from San Juan Luis Munoz Marin Intl Airport to St. Louis, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from San Juan Luis Munoz Marin Intl Airport to St. Louis is January, where tickets cost $248 (return) on average. On the other hand, the most expensive months are July and June, where the average cost of round-trip tickets is $543 and $486 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from San Juan Luis Munoz Marin Intl Airport to St. Louis, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from San Juan Luis Munoz Marin Intl Airport to St. Louis, you should book around 5 weeks before departure, which saves you about 44% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 24 weeks before departure.

Expert advice

Expert advice for your flight from San Juan to St. Louis

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Yulia Denisyuk

Yulia Denisyuk

Expert on STL

Yulia is a freelance journalist who’s dispatched from 90+ countries. Her work focuses on cultures, adventure trips and air travel, appearing in NatGeo, NYT, CNTraveler, and more. For past assignments, she’s stayed with nomads in Mongolia and learned the art of Imigongo in Rwanda. She’s based in Chicago; in winter she often questions that decision.

Gabriel Leigh

Gabriel Leigh

Expert on SJU

Gabriel is a writer and video creator. As senior content producer for Flightradar24 and Monocle’s transport correspondent, he keeps a close eye on aviation in particular. He has also written travel articles for the likes of The New York Times. Born in New York but raised around the world, he now lives in Sweden. He’s been to 75 countries, flying 2.3 million miles on 113 airlines and through 234 airports in the process.

Good to know

Low season

January

Cheapest flight

$117
Best time to beat the crowds with an average 42% drop in price.
Most popular time to fly with an average 9% increase in price.
Flight from San Juan to St. Louis

When to book flights from San Juan to St. Louis

Are your dates flexible? Find out the best times to travel from San Juan to St. Louis based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking San Juan to St. Louis flights

  • How many flights are there between San Juan Luis Munoz Marin Intl Airport and St. Louis per day?

    There is a maximum of 1 nonstop flight a day that takes off from San Juan Luis Munoz Marin Intl Airport and lands in St. Louis, with an average flight time of 4h 35m. The most common departure time is 3:00 pm and most flights take off in the afternoon. Each week, there are 1 flights.

  • What is the cheapest flight from San Juan Luis Munoz Marin Intl Airport to St. Louis?

    In the last 5 days, the lowest price for a flight from San Juan Luis Munoz Marin Intl Airport to St. Louis was $117 for a one-way ticket and $296 for a round-trip.

  • Do I need a passport to fly between San Juan and St. Louis?

    Yes

  • Which airports will I be using when flying from San Juan to St. Louis?

    San Juan and St. Louis are both served by 1 main airport. You will leave San Juan from San Juan Luis Munoz Marin Intl and will be arriving at Lambert-St Louis.

  • Which airlines offer Wi-Fi service onboard planes from San Juan to St. Louis?

    Only Delta offers inflight Wi-Fi service on the San Juan to St. Louis flight route.

  • Which aircraft models fly most regularly from San Juan to St. Louis?

    The Boeing 737-900 is the aircraft model that flies most regularly on the San Juan to St. Louis flight route.

  • Which airline alliances offer flights from San Juan to St. Louis?

    SkyTeam, and oneworld are the airline alliances operating flights between San Juan and St. Louis, with SkyTeam being the most commonly used for this route.

  • On which days can I fly direct from San Juan to St. Louis?

    You can catch a nonstop flight from San Juan to St. Louis on Saturday.

  • Which is the best airline for flights from San Juan to St. Louis, Southwest or Delta?

    The two airlines most popular with KAYAK users for flights from San Juan to St. Louis are Southwest and Delta. With an average price for the route of $566 and an overall rating of 8.0, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $596 and an overall rating of 7.8.

  • How does KAYAK find such low prices on flights from San Juan to St. Louis?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from San Juan to St. Louis.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from San Juan to St. Louis?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from San Juan is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from San Juan to St. Louis?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to St. Louis with an airline and back to San Juan with another airline. Booking your flights between San Juan and STL can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from San Juan to St. Louis?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Louis from San Juan up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from San Juan Luis Munoz Marin Intl Airport to St. Louis

  • Looking for a cheap flight? 25% of our users found flights on this route for $164 or less one-way.

Reviews of the top 4 airlines serving from San Juan to St. Louis

 
See real verified KAYAK customer reviews for airlines flying from San Juan to St. Louis. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from San Juan to St. Louis? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4238 reviews
8.6Crew
8.1Boarding
8.0Comfort
7.0Food
7.5Entertainment
Airline reviews

I have roller bag with food and medication told me I couldn't bring on my 2nd flight today. 15 years flying with SW never an issue with that bag.

2.0 MediocreStuart, Mar 2026
HOU - STL
Read more Southwest reviews

I have roller bag with food and medication told me I couldn't bring on my 2nd flight today. 15 years flying with SW never an issue with that bag.

I have not flown Southwest in awhile and had a very pleasant experience. From ticketing to boarding to the flight. The flight left on time and landed ahead of schedule. It won't be so long next time!!

Great plane, great attendants,great flight crew,on time. Wonderful flight home..

Everything went smoothly and we even arrived a little bit early.

Boarded on time but once we were ready for take off, the crew determined that, although every seat was taken, somehow someone was on the wrong flight. Delay, delay delay, announcements and ended up with one person checking EVERY ID against their passenger Manifest only to figure out it was a "clerical error." We departed 54 minutes late causing me to run in the St. Louis Airport to make my connection and lose the priority boarding spot I had paid for. Unnecessary delay.

Southwest's seats are the least comfortable I have ever sat in.

For my birthday trip this was my second time ever flying, this trip was the best.

Crew was great flight was great baggage claim was a failure. It took over 1 hour for bags to arrive. Poor communication poor effort when I spoke to the supervisor about the delay

Everything was great except the food. The pretzels are really crappy.

I had a front row middle. I am not a big person and I barely fit in between that seat! No place to put my arms, even though the guys on each side were not taking over the arm rests. It felt like a frontier flight (if that tells you everything )

The seats were really comfortable. Flight crew were friendly with passengers. Overall was a great flight.

Great crew, flight on time, luggage pick up a breeze

The boarding process needs to be refined. Sometimes the gate crew calls out the zones and then flip to showing the.zones boarding on the gate monitor display. So, unless you are huddled around the gate lanes watching the monitor, you could miss your boarding zone. Suggest the zones be announced each time a new zone is allowed to board.

This route with Delta always has delays or is cancelled. Aircrafts seem smaller and older. I fly Delta quite a bit - haven’t had issues with the international flights. But this route has always been the troublesome one

Unfortunately I was stuck next to someone who should have purchased 2 seats instead of taking up their space and mine. I couldn’t move the entire 3+ hour flight. Very uncomfortable flight.

More extra space was awesome. Even though I was on the first groups to board, bin compartments were already occupied by passengers seated on other seat numbers. That is unacceptable.

Crew went over and above to be helpful. Plane had mechanical problems that caused us to depart late.

The flight was excellent, I recommend people to fly with Delta

As we lined up to board they gave our plane to a flight going to Newark. So then we got delayed until they could find another plane. Flight crew was ok. I’m assuming since it’s a shorter flight they only offered water and coffee.

When we enter the airplane there were many water drops falling from the ceiling all the way long to the seat , and when it departs were even more over us getting the hair wet , and later on was too hot , the A/C not work well.

We called Kayak for a change due to the TSA situation in Atlanta. What we got was a canceled return flight (in error) and we had to find the mistake. Not happy with Kayak who blamed it on AA.

Small plane, poor meal choices for first class, bad terminal and boarding experience at LAX

Boarding delayed 20 minutes for no reason, no wifi, in flight entertainment, or snacks / waters?

This flight captain and crew were amazing, started ahead of time of departure and reached 30 mins before arrival time. Amazing!

Improvements in communication and empathy are absolutely necessary for American Airlines staff (top down). It’s like they are numb to the needs of their customers.

I like the speed of boarding and deplaning and the fact that everything was on time. The crew (attendants) were probably quite new and did not begin the in cabin service until 30 min before landing even though there was little to no air turbulence for the last 1.5 hours of the flight. It made for a mad scramble at the end to get trash collected and carts stowed before touch down.

The flights was delayed by hours and it was the firmest landing I have experienced in my life. My back is still sore.

I did like the employee's, they are very friendly and all smiled most of the time, Overall, from checking in bags to getting on plane, not enough employees to be able to get all on the plane, therefore I was not able to get on the plane, due to no one wea there for me to check in my bag, so I decided to go thru the security point and by the time they were done with my bags, I was told that my bag cannot be checked in, and then found out that the lady that does the check in was boarding the customers onto the plane, she said that she was going back and fourth, there for was not able to get on the plane, which changed all my flights by the time I got to Dallas, I was on standby 3 times, and wasn't sure about being able to get on the fourth plane, so ended up buying another plane ticket, so I could make my destination on time.

Not sure about entertainment as I didn't use any, so maybe there should be an NA option on this survey. Otherwise everything was just as it should be. Of course I wish planes were more comfortable and had seats that would tilt back further.

American Airlines “Randy” questioned why I needed preboarding and denied my request for same. Then Randy attempted to berate me when I boarded with my group. I was seated in an exit roll with a young man with a disability that exhibited difficulty controlling and settling himself. But Tandy questioned my disability. The flight was horrible. It was overpacked.

Frontier line changes my flight schedule with out my authorization. They never ask me and with out my concern they cut off 4 hours of my vacation they force my to leave 4 hours early from Puerto Rico.

Good- no snacks on a 4+ hour flight is painful but more painful was the lack of WiFi.

I guess you get what you pay for. The seats are very uncomfortable and very little space. The snacks were pricey.

Flight was changed (according to Frontier, by Kayak) without my notification. And all flights were delayed by at least an hour and a half. Uncomfortable plane. Bad service. Will never fly Frontier again.

Was left with many other passengers in SJU by frontier airlines due to delay caused by frontier. Worst experience ever and worst airline ever.

It was horrible. My plane was delayed until the next day resulting in me losing a day of work. It’s absolutely unacceptable and I won’t be flying with you any more and I will strongly caution others to avoid your airline as well.

When we arrived we lasted 48 minutes to be able to get off the plane without air and the plane turned off more than half of the passengers because after they started to leave they realized that the bridge was defective

Pro: The stuff was great. Friendly, patient and caring. Our seat row was clean. The bath room was clean. Our flights were close to on time. Con: The leg room is too small. No blankets or pillows. No entertainment devices at all. I can’t remember to have a food choice. I would fly again with frontier for short distances.

The experience was terrible. The flight boarded late, then after leaving the gate the plane had had to return to the gate for fuel. After 2 hours on the plane, the flight was canceled. The reasons given for the cancelation didn't sound truthful. and different reasons were given. My 15 year old daughter was flying alone on this flight. When they all disembarked the plane she kept asking the crew what she was supposed to do. No one even gave her the courtesy of a response. No one. It took another 4.75 hrs to be out of customs and baggage. She was re-booked the following day. That flight departed 2 hours late. After all of that, they offered a measly $100 flight voucher with an expiry date of 3 months! All in all a terrible experience. We won't be using Frontier again in the future.

Great option to American Airlines. Affordable prices when compared to AA. Prices in AA to and from Puerto Rico are like Fly Emirates to Kwait.

Everything you need to know for your flight from San Juan to St. Louis

Information on your arrival and departure airports