SJU - STL

$89 Find Cheap Flights from San Juan to St. Louis

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 5/2. 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

KAYAK searches hundreds of travel sites at once for deals on flights to St. Louis

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from San Juan to St. Louis, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from San Juan to St. Louis, as well as popular online travel agencies
Travelers love KAYAK
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Everything you should know

Cheapest round-trip
$176
Typical prices: $540-$347
Frontier
Thu 5/7Sun 5/10
SJU - STL • 1 stop
Cheapest one-way
$89
Typical prices: $158-$202
Frontier
Sat 5/2
SJU - STL • 1 stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
For late-night departures, bring food to SJU early.
Use MetroLink for easy access from STL to downtown.
Expert advice
Expert advice
Expert advice
Expert advice
Nonstop flights
1 day a week
Sat
You can fly direct with Southwest. Average duration is 0
Direct flights
Direct flights
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Direct flights
Direct flights
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Top airlines
Cheapest • from $176 (round-trip)
Best reviews • 8.0 score
Airline reviews
Airline reviews
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Airline reviews
Airline reviews
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Top layover airports
Cheapest • Avg $225 (round-trip)
Shortest trip • 6h 57m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 50% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 40% price drop
Most popular
Good to know
Good to know
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to St. Louis!
Flight Deals
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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

Thu, May 7 - Sun, May 10
Frontier Logo
3:03 am - 12:21 am
SJU
-
STL
22h 18m
1 stop
Frontier Logo
4:19 pm - 8:04 am
STL
-
SJU
14h 45m
1 stop
$176Frontier
Thu, May 7 - Sun, May 10
Frontier Logo
3:33 pm - 12:21 am
SJU
-
STL
9h 48m
1 stop
Frontier Logo
4:19 pm - 2:08 am
STL
-
SJU
8h 49m
1 stop
$186Frontier
Tue, Apr 28 - Sat, May 2
Frontier Logo
6:30 am - 11:19 pm
SJU
-
STL
17h 49m
1 stop
Frontier Logo
4:59 pm - 2:01 am
STL
-
SJU
8h 02m
1 stop
$226Frontier
Thu, Aug 13 - Tue, Aug 25
Frontier Logo
6:16 pm - 12:14 am
SJU
-
STL
6h 58m
1 stop
Frontier Logo
4:10 pm - 1:54 am
STL
-
SJU
8h 44m
1 stop
$258Frontier
Wed, May 20 - Mon, May 25
Frontier Logo
6:41 pm - 4:15 pm
SJU
-
STL
22h 34m
2 stops
Frontier Logo
5:27 pm - 11:59 pm
STL
-
SJU
29h 32m
2 stops
$259Frontier
Tue, Jun 9 - Fri, Jun 12
Frontier Logo
6:50 am - 6:24 pm
SJU
-
STL
12h 34m
1 stop
Frontier Logo
4:17 pm - 2:09 am
STL
-
SJU
8h 52m
1 stop
$270Frontier
Thu, Jun 18 - Sat, Jun 20
Frontier Logo
6:16 pm - 12:09 am
SJU
-
STL
6h 53m
1 stop
Frontier Logo
7:19 pm - 4:55 am
STL
-
SJU
8h 36m
1 stop
$276Frontier
Thu, Jun 18 - Sat, Jun 20
Frontier Logo
9:24 am - 12:09 am
SJU
-
STL
15h 45m
1 stop
Frontier Logo
4:17 pm - 2:09 am
STL
-
SJU
8h 52m
1 stop
$287Frontier
Thu, Apr 30 - Mon, May 4
Frontier Logo
3:39 pm - 11:19 pm
SJU
-
STL
8h 40m
1 stop
Frontier Logo
4:59 pm - 2:01 am
STL
-
SJU
8h 02m
1 stop
$291Frontier
Thu, Apr 30 - Mon, May 4
Frontier Logo
3:39 pm - 11:19 pm
SJU
-
STL
8h 40m
1 stop
Frontier Logo
4:59 pm - 2:01 am
STL
-
SJU
8h 02m
1 stop
$301Frontier
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 May.

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 June and July, where the average cost of round-trip tickets is $548 and $537 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 4 weeks before departure, which saves you about 50% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 16 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 seasonJanuary
Cheapest flight$89
Best time to beat the crowds with an average 41% 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

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

    In the last 3 days, the lowest price for a flight from San Juan Luis Munoz Marin Intl Airport to St. Louis was $89 for a one-way ticket and $176 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 American Airlines 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 Airbus A321-100/200 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.

  • 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 $595 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 $507 and an overall rating of 7.9.

  • 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.

Prefer to fly direct from San Juan to St. Louis?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from San Juan Luis Munoz Marin Intl to Lambert-St Louis.
Find which airlines fly direct from San Juan Luis Munoz Marin Intl Airport to Lambert-St Louis Airport, which days they fly and book direct flights.

Direct departures

San Juan Luis Munoz Marin Intl to Lambert-St Louis

Saturday

Southwest

Southwest

See more direct flights

Direct returns

Lambert-St Louis to San Juan Luis Munoz Marin Intl

Saturday

Southwest

Southwest

See more direct flights

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 4331 reviews
8.1Boarding
8.0Comfort
8.6Crew
7.0Food
7.5Entertainment
Airline reviews

The seat was not comfortable. 1D. My back was sore all night and the next day.

8.0 ExcellentJolene, Apr 2026
LAS - DAL
Read more Southwest reviews

The seat was not comfortable. 1D. My back was sore all night and the next day.

Great flight. I didn't get a drink because I was asleep whole on the flight.

Great flight from Seattle to Phoenix and to Chicago-Midway from Phoenix

Terrible all around. Left prior review detailing massive delay/cancellation to then rebook travel. Topping on the cake was lost luggage even after travel to ultimate destination was secured on a new plane(s).

The new boarding process was easy and straightforward. Very pleasant.

The flight was okay. The pilots did an amazing job and kept us updated on the flight. The flight attendants were okay. They found time to be chatty with each other rather than focus on the guests. One of the attendants was a little less warm when asking about my bag I had on my lap that I was using during latter part of the mid- flight. Mind you, it was not the departure descent. I’m respectful to each and every attendant, it was the tone in her voice reminding me to place my carryon bag on the floor. I hope to have a better experience next time.

The entire travel day was a disaster from beginning to end. Woke up at two in the morning to make it to San Juan airport in time for a 5:30 am flight to Milwaukee which connected in Baltimore. Massive delays lead to me missing original connection out of Baltimore. Sixteen hours of delays/rebooking/layover time later, arrived in Milwaukee to find that only one of two checked bags made it there (despite the fact that Southwest brought another 737 jet to San Juan to fly us out to our original Baltimore connection—-not squeezed into another booked flight). The flight from Baltimore to Milwaukee was barely half full, so there was no logical reason to ship my bags out of Baltimore on a different flight to Chicago to then ship to Milwaukee. Southwest decided that my bags should not have been on the same connecting flight I WAS ON to Milwaukee, and then proceeded to accidentally leave my larger bag with the important items in Chicago. Terrible logic and support all around. Extremely angered and disappointed with SW. What a clownish operation your company has become!

It was as expected and I was grateful for the wheel chair help and ease of use.

One of the best airlines for fast boarding, on time arrivals, and top notch service!

The new seat assignment thing is wierd. If you don’t pay for a seat they always assign you a middle seat regardless of how many people are on the flight. Idk… the new company that bought Southwest is trying to make it more profitable, but I’m just not seeing it. The flight attendants aren’t having as much fun anymore. It just feels like the airline is slowly dying. IMO. We shall see if Southwest is the next Toy’s R Us.

Very old plane with no inflight entertainment. I purchased the internet pass and it was nearly unusable.

My tray was broken so i had no place to work or eat except my lap. Flight attendant said I would get an email with some credit or miles, it was a complete waste of time as I could only function at about 20% of normal. I have not received anything yet.

Short trip, no food and therefore no expectation for much interaction with staff who were pleasant and professional. My critique is on comfort of the seats. Exit rows and comfort seats do not provide enough personal space for 3 side-by-side seats, especially when in the middle row. Some passengers are not considerate of the middle seat and there should be signs that state something to the effect of: "please consider giving middle seats use of the armrests."

My flight yesterday evening was delayed 3.5 hours with no water or food service. Poor experience

Transparency from pilots, quick boarding and exiting the plane, staff greeted to each and everyone,

Didn't like sitting on the waiting pad for 30 minutes right after departing the gate. If you're going to do that, just don't board so people can still get up and walk around in the terminal. My luggage was damaged by the baggage handlers.

Pilots lied about waiting on “paperwork”. Sat in the plane for over an hour, waiting on some papers to be printed according to the pilot and then all of a sudden he says good news maintenance is finally on their way. Maybe they can fix it before we get our paperwork. Ended up missing my connection in LaGuardia and as a result, had a fly home to Lexington instead of the Louisville airport. Then paid $100 to uber to Louisville since it was midnight by the time I got in. I wish they would just be transparent with passengers sometimes and not try to beat around the bush on why things are delayed.

The WiFi was horrific. I fly delta often and love their (usually reliable and free) WiFi. On this flight it was intermittent and when it did connect was extremely slow. I couldn’t get any work done while I was on the flight which was extremely frustrating. I was also in the exit row seat where there is now immediate seat in front of you, so while the leg room was nice, I couldn’t even watch the TV when the internet wasn’t working. Finally, for the last 20 mins of the flight, the announcement indicator came on the TV screens and took them over, even though no announcement was being made. Really disappointed.

The flight was way too HOT! And the plane did not have any in-flight TV entertainment.

The tray table was broken and the food was terrible.

This short sector between Miami and JFK was undertaken purely for business purposes, with efficiency as the primary objective rather than a full inflight experience. Overall, the journey met its intended purpose; however, the ground experience at Miami stood out significantly. During check-in, I was unable to link my frequent flyer details from Qatar Airways (oneworld alliance) through either the self-service kiosk or web check-in. The situation was handled exceptionally well by the check-in agent, who demonstrated remarkable ownership. She coordinated across multiple counters, ensured my frequent flyer number was correctly reflected, reissued the boarding pass, and confirmed that mileage accrual would be recognized. Additionally, she ensured the boarding pass reflected priority status, enabling a seamless priority check-in experience without delays. This level of proactive service was both commendable and impactful. Boarding and the inflight experience, operated by American Airlines under a codeshare arrangement, were efficient but largely transactional. While operational delivery was smooth, there was no visible recognition of oneworld frequent flyer status onboard. In comparison to the consistently personalized engagement typically experienced with Qatar Airways, this absence was noticeable—though understandably a potential limitation of codeshare alignment rather than a direct service shortfall. In summary, while the flight itself fulfilled its operational intent, the exceptional professionalism and commitment demonstrated at the Miami check-in counter was the defining highlight of this journey. Greater consistency in elite recognition across partner airlines would further enhance the overall experience.

It was good. However, I didn’t expect for a delayed flight. Need to catch bus or ride going to Bakersfield since I need to be there the funeral of my Uncle.

I was able to get the AA customer Service desk to put me on an earlier flight without any issues.

The seat was comfortable, the attendants were very nice and WiFi made my life so much easier with work. Kudos!

AA was a very good experience. The employees are wonderful

Flight was 3 hours delayed. They gave our plan to two other routes. Need to knock that off.

To have arrived on time and not 3 hours late after having already spent $100 to change to an earlier flight, only to arrive back home close to the original flight time.

No gate in Rome. Had stairs. Got separated from my wife in a wheel chair. Customs was a zoo. If AA doesnt have landing rights, it should be advertised.

I almost missed my flight and they helped me out enormously

Business class was very good, one of my best flights

They didn’t offer a water, even after I asked

Zero issues with this flight. Crew was outstanding and flight was super. Plane was clean and fine. The seats need more padding and water should be provided without cost. I recognize it's Frontier but there are some things that should still be part of the flight. But still very satisfied with the experience and quality.

They switched our terminal 3 times and we were delayed for four plus hours!!!

It was an early flight and most people napped/slept and the crew let us which was nice.

The crew acted like they had never done this and kept barking passive aggressive orders at people. + the security line + the delay + sitting on the tarmac for 2 hours + none of the apps or signage updating with correct times

More inflight connection. And leg space is horrible. And the paying for baggage I'd ridiculous!!!

My flight was originally from SAT to MCO connecting from MCO to ORD. We got diverted to ATL and than Frontier staff there was sooo un helpful first they said they couldn’t give us any accommodation since our flight first got delayed that cancelled and now it’s 221am and I am still in ATL since they said they need to create a new flight my final destination is ORD and I have been delayed twice and cancelled. With no real help the frontier app didn’t work no email updates over all such a horrible experience

There's no seats that lean back with little leg space i wad uncomfortable the entire flight. Your charges for extra baggage is despicable and costly!!

Remind customers of the need to have passport or new ID for boarding.

Flight was canceled. Most upsetting was message from Kayak, stating that the flight was canceled and click with Kayak for details regarding rebook, refund details. THERE'S NO INFORMATION PROVIDED BY KAYAK EXCEPT THAT FLIGHT IS CANCELED. AND NOW THIS SURVEY TO FIND OUT HOW WAS THE FLIGHT !!!!!!!

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

Information on your arrival and departure airports