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STL - SJU

$108 Find cheap flights from St. Louis to San Juan

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to San Juan departing on 6/1. 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
0 bags
sáb. 6/8
sáb. 6/15

Search hundreds of travel sites at once for deals on flights to San Juan

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to San Juan.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to San Juan.
In the last 7 days travelers have searched 43,968,530 times on KAYAK, and here is why:

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

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to San Juan 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 and deals for you by selecting your travel dates.
Choose your dates
10:34 am - 7:11 pmSTL-SJU
7h 37m1 stop
9:06 pm - 5:28 pmSJU-STL
21h 22m1 stop
$193Spirit Airlines
Find Deal
mar., jun. 4 - mié., jun. 5
5:15 pm - 4:45 pmSTL-SJU
22h 30m2 stops
3:33 am - 7:22 pmSJU-STL
16h 49m1 stop
$205Spirit Airlines
Find Deal
sáb., jun. 1 - mié., jun. 5
8:47 am - 5:51 pmSTL-SJU
8h 04m1 stop
9:00 pm - 4:25 pmSJU-STL
20h 25m1 stop
mié., may. 22 - vie., may. 31
5:25 pm - 2:09 amSTL-SJU
7h 44m1 stop
10:23 pm - 7:08 amSJU-STL
9h 45m1 stop
$218Frontier
Find Deal
sáb., may. 18 - lun., may. 20
9:26 pm - 10:47 amSTL-SJU
12h 21m1 stop
10:15 pm - 7:08 amSJU-STL
9h 53m1 stop
$226Frontier
Find Deal
lun., may. 20 - mié., may. 22
5:31 am - 8:11 pmSTL-SJU
13h 40m1 stop
6:33 am - 5:14 pmSJU-STL
11h 41m2 stops
$315American Airlines
Find Deal
sáb., sep. 7 - sáb., sep. 14
5:04 am - 5:05 pmSTL-SJU
11h 01m1 stop
6:15 am - 4:48 pmSJU-STL
11h 33m2 stops
$341American Airlines
Find Deal
mié., may. 29 - mié., jun. 5
10:00 am - 10:03 pmSTL-SJU
11h 03m1 stop
3:49 pm - 9:31 pmSJU-STL
7h 42m1 stop
$434Delta
Find Deal
mié., oct. 30 - sáb., nov. 9
11:10 am - 3:42 pmSTL-SJU
27h 32m2 stops
1:05 am - 3:49 pmSJU-STL
15h 44m2 stops
$494United Airlines
Find Deal
sáb., sep. 7 - vie., sep. 13
5:20 pm - 1:45 pmSTL-SJU
19h 25m3 stops
1:05 am - 12:22 pmSJU-STL
12h 17m2 stops
$507United Airlines
Find Deal
sáb., sep. 7 - vie., sep. 13

Flights from St. Louis to San Juan - Travel Insights & Trends

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

What’s the cheapest day of the week to fly from St. Louis to San Juan?

The average price of all flights from St. Louis to San Juan Luis Munoz Marin Intl Airport clicked on KAYAK for each day over the last 12 months.
If you are looking for a flight deal from St. Louis to San Juan, look for departures on Wednesdays and avoid leaving on a Friday, as it's usually the priciest day. When flying back from San Juan, Thursday is the cheapest day to fly and Saturday is the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from St. Louis to San Juan Luis Munoz Marin Intl Airport, 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 St. Louis to San Juan Luis Munoz Marin Intl Airport is April, where tickets cost $344 on average. On the other hand, the most expensive months are December and November, where the average cost of tickets is $582 and $548 respectively.

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

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from St. Louis to San Juan Luis Munoz Marin Intl Airport, removes the top 0.1% to account for outliers, and then takes the average of all the values for each month.
To get a below average price on the flight from St. Louis to San Juan Luis Munoz Marin Intl Airport, you should book around 1 day before departure. For the absolute cheapest price, our data suggests you should book 90 days before departure.

Which airlines provide the cheapest flights from St. Louis to San Juan?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
The best deals for a one-way ticket found by KAYAK users over the last 3 days were on Spirit Airlines ($108) and Frontier ($109). The cheapest round-trip tickets were found on Spirit Airlines ($193) and Frontier ($218).

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

Each day, there are 2 nonstop flights that take off from St. Louis and land in San Juan Luis Munoz Marin Intl Airport, with an average flight time of 4h 30m. The most common departure time is 9:00 am and most flights take off in the morning. Each week, there are 2 flights and there are the same amount of flights each day 2.

What’s the earliest departure time from St. Louis to San Juan?

Early birds can take the earliest flight from St. Louis at 9:30 am and will be landing in San Juan Luis Munoz Marin Intl Airport at 3:00 pm.

What’s the latest departure time from St. Louis to San Juan?

If you prefer to fly at night, the latest flight from St. Louis to San Juan Luis Munoz Marin Intl Airport jets off at 9:35 am and lands at 3:05 pm.

Good to know

Low season

November

High season

March

Cheapest flight

$108
Best time to beat the crowds but there is an average 19% increase in price.
Most popular time to fly with an average 11% increase in price.
Flight from St. Louis to San Juan

When to book flights from St. Louis to San Juan

Are your dates flexible? Find out the best times to travel from St. Louis to San Juan 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 St. Louis to San Juan flights

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

    In the last 3 days, the lowest price for a flight from St. Louis to San Juan Luis Munoz Marin Intl Airport was $108 for a one-way ticket and $193 for a round-trip.

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

    Yes, you'll most likely have to show a valid passport before boarding the plane in St. Louis and on arrival in San Juan.

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

    We unfortunately don’t have that data for this specific route.

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

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

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

    The two airlines most popular with KAYAK users for flights from St. Louis to San Juan are Delta and United Airlines. With an average price for the route of $449 and an overall rating of 8.0, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $643 and an overall rating of 7.4.

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

    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 St. Louis to San Juan.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Juan from St. Louis 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 St. Louis to San Juan?

    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 San Juan with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and SJU 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 St. Louis to San Juan?

    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 San Juan from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Prefer to fly non-stop from St. Louis to San Juan?

Find which airlines fly direct from Lambert-St Louis to Luis Munoz Marin Intl, which days they fly and book direct flights.

Nonstop departures

Lambert-St Louis to San Juan Luis Munoz Marin Intl

Saturday

Southwest

Southwest

See more direct flights

Nonstop returns

San Juan Luis Munoz Marin Intl to Lambert-St Louis

Saturday

Southwest

Southwest

See more direct flights
See more direct flights

Top 5 airlines serving from St. Louis to San Juan

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to San Juan. 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 St. Louis to San Juan? 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
DeltaOverall score based on 10778 reviews
7.9Comfort
8.6Crew
8.2Boarding
7.4Food
8.0Entertainment
Airline reviews

West Jet has a horrible boarding process and the seats have no cushion.

4.0 OkayDouglas, May 2024MSP - YEG
Read more about Delta reviews

West Jet has a horrible boarding process and the seats have no cushion.

Everything went smoothly. I didn’t like that when I booked in the main cabin my wife and I weren’t seated together. One would think when booking on an option that allows picking your seat. They would put you and your travel partner together. Had to call to get it sorted. They did fix.

The gate area was incredibly short staffed, with one representative manning 4-5 flights, which caused a 3 hr delay in boarding even though the plane was all ready to leave. Other flights also were delayed because of this. The flight crew was awesome and I feel bad for the only gate worker on call, but Delta needs to hire more employees.

Very frustrated with boarding gate crew. She announced the plane was small and they would be limiting us to one item to carry on. Not a problem for me as I understand the tiny planes have limited space!! Not the case here! It was a rather large plane and had plenty of room for bags! So because I don’t want to be one of “those people” who ignores the request to check a carry on I did so asking if I would be able to pick it up at the bottom of the ramp on arrival in Knoxville to which she responded “yes”! Then I watched as every other passenger held onto their 2 items and boarded!! Then when we arrived in Knoxville our 2 carry ons had been put with all the other luggage and we had to go to baggage pick up and wait for all the big checked bags to come off the carousel! So she lied!! Frustrating. Next time I won’t be so nice!

It was a good experience except when boarding a female flight attendant did not go out of her way to assist my teenage daughters in finding space for their carry-ons after their compartments were full.

On time departure, smooth trip, flight attendant told through passengers the gate we would arrive at and the gate our outbound flight was departing from. Early arrival

Checking in at the airport the agent only booked the first keg of my trip and had my checked luggage going to the airport with a layover! Never was issued a boarding pass for the second leg or received sticker fir my checked bag. All was well in the end! Delta agents helped to resolve the situation!!!

Delayed due to an ill passenger after loading. Not preventable on Delta's part. Was in first class. The seats are becoming worn and detaching from their velcro attachments. Only got snacks on flight. The attendant was not the friendliest.

I would fly again the whole experience was great. The only feed back I can give that they don't do that American Airlines does is the crew there is more humorous with boarding and thank their passengers. It makes it more fun to fly with them. I would however fly Delta again.

Big plane, long flight, absolutely no leg room and basically non existent air! I am 5”4’ and always travel Main Cabin, I was miserable on this plane and could barely move when we arrived in Cabo due to the cramped leg area!

Check in etc was very good. As for on the plane, it was like flying in a freezer. It was so cold, i have flown for years and never been so cold on a plane. Staff on board said its always cold when flying which is a load of rubbish. They wouldnt put any heating on and now i have the flu because of this .

I’ve had a couple flights this week on United that were delayed by an hour or more

Flight was delayed 2.5 hours - a big deal on an overnight when you plan to sleep.

I feel like they have upgraded the app since I last flew United and I found it to be super helpful. I had stopped flying United unless absolutely necessary and my experience on this trip indicates they have been working hard to improve their services.

Surprisingly easy! I was hesitant to try this, but the cost swayed me. I actually felt like I had less stress than all the taxiing and possible delays that occur with short regional flights where you spend less time in the air than getting to and from the plane..

This flight was delayed multiple times and eventually canceled around 2-3ish. Original take off time was around 10:30am. By 3, there were no other options out of Houston, so stuck in Houston for from 3pm - 11am the next day.

Should have video screens Plane audio was poor and without wired connection hard to understand crew. Should serve more than just cups of water and pretzels on six hour flight. Did not see crew rest of flight. Fix charging sockets to retain charging blocks.

I paid $380 for my one-way ticket from California to Minnesota. The fair did not include online check-in. I received instructions from their app to check in at a kiosk. At the kiosk, the boarding pass would not print until an actual person came to verify that I had a personal item and not a carry-on item, On the plane, the person next to me was drunk and allowed to continue to order alcohol. United is garbage I’d rather fly spirit.

The plane was dirty and the in seat air wasn't blowing as planes usually do.

Generally good but there wasn’t any staff available when my luggage didn’t appear at baggage claim in Fresno. It took about half an hour to locate a staff member to open up the locked room where it was being kept.

Left from gate 30 minutes before flight. Never been late to a flight ever. It says 15 minutes before explicitly on the ticket.

I like the boarding process, it was fast. The seat doesn’t have a TV for a long flight and food wasn’t served, just snacks.

Use planes with TVs on flights over 4 hours. The free entertainment was a cheap in between solution for a very long flight that you don't even bother providing meals or decent snacks.

Even though we left CMI late, we mostly made up the time.

Delayed almost 4 hours for a 45 minute flight with no explanation.

Again, multiple delays and I eventually just canceled and drove!

Great crew. Very comfortable business seats with nice bedding. Good food. We were delayed to let late passengers on the flight, but otherwise great experience.

Great crew. We were delayed so that late passengers could get on the flight. Love the bedding in business class. Good food. Great experience.

The CX617 from HK to BKK was delayed more than 1.5 hours.

Horrible - they lied to me about baggage & boarding, even though I specifically spoke to their agents the day before my flight about my issue. When I showed up they did not let me board and stranded me at my airport until I bought a new flight with money I did not have to spend.

Flight delayed then canceled! I will NEVER fly Spirit Airlines again and will tell all my friends!

Absolutely terrible. The boarding process had zero organization. Mobs of people trying to board. People were climbing over my child's stroller with her in it. No families were boarded first. Boarding was delayed with no reasoning or notification that it would be late. We were then stuck on the plane for 45 minutes after landing. Then waited over two hours for our luggage. There was zero communication with the travelers. Never have I experienced such I professionalism and disgrace of others. Extremely disappointed.

For it to have left on time! Instead of two hours early with zero notice

Flight kept delayed from morning to late afternoon so I had to make other arrangements

Crew was nice, explained emergency protocol very well. Flight took off and arrived on time. Pilot explained the small delay that occurred with docking and providing updates. I would definitely fly spirit again.

Terrible… missed our flight due to ridiculously long time to go thru baggage check-in!

The crew was not great or professional. It seemed like they didn't really want to be there. A true lack of effort for accommodating customers.

Everything was really good but the seats are not very comfortable.

I paid for WiFi, but it (WiFi) was very very slow, will never take again! Impossible open Utube 😤😤😤

I had no legroom, although I paid for extra legroom. I could barely put my bag in front of my feet and under the seat. The Wi-Fi was horrible. In fact the flight attendant said that they had to reboot it and see if it was going to work and never did.

I checked a bag because it was $5 less than carry on. They managed to lose my bag on a 2.5 hr direct flight! Frontier has no airport staff at baggage claim to help. As soon as I got home around 11 pm I tried to use their online system to file the claim for lost bag - system wouldn't take the # on my baggage claim ticket - said it was not the correct number. Also said that I had not checked a bag, which wasn't true - even my online boarding pass showed that I had checked a bag. Wasted about an hour on that process with no luck. Tried again in the morning - same thing. So tried online chat with Frontier bot - waited 35-40" twice to be connected to a baggage agent and it never happened. Eventually drove to PDX after work and waited 2 hrs for the Frontier ticket agents to arrive prior to the next Frontier flight out of PDX and FINALLY got some help from one of them, to take me to lost luggage area where I was able to retrive my bag. Probably took 4-5 hrs. of my time and endless frustration to get my bag. This was my first -- and LAST -- experience flying Frontier Airlines. Check-in was also extremely difficult and time consuming. The flight itself (and staff) were fine but everything else about the experience was a total disaster! The fact that Frontier literally has NO WAY to connect to a human voice for customer service (in this case for lost luggage) is the WORST!!!!!

Frontier is a crappy airline nothing about it is honest

I didn't get to do this flight l, hard to review

Not good 😐 Over priced baggage fees Small hard seats No wifi or entertainment options 😕

Didn't like anything!! Horrible flight. Small seating area and hard seats. Butt was sore after 2 hour flight to Seattle No entertainment or free refreshments No wifi or USB charging receptacles to charge phone entoute like other airliners Luggage rates were 3 times as much as competitors. Difficult to navigate online luggue process to pre pay before flight Overall bad experience WILL NEVER RIDE OR RECOMMEND FRONTIER TO FRIENDS OR FAMILY MEMBERS!!! THIS IS A SHAME!! MOST MESERIBLE FLIGHT OF MY LIFE!! AND I THOUGHT SPIRIT WAS 👎 YOU GOT THEM BEAD HANDS DOWN!!

Flight was a little late taking off. Seats are too upright, no ports to charge devices, no wifi, no entertainment

Six hour delay. Poor customer service. No voucher. Bad communication. Missed important appointments.

Our flight was delayed an hour, then when we got to board our flight finally, we were waiting in our seats for take off for 45 minutes before it was communicated that there was a maintenance issue therefore we waited on the plane for over an hour while that was resolved. We did not get to Phoenix until almost 3 hours after we were originally supposed to. This was the first and last time I will be flying Frontier.

Flight was canceled with little warning. Flight was rebooked through Ontario, California and connecting flight was delayed by over three hours. Frontier is living up to their Greyhound of the skies reputation for sure.

I purchased a carry on bag online…was supposed to cost $72 but after a whole slew of bs charges, the total was over $175.00. Because of these hidden charges, I will not even consider flying Frontier ever again. It’s just not worth the hassle. I’m scratching this company off my list forever.

Book cheap flights from St. Louis to San Juan

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from St. Louis to San Juan found on KAYAK in the last 72 hours.
6/1sáb.
2 stopsSpirit Airlines
22h 30mSTL-SJU
$108
5/18sáb.
1 stopFrontier
7h 44mSTL-SJU
$109
5/21mar.
1 stopFrontier
14h 03mSTL-SJU
$122
8/20mar.
1 stopSpirit Airlines
7h 37mSTL-SJU
$124
6/1sáb.
1 stopFrontier
9h 49mSTL-SJU
$141
6/1sáb.
3 stopsSpirit Airlines
28h 06mSTL-SJU
$142
8/29jue.
1 stopAmerican Airlines
16h 40mSTL-SJU
$159
8/19lun.
2 stopsAmerican Airlines
10h 41mSTL-SJU
$161
8/20mar.
3 stopsUnited Airlines
19h 27mSTL-SJU
$319
8/19lun.
3 stopsUnited Airlines
19h 25mSTL-SJU
$328

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Last minute flights from St. Louis to San Juan

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from St. Louis to San Juan that are departing in the next 10 days.
5/13lun.
multi-stopFrontier
12h 27mSTL-SJU
5/18sáb.
multi-stopFrontier
9h 50mSJU-STL
$278
5/13lun.
multi-stopFrontier
15h 30mSTL-SJU
5/17vie.
multi-stopFrontier
14h 10mSJU-STL
$308
5/10vie.
multi-stopFrontier
14h 32mSTL-SJU
5/14mar.
multi-stopFrontier
25h 31mSJU-STL
$337
5/10vie.
multi-stopFrontier
14h 32mSTL-SJU
5/13lun.
multi-stopFrontier
12h 02mSJU-STL
$398
5/10vie.
multi-stop
24h 08mSTL-SJU
5/13lun.
multi-stop
14h 38mSJU-STL
$534
5/10vie.
multi-stop
27h 29mSTL-SJU
5/13lun.
multi-stop
14h 38mSJU-STL
$557
5/13lun.
multi-stopAmerican Airlines
10h 10mSTL-SJU
5/18sáb.
multi-stopAmerican Airlines
6h 55mSJU-STL
$613
5/13lun.
multi-stopAmerican Airlines
10h 10mSTL-SJU
5/17vie.
multi-stopAmerican Airlines
9h 17mSJU-STL
$614
5/13lun.
multi-stopUnited Airlines
11h 47mSTL-SJU
5/17vie.
multi-stopUnited Airlines
10h 12mSJU-STL
$827
5/10vie.
multi-stopUnited Airlines
11h 47mSTL-SJU
5/13lun.
multi-stopUnited Airlines
15h 41mSJU-STL
$851

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St. Louis - San Juan Flights

Departure:

St. Louis (undefined)United States

Destination:

San Juan (SJU)Puerto Rico

Return flight deals:

San Juan - St. Louis

Cabin classes: