ISP - SJU

$88 Find Cheap Flights from Islip 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 Islip to San Juan departing on 4/23. 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 San Juan Luis Munoz Marin Intl Airport

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

Cheapest round-trip
$176
Typical prices: $633-$412
Frontier
Fri 4/24Fri 5/8
ISP - SJU • 1 stop
Cheapest one-way
$88
Frontier
Thu 4/23
ISP - SJU • 1 stop
Nonstop flights
Not available
There are currently no direct flights between Islip and San Juan. You'll need at least 1 connection.
Insights
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Top layover airports
Cheapest • Avg $396 (round-trip)
Shortest trip • 6h 35m (one-way)
Insights
Insights
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Insights
When to travel
Cheapest • 42% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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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 San Juan!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Islip to San Juan (ISP-SJU)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Islip 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 for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Islip to San Juan

Fri, Apr 24 - Fri, May 8
Frontier Logo
4:07 pm - 2:01 am
ISP
-
SJU
9h 54m
1 stop
Frontier Logo
3:03 am - 10:05 am
SJU
-
ISP
7h 02m
1 stop
$176Frontier
Mon, Apr 20 - Thu, Apr 30
Frontier Logo
8:31 pm - 9:00 am
ISP
-
SJU
12h 29m
1 stop
Frontier Logo
6:30 am - 9:13 am
SJU
-
ISP
26h 43m
1 stop
$186Frontier
Thu, Apr 23 - Sun, Apr 26
Frontier Logo
8:31 pm - 2:27 pm
ISP
-
SJU
17h 56m
1 stop
Frontier Logo
6:30 am - 9:28 am
SJU
-
ISP
26h 58m
1 stop
$194Frontier
Mon, Apr 27 - Wed, May 6
Frontier Logo
8:31 pm - 9:30 am
ISP
-
SJU
12h 59m
1 stop
Frontier Logo
3:03 am - 10:05 am
SJU
-
ISP
7h 02m
1 stop
$196Frontier
Thu, Apr 16 - Sun, Apr 19
Frontier Logo
8:31 pm - 11:29 pm
ISP
-
SJU
26h 58m
1 stop
Frontier Logo
6:30 am - 9:13 am
SJU
-
ISP
26h 43m
1 stop
$204Frontier
Thu, Jun 4 - Mon, Jun 8
Frontier Logo
11:00 am - 2:08 am
ISP
-
SJU
15h 08m
1 stop
Frontier Logo
6:09 pm - 3:56 pm
SJU
-
ISP
21h 47m
1 stop
$212Frontier
Mon, Apr 13 - Wed, Apr 22
Frontier Logo
5:45 am - 12:10 am
ISP
-
SJU
18h 25m
1 stop
Frontier Logo
10:59 am - 9:33 am
SJU
-
ISP
22h 34m
1 stop
$215Frontier
Thu, Apr 30 - Sun, May 3
Frontier Logo
4:07 pm - 10:56 pm
ISP
-
SJU
6h 49m
1 stop
Frontier Logo
6:30 am - 9:13 am
SJU
-
ISP
26h 43m
1 stop
$216Frontier
Mon, Apr 13 - Sat, Apr 18
Frontier Logo
5:45 am - 9:00 am
ISP
-
SJU
27h 15m
1 stop
Frontier Logo
3:19 pm - 9:13 am
SJU
-
ISP
17h 54m
1 stop
$225Frontier
Sun, Apr 12 - Mon, Apr 13
Frontier Logo
12:08 pm - 12:02 am
ISP
-
SJU
11h 54m
1 stop
Frontier Logo
5:45 am - 6:49 pm
SJU
-
ISP
13h 04m
1 stop
$228Frontier
Booking Insights

KAYAK's insights & trends for Islip to San Juan flights

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

How much is a round-trip flight from Islip, New York to San Juan Luis Munoz Marin Intl Airport?

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

What is the cheapest month to fly from Islip 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 round-trip flights from Islip 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 Islip to San Juan Luis Munoz Marin Intl Airport is January, where tickets cost $290 (return) on average. On the other hand, the most expensive months are February and October, where the average cost of round-trip tickets is $871 and $608 respectively.

Good to know

Low seasonMarch
Cheapest flight$88
Best time to beat the crowds but there is an average 16% increase in price.
Most popular time to fly and prices are also 26% lower on average.
Flight from Islip to San Juan

When to book flights from Islip to San Juan

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

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

    In the last 3 days, the lowest price for a flight from Islip to San Juan Luis Munoz Marin Intl Airport was $88 for a one-way ticket and $176 for a round-trip.

  • Do I need a passport to fly between Islip and San Juan?

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

  • Which airports will I be using when flying from Islip to San Juan?

    Islip airport is called Islip Long Island and the only airport in San Juan is San Juan Luis Munoz Marin Intl.

  • Which aircraft models fly most regularly from Islip to San Juan?

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

  • Which is the best airline for flights from Islip to San Juan, Southwest or Frontier?

    The two airlines most popular with KAYAK users for flights from Islip to San Juan are Southwest and Frontier. With an average price for the route of $535 and an overall rating of 8.0, Southwest is the most popular choice. Frontier is also a great choice for the route, with an average price of $325 and an overall rating of 5.7.

  • How does KAYAK find such low prices on flights from Islip 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 Islip to San Juan.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Juan from Islip 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 Islip 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 Islip with another airline. Booking your flights between Islip 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 Islip 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 Islip up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airlines flying from Islip to San Juan

 
See real verified KAYAK customer reviews for airlines flying from Islip 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 Islip 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
SouthwestOverall score based on 4344 reviews
7.0Food
8.6Crew
8.1Boarding
7.5Entertainment
8.0Comfort
Airline reviews

The Air hostess were very rude on my flight from Houston to Austin . Their regular communication itself felt a they are shouting at people.

4.0 Okaysangeetha, Apr 2026
AUS - SJC
Read more Southwest reviews

The Air hostess were very rude on my flight from Houston to Austin . Their regular communication itself felt a they are shouting at people.

Communication about the delayed flight was poor. We were told to move gates three times but that was bad information. We went from gate 128 to gate 126 and then to gate 123 and back to gate 126. Communication about the delay was bad. Ended up being 1 1/2 hour late getting home.

Plane was late. Zero service for 2+ hour flight and it was not that bumpy.

It was good from LAX to Phoenix, But the connection in Phoenix to Tulsa was not that great. The staff on both flights were great. The choice of free entertainment was ok nothing to brag about. The 45 min delay because of some electrical issue wasn't great from Phoenix to Tulsa. We sat there with hardly any air, The seat I had was between windows so the side of the plane pushed in on you. My being a bigger man it then made the seating area uncomfortable. The seats on the plane had no power to connect to recharge your phone or anything. I would recommend that they should look into a slot or clamp to hold your phone to enjoy while watching the entertainment choices hands-free. Also make it possible to raise the inner seat by the window be able to raise the arm rest up to make more room for larger people to set more comfortably. I would also say other then that stop price gouging the airfare or nickel and diming everything. Not fair for people having to fly for emergencies and be paying for higher prices due to the season or holidays. Your making your money either way and the cost of flying is still going to be the same regardless if there's 100 people or 200 people.

Had a great flight. Delayed takeoff, but comfortable. Snacks were good.

Love them will get a Southwest card to track my points and keep flying with them. My family and I were pleased with the services.

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.

Southwest continues to do less for more money. Flight attendants used to be fun and friendly. But now it’s like they don’t even see you. Such a shame.

Great flight. Good snacks and drinks. Grateful it was free. The flight from Nashville to louisville, i think her name was Tracy (not sure that's right) super awesome, nice and cheerful. She really enjoyed being at work today! She was the person who scanned the boarding pass on flight wn941. She should be recommended for a raise !

I liked it better when you were truer to your roots Am paying more for less fun

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 !!!!!!!

The flight never took off and we spent 7 hours at the airport

Gate not determined until I got to the airport - hard to plan the trip to the airport.

Our flight was canceled. I will never use Kayak nor Frontier for travel again. The entire experience was a headache.

Everything you need to know for your flight from Islip to San Juan

Information on your arrival and departure airports