ISP - SJU

$160 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 8/28. 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
$336
Frontier
Wed 10/21Wed 10/28
ISP - SJU • 1 stop
Cheapest one-way
$160
Multiple Airlines
Fri 8/28
ISP - SJU • 2 stops
Top airlines
Cheapest • from $336 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Islip and San Juan. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $396 (round-trip)
Shortest trip • 6h 31m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 100% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
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

Wed, Oct 21 - Wed, Oct 28
Frontier Logo
4:13 pm - 4:34 pm
ISP
-
SJU
24h 21m
1 stop
Frontier Logo
6:05 am - 2:33 pm
SJU
-
ISP
8h 28m
1 stop
$336Frontier
Thu, Aug 20 - Tue, Aug 25
Frontier Logo
7:09 pm - 8:11 am
ISP
-
SJU
13h 02m
1 stop
Frontier Logo
12:11 pm - 9:53 am
SJU
-
ISP
21h 42m
1 stop
$350Frontier
Mon, Nov 2 - Tue, Nov 10
Frontier Logo
3:43 pm - 2:50 am
ISP
-
SJU
10h 07m
1 stop
Frontier Logo
7:05 am - 2:33 pm
SJU
-
ISP
8h 28m
1 stop
$355Frontier
Sat, Sep 5 - Tue, Sep 8
Frontier Logo
10:57 am - 7:52 pm
ISP
-
SJU
8h 55m
1 stop
Frontier Logo
3:00 am - 9:33 am
SJU
-
ISP
6h 33m
1 stop
$356Frontier
Thu, Aug 20 - Tue, Aug 25
Southwest Logo
1:15 pm - 10:10 pm
ISP
-
SJU
8h 55m
2 stops
Southwest Logo
5:15 am - 4:55 pm
SJU
-
ISP
11h 40m
2 stops
$364Southwest
Tue, Aug 11 - Tue, Aug 18
Multiple Airlines Logo
4:58 pm - 9:19 am
ISP
-
SJU
16h 21m
1 stop
Multiple Airlines Logo
8:57 pm - 9:53 am
SJU
-
ISP
12h 56m
1 stop
$369Multiple Airlines
Fri, Aug 21 - Sat, Aug 29
Frontier Logo
7:46 pm - 12:56 am
ISP
-
SJU
29h 10m
1 stop
Frontier Logo
5:37 pm - 7:01 pm
SJU
-
ISP
25h 24m
1 stop
$370Frontier
Fri, Jul 24 - Tue, Jul 28
Frontier Logo
10:57 am - 9:43 pm
ISP
-
SJU
10h 46m
1 stop
Frontier Logo
8:37 pm - 9:53 am
SJU
-
ISP
13h 16m
1 stop
$376Frontier
Tue, Aug 11 - Tue, Aug 18
Multiple Airlines Logo
6:00 am - 11:58 pm
ISP
-
SJU
17h 58m
2 stops
Multiple Airlines Logo
8:57 pm - 9:53 am
SJU
-
ISP
12h 56m
1 stop
$384Multiple Airlines
Thu, Aug 6 - Fri, Aug 14
Multiple Airlines Logo
6:00 am - 8:27 pm
ISP
-
SJU
14h 27m
1 stop
Multiple Airlines Logo
3:10 am - 9:53 am
SJU
-
ISP
6h 43m
1 stop
$386Multiple Airlines
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.

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 July, where tickets cost $0 (return) on average. On the other hand, the most expensive months are February and April, where the average cost of round-trip tickets is $876 and $686 respectively.

Good to know

Cheapest flight$160
Most popular time to fly with an average 23% increase in price.
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 5 days, the lowest price for a flight from Islip to San Juan Luis Munoz Marin Intl Airport was $160 for a one-way ticket and $336 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 $556 and an overall rating of 7.9, Southwest is the most popular choice. Frontier is also a great choice for the route, with an average price of $356 and an overall rating of 5.6.

  • 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.
7.9
SouthwestOverall score based on 4246 reviews
7.0Food
7.5Entertainment
8.0Comfort
8.6Crew
8.1Boarding
Airline reviews

Flight coming out of Buffalo was delayed, so we had to be rescheduled on another flight from Baltimore to Phoenix which means we had a long layover and got home 3.5 hours late. Shuttle to parking stopped at 10pm, so we had to pay for an Uber to the parking lot and got charged an extra day of parking since it was after midnight. Not the best experience. Long day!

2.0 MediocreDawn, Jun 2026
BUF - BWI
Read more Southwest reviews

Flight coming out of Buffalo was delayed, so we had to be rescheduled on another flight from Baltimore to Phoenix which means we had a long layover and got home 3.5 hours late. Shuttle to parking stopped at 10pm, so we had to pay for an Uber to the parking lot and got charged an extra day of parking since it was after midnight. Not the best experience. Long day!

We had a 5 hour delay on the tarmac in Baltimore

Airline travel is always too cramped to really be pleasant, but the cabin crew on this flight did a pretty good job of making up for it by putting on some music during boarding and sprinkling a few funny remarks into the safety briefing and announcements, and just generally being friendly and helpful. It definitely reminded me of why I prefer the in-flight experience on Southwest!

Flight was delayed due to plane not passing inspection And one of the crew had to time out and we had to wait for another one A 3 hour delay

It was one and half hour late... Not sure if any other experience matters.

It was 2 hours 45 minutes late, for no apparently clear reason.

It went well. Plane wasn't full. Will be great when assigned seating is in place

My bag was damaged and is now missing a wheel. I tried to buy a claim in on the website but it would not accept my confirmation # for submission. Other than that, everything else was good!

it was great. the crew is exceptional. the flight was on time.

As always it was a pleasure to fly on southwest.

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

First of all we hade waited 3 hours in the airplane waiting to leave. Second the return schedule was changed and it messed up my entire vaction. I won't buy never again another flight and recommend to nobody traveling with them.

The worst. They don’t follow procedure for boarding per group. Flight got delayed for no understandably reasons, they changed our destination from PR to Miami, left us inside a plane for more than 8 hours, then cancelled flight in Miami leaving us stranded. Poorly managed re-accommodation for a new flight and overnight stay so I have to spend in a new ticket and my own hotel room to been able to get to my office next day. Lost 2 days of work and as a doctor, patients loosing their appointments. to other flights and besides

I liked the price of the flight and the chance to buy a seat with no person seated in the middle seat.. Also the flight was right on time.

The flight left over two hours late. They charged me $180 to bring a carry on. There was an error with the spelling of my name and Frontair agent lied that I would need to pay $200 for her to fix the spelling, and pressured me that if I don't do it quick I would lose the flight. I called back and another agent said it costs $75 to fix. All in all, this company is a complete scam.

I took my first and last flight with FRONTIER. The seats are not able to be reclined so it’s not a very comfortable experience when you take a flight of 3 hours or longer. You must pay for your luggage either carry on or check in, so taking all this in consideration at the end what you think you’re saving your paying in services that should be included. Not a beverage in sight. . You’re seriously better off getting on a proper airline such as Delta, AA, United, etc.

Horrible and worse flight ever. Was left at the airport in SJU by my flight to JFK after several delay at Santa Domingo. Will never recommend Frontier to any one. After leaving, frontier customer service ask me to rebook and pay for another flight to from SJU to JFK. Worse airline ever. You pay for everything with frontier airline.

Frontier notifying me earlier of flight delay of over 2 hours.

Crew was excellent. Plane was small cramped Airbus A320. Seats were narrow.

Excellent crew. WE all know Frontier its a low cost airline but the travel time was about 30 minutes and the crew was phenomenal. I was with a group of 10 more and we are enjoy our flight. The only issue was in SJU waiting for the luggage.

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

Information on your arrival and departure airports