ISP - SJU

$96 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 4/17. 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
$192
Frontier
Wed 4/8Wed 4/15
ISP - SJU • 1 stop
Cheapest one-way
$96
Frontier
Fri 4/17
ISP - SJU • 1 stop
Top airlines
Frontier
Cheapest • from $192 (round-trip)
Southwest
Best reviews • 8.0 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
Fort Lauderdale (FLL)
Cheapest • Avg $290 (round-trip)
Baltimore (BWI)
Shortest trip • 6h 35m (one-way)
Insights
Insights
Insights
Insights
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, Apr 8 - Wed, Apr 15
Frontier Logo
5:28 pm - 2:01 am
ISP
-
SJU
8h 33m
1 stop
Frontier Logo
6:30 am - 9:33 am
SJU
-
ISP
27h 03m
1 stop
$192Frontier
Sat, Apr 11 - Wed, Apr 15
Frontier Logo
5:45 am - 12:51 am
ISP
-
SJU
19h 06m
1 stop
Frontier Logo
6:30 am - 9:33 am
SJU
-
ISP
27h 03m
1 stop
$209Frontier
Sat, Apr 11 - Wed, Apr 15
Frontier Logo
8:39 pm - 7:56 am
ISP
-
SJU
11h 17m
1 stop
Frontier Logo
6:30 am - 9:33 am
SJU
-
ISP
27h 03m
1 stop
$213Frontier
Thu, Apr 30 - Sun, May 3
Frontier Logo
4:07 pm - 2:01 am
ISP
-
SJU
9h 54m
1 stop
Frontier Logo
6:30 am - 9:13 am
SJU
-
ISP
26h 43m
1 stop
$234Frontier
Wed, Jun 3 - Wed, Jun 10
Frontier Logo
10:03 am - 1:56 am
ISP
-
SJU
15h 53m
1 stop
Frontier Logo
9:15 am - 9:08 am
SJU
-
ISP
23h 53m
1 stop
$235Frontier
Fri, Apr 17 - Mon, Apr 20
Frontier Logo
4:07 pm - 2:01 am
ISP
-
SJU
9h 54m
1 stop
Frontier Logo
7:15 am - 7:36 pm
SJU
-
ISP
12h 21m
1 stop
$254Frontier
Mon, Mar 23 - Fri, Apr 3
Frontier Logo
1:22 pm - 1:58 am
ISP
-
SJU
12h 36m
1 stop
Frontier Logo
3:16 am - 10:30 am
SJU
-
ISP
7h 14m
1 stop
$258Frontier
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
$274Frontier
Thu, Apr 30 - Sun, May 3
Frontier Logo
4:07 pm - 2:01 am
ISP
-
SJU
9h 54m
1 stop
Frontier Logo
6:30 am - 9:13 am
SJU
-
ISP
26h 43m
1 stop
$295Frontier
Mon, Mar 23 - Thu, Mar 26
Frontier Logo
1:22 pm - 10:45 pm
ISP
-
SJU
9h 23m
1 stop
Frontier Logo
5:30 am - 10:13 am
SJU
-
ISP
28h 43m
1 stop
$296Frontier
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.

Which airlines provide the cheapest flights from Islip to San Juan?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Islip to San Juan were found on Frontier ($192) and Southwest ($352).

Which airlines fly non-stop between Islip and San Juan Luis Munoz Marin Intl Airport?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for round-trip flights from Islip to San Juan Luis Munoz Marin Intl Airport.

There is just one airline that flies from Islip to San Juan Luis Munoz Marin Intl Airport direct and that is Frontier. The best round-trip deal found from Frontier for the route is $106.

Good to know

Low seasonFebruary
Cheapest flight$96
Best time to beat the crowds with an average 62% drop in price.
Most popular time to fly and prices are also 8% 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 $96 for a one-way ticket and $192 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 $563 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 $274 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 4304 reviews
7.0Food
8.1Boarding
8.0Comfort
7.5Entertainment
8.6Crew
Airline reviews

Flight boarded late after announcing on time boarding. Flight arrived only a little late despite late departure. Had trouble connecting to WiFi

4.0 OkayEmma, Mar 2026
LAX - PHX
Read more Southwest reviews

Flight boarded late after announcing on time boarding. Flight arrived only a little late despite late departure. Had trouble connecting to WiFi

Mediocre. Boarding is now unpleasant. The employees, once friendly and nice, are now regularly speaking sternly to passengers, badgering them to do things right so they can take off on time and gate check bags because they don't have enough overhead bin space. The pretzel snack was crushed flat and broken into even smaller pieces, which happens frequently lately. Drink service was suspended before they reached my row.

The last 3 flights between BWI and BDL canceled the beverage service mid- way. Just say up front that the fight is too short. Thanks!

It was canceled. Supposedly weather. But there was no snow in Baltimore. At least we found out before driving to airport

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!!

The Southwest experience has definitely taken a dive from its early days. You can no longer deferentiate from other airlines. Air travel is too expensive. Southwest is no longer budget friendly. They have lost me as a loyal customer.

Flight was hours late, unable to sit next to spouse, I have had so much better experiences. Substantially better, only saving grace was that it was a short flight.

An entire day of delays. Cost lots of money. Meals and a hotel.

The WiFi and crew on the plane were good, however, the boarding experience was awful. I paid for the Choice Preferred and was boarded in group 5 so all overhead storage was full. They found room for our luggage, but further back making getting off the plane a nightmare. Also, we were in row 6 and the seats were extremely uncomfortable. Both my daughter and I had no leg room and couldn’t wait to get off the plane.

The charges were ridiculous for an hour flight and the turbulence was very scary.

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.

Frontier.. nickel and dime add-ons. Flight late, on time, late again, last minute gate change, arrival gate required a shuttle to the terminal. They sure keep you guessing.. if you like a little chaos and airport anxiety, this is the airline for you!

This is my second time flying with Frontier. My current experience was very favorable. The staff from the gate to the plane was friendly, warm and professional. The food options lacked in my opinion. This area needs some attention in my opinion.

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.

There was no food and no entertainment, so I'm not sure why these are even in the survey, as my understanding is frontier does not ever offer food without a few, not even a snack, and there are no screens so unless the flight safety talk is our entertainment why ask how we liked it?. One of the flight attendants say in the back of the plane as people filed in to their seats, yelling orders about where to put baggage and telling people to hurry up. It was the least professional experience I've ever had on a flight.

Very well recently! Frontier is improving and less harrassing customer on luggages! Positive!

Good for a budget airline! It was easy to get on, staff was really nice. Can’t say anything about the food or entertainment because it wasn’t available, which is fine.

I am writing to express my disappointment with my recent Frontier Airlines flight. I was charged $99 at the gate because my bag was said to be too large, yet once onboard there was no available overhead bin space, and I was required to place the bag under the seat in front of me anyway. This made the charge feel unnecessary and unfair. Additionally, before the flight even took off, I was asked to move from the seat I paid for into a middle seat so another passenger and her cat could have my seat to themselves. I was not offered compensation or an explanation for being moved from a paid seat. Between the unexpected bag fee and being forced to give up my seat, this experience fell well below acceptable customer service standards. I would appreciate a review of this situation and appropriate compensation.

It was costly and difficult to check in. $85 to take a small suitcase with me, carry on or checked and $75 on the return trip, Plus $25 if I didn't check my self in check in $25, because I couldn't do it on the kiosk. Small very uncomfortable seats, waited on the runway for near an hour each way. It was my worst flight to date.

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

Information on your arrival and departure airports