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ISP - SJU

$165 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 8/10. 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
Wed 7/10
Wed 7/17

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 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
In the last 7 days travelers have searched 42,898,604 times on KAYAK, and here is why:

Save 21% or moreCompare multiple travel sites with one search.

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Cheap flight deals 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 and deals for you by selecting your travel dates.
Choose your dates
11:22 am - 1:59 amISP-SJU
14h 37m1 stop
3:08 am - 7:40 amSJU-ISP
28h 32m1 stop
$188Frontier
Find Deal
Fri, Jun 21 - Sat, Jun 22
5:25 pm - 11:05 amISP-SJU
17h 40m1 stop
8:09 pm - 8:26 amSJU-ISP
12h 17m1 stop
$280Frontier
Find Deal
Fri, Aug 30 - Fri, Sep 6
4:46 pm - 1:59 amISP-SJU
9h 13m1 stop
10:15 pm - 7:40 amSJU-ISP
9h 25m1 stop
$298Frontier
Find Deal
Fri, Jun 21 - Fri, Jun 28
5:25 pm - 11:05 amISP-SJU
17h 40m1 stop
3:08 am - 8:45 pmSJU-ISP
17h 37m1 stop
$300Frontier
Find Deal
Fri, Aug 30 - Thu, Sep 5
8:55 pm - 9:21 amISP-SJU
12h 26m1 stop
10:15 pm - 8:38 amSJU-ISP
10h 23m1 stop
$310Frontier
Find Deal
Thu, Jul 4 - Fri, Jul 12
4:46 pm - 2:05 amISP-SJU
9h 19m1 stop
10:15 pm - 7:40 amSJU-ISP
9h 25m1 stop
$318Frontier
Find Deal
Sun, Jun 23 - Fri, Jun 28
11:22 am - 1:59 amISP-SJU
14h 37m1 stop
9:45 am - 10:29 amSJU-ISP
24h 44m1 stop
$324Frontier
Find Deal
Fri, Jun 21 - Sun, Jun 23
10:59 am - 9:47 pmISP-SJU
10h 48m1 stop
8:09 pm - 8:26 amSJU-ISP
12h 17m1 stop
$344Frontier
Find Deal
Sun, Aug 18 - Sun, Aug 25
1:57 pm - 6:51 pmISP-SJU
28h 54m3 stops
11:08 pm - 5:07 pmSJU-ISP
17h 59m2 stops
Fri, Jun 21 - Sun, Jun 23
1:57 pm - 6:51 pmISP-SJU
28h 54m3 stops
4:48 pm - 5:07 pmSJU-ISP
24h 19m3 stops
Fri, Jun 21 - Sun, Jun 23

Flights from Islip to San Juan - Travel Insights & Trends

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 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 September, where tickets cost $202 on average. On the other hand, the most expensive months are December and February, where the average cost of tickets is $454 and $372 respectively.

How far in advance should I book a flight from Islip 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 Islip 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 Islip to San Juan Luis Munoz Marin Intl Airport, you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 30 days before departure.

Good to know

Low season

November

High season

August

Cheapest flight

$165
Best time to beat the crowds with an average 58% drop in price.
Most popular time to fly and prices are also 22% 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 $165 for a one-way ticket and $188 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.

  • 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.

See more FAQs

Top airline 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.
6.2
FrontierOverall score based on 3969 reviews
6.5Boarding
5.1Food
4.9Entertainment
5.8Comfort
7.0Crew
Airline reviews

8 hr delay. had to buy another ticket with another airline

2.0 MediocreAnonymous, Jun 2024SFO - LAX
Read more about Frontier reviews

8 hr delay. had to buy another ticket with another airline

Four and a half hour delay in total. What frustrates me most is the poor communication and disorganization.

I appreciated the upgrade to free cary-on bag and seat selection at no charge

FRONTIER SUCKS! The agent downstairs tricked me into booking, just to get to the gate. At the gate, they told me they couldn't help. I then called Customer Service. They and the gate attendants kept blaming each other. Neither side was willing to help the customer.

The agent at check-in was strident, unwelcoming, and condescending to customers ahead of me.

Flight was delay 9hrs and nothing was provided at airport, had to go and get a room to sleep in, paid for Uber back and fort with no offers until we landed back home a 1hr later for a $75 voucher for a future flight.

Didn't like anything..entire crew was very rude to everyone on the flight. Plane old and the trays fall down on you the while time you're flying. Charged more for a carry on bag than for the plane ticket itself. Did make it from point a to point b, but worth the extra money to fly with another airline

9 hours of delay!! Was not able to check my luggage that I paid for!!!

It was delayed 9 hours for operational reasons, despite the plane arriving to the airport on time.

I am very disappointed with Frontier Airlines. They cancelled our flight because they couldn't find a crew member, and then didn't get us to our connecting flight. We had to cancel our whole vacation. We were promised flight and hotel vouchers, but they never sent them.

Book cheap flights from Islip to San Juan

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Islip to San Juan found on KAYAK in the last 72 hours.
8/10Sat
1 stopFrontier
13h 20mISP-SJU
$165
7/14Sun
1 stopFrontier
12h 22mISP-SJU
$175
7/9Tue
1 stopFrontier
8h 57mISP-SJU
$269
11/1Fri
1 stopFrontier
8h 38mISP-SJU
$339
7/6Sat
1 stopFrontier
9h 02mISP-SJU
$359
7/2Tue
1 stopFrontier
13h 00mISP-SJU
$440

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Last minute flights from Islip 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 Islip to San Juan that are departing in the next 10 days.
6/13Thu
multi-stopFrontier
9h 07mISP-SJU
6/15Sat
multi-stopFrontier
10h 50mSJU-ISP
$338
6/13Thu
multi-stopFrontier
9h 07mISP-SJU
6/15Sat
multi-stopFrontier
10h 50mSJU-ISP
$498
6/13Thu
multi-stopFrontier
9h 07mISP-SJU
6/16Sun
multi-stopFrontier
11h 12mSJU-ISP
$528

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Islip - San Juan Flights

Departure:

Islip (ISP)United States

Destination:

San Juan (SJU)Puerto Rico

Return flight deals:

San Juan - Islip

Cabin classes: