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Find cheap flights from Islip to Puerto Rico from $135

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 Puerto Rico departing on 6/25. 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
Sat 6/8
Sat 6/15

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Good to know

Low season

November

High season

August

Cheapest flight

$135
Best time to beat the crowds with an average 59% drop in price.
Most popular time to fly and prices are also 23% lower on average.
Flight from Islip to San Juan

FAQs - booking Puerto Rico flights

  • How does KAYAK find such low prices on flights from Islip to Puerto Rico?

    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 Puerto Rico.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Puerto Rico 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 Puerto Rico?

    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 Puerto Rico with an airline and back to Islip with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Islip to Puerto Rico?

    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 Puerto Rico 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 tips for finding cheap flights to Puerto Rico

  • Morning departure is around 43% more expensive than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

Top airline flying from Islip to Puerto Rico

 
Need help choosing which airline to fly with from Islip to Puerto Rico? 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 4088 reviews
7.1Crew
4.9Entertainment
5.8Comfort
5.2Food
6.6Boarding
Airline reviews

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!!!!!

2.0 MediocreJudi, May 2024PHX - PDX
Read more about Frontier reviews

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 Islip to Puerto Rico

Recent round-trip flight deals

8/22Thu
1 stopFrontier
8h 38mISP-SJU
8/26Mon
1 stopFrontier
12h 17mSJU-ISP
$264
6/16Sun
1 stopFrontier
9h 19mISP-SJU
6/19Wed
1 stopFrontier
28h 32mSJU-ISP
$281
5/21Tue
1 stopFrontier
9h 20mISP-SJU
5/28Tue
1 stopFrontier
11h 41mSJU-ISP
$288
7/12Fri
1 stopFrontier
8h 38mISP-SJU
7/15Mon
1 stopFrontier
10h 03mSJU-ISP
$294
6/27Thu
1 stopFrontier
9h 07mISP-SJU
7/1Mon
1 stopFrontier
28h 32mSJU-ISP
$298
7/12Fri
1 stopFrontier
23h 50mISP-SJU
7/14Sun
1 stopFrontier
29h 18mSJU-ISP
$303
6/16Sun
1 stopFrontier
9h 19mISP-SJU
6/20Thu
1 stopFrontier
24h 44mSJU-ISP
$305
5/21Tue
1 stopFrontier
13h 05mISP-SJU
7/13Sat
1 stopFrontier
10h 49mSJU-ISP
$328
7/12Fri
3 stops
27h 25mISP-SJU
7/14Sun
2 stops
14h 37mSJU-ISP
$604
7/12Fri
2 stops
21h 44mISP-SJU
7/14Sun
2 stops
14h 37mSJU-ISP
$636

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Recent one-way flight deals

6/25Tue
1 stopFrontier
10h 29mISP-SJU
$135
8/4Sun
1 stopFrontier
12h 43mISP-SJU
$159
6/22Sat
1 stopFrontier
9h 13mISP-SJU
$219
5/28Tue
1 stopFrontier
13h 05mISP-SJU
$249
6/29Sat
1 stopFrontier
9h 13mISP-SJU
$289
11/1Fri
1 stopFrontier
8h 38mISP-SJU
$339
6/19Wed
1 stopFrontier
9h 13mISP-SJU
$694

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Last minute flights from Islip to Puerto Rico

Last minute flight, train and bus deals

5/14Tue
multi-stopFrontier
12h 48mISP-SJU
5/15Wed
multi-stopFrontier
12h 02mSJU-ISP
$179
5/14Tue
multi-stopFrontier
7h 51mISP-SJU
5/18Sat
multi-stopFrontier
11h 55mSJU-ISP
$244
5/13Mon
multi-stopFrontier
13h 43mISP-SJU
5/17Fri
multi-stopFrontier
12h 25mSJU-ISP
$248
5/14Tue
multi-stopFrontier
12h 48mISP-SJU
5/15Wed
multi-stopFrontier
12h 02mSJU-ISP
$253
5/12Sun
multi-stopFrontier
11h 57mISP-SJU
5/19Sun
multi-stopFrontier
11h 41mSJU-ISP
$278
5/14Tue
multi-stopFrontier
29h 45mISP-SJU
5/17Fri
multi-stopFrontier
28h 58mSJU-ISP
$296
5/12Sun
multi-stop
12h 54mISP-SJU
5/19Sun
multi-stop
22h 33mSJU-ISP
$777
5/12Sun
multi-stop
12h 54mISP-SJU
5/19Sun
multi-stop
18h 57mSJU-ISP
$792
5/12Sun
multi-stop
22h 27mISP-SJU
5/19Sun
multi-stop
18h 57mSJU-ISP
$854

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Islip - Puerto Rico Flights

Departure:

Islip (ISP)United States

Return flight deals:

Puerto Rico - Islip

Cabin classes:

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