$84 Find Cheap Flights from Islip to Puerto Rico

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 11/12. 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

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Flight Deals

Book Cheap Islip to Puerto Rico Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Islip to Puerto Rico 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 Puerto Rico

Sat, Nov 15 - Sat, Dec 6
Frontier Logo
4:58 pm - 2:54 amISP-SJU
8h 56m1 stop
Frontier Logo
8:00 am - 3:10 pmSJU-ISP
8h 10m1 stop
$168Frontier
Find Deal
Sun, Mar 1 - Wed, Mar 4
Frontier Logo
1:10 pm - 11:37 pmISP-SJU
9h 27m1 stop
Frontier Logo
3:55 am - 9:47 amSJU-ISP
6h 52m1 stop
$246Frontier
Find Deal
Wed, Nov 12 - Sun, Nov 16
Frontier Logo
4:58 pm - 2:54 amISP-SJU
8h 56m1 stop
Frontier Logo
10:39 pm - 10:37 amSJU-ISP
12h 58m1 stop
$266Frontier
Find Deal
Wed, Jan 21 - Thu, Jan 22
JetBlue Logo
9:40 am - 6:35 pmISP-SJU
7h 55m1 stop
JetBlue Logo
6:00 am - 11:35 amSJU-ISP
6h 35m1 stop
$268JetBlue
Find Deal
Sat, Jan 24 - Fri, Jan 30
JetBlue Logo
11:00 am - 7:19 pmISP-SJU
7h 19m1 stop
JetBlue Logo
6:00 am - 11:35 amSJU-ISP
6h 35m1 stop
$274JetBlue
Find Deal
Thu, Jan 15 - Thu, Jan 22
Frontier Logo
8:15 pm - 12:46 amISP-SJU
27h 31m1 stop
Frontier Logo
11:05 am - 10:40 amSJU-ISP
24h 35m1 stop
$286Frontier
Find Deal
Thu, Nov 20 - Sun, Nov 23
Frontier Logo
10:02 am - 5:57 pmISP-SJU
6h 55m1 stop
Frontier Logo
7:11 am - 10:49 pmSJU-ISP
16h 38m2 stops
$289Frontier
Find Deal
Mon, Nov 17 - Sun, Nov 23
Frontier Logo
4:58 pm - 2:54 amISP-SJU
8h 56m1 stop
Frontier Logo
7:11 am - 10:49 pmSJU-ISP
16h 38m2 stops
$290Frontier
Find Deal
Sat, Jan 24 - Fri, Jan 30
Southwest Logo
12:15 pm - 12:10 amISP-SJU
10h 55m2 stops
Southwest Logo
6:10 am - 4:15 pmSJU-ISP
11h 05m1 stop
$320Southwest
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Sat, Jan 24 - Thu, Jan 29
Multiple Airlines Logo
11:50 am - 9:56 amISP-SJU
21h 06m2 stops
Multiple Airlines Logo
3:55 am - 10:40 amSJU-ISP
7h 45m1 stop
$324Multiple Airlines
Find Deal
Booking Insights

KAYAK's insights & trends for Islip to Puerto Rico flights

Get data-powered insights and trends into flights from Islip to Puerto Rico 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 Puerto Rico?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Islip to Puerto Rico, 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 Puerto Rico is February, when tickets cost $206 (return) on average. On the other hand, the most expensive months are October and December, when the average cost of round-trip tickets is $943 and $673 respectively.

Good to know

Low seasonJuly
Cheapest flight$84
Best time to beat the crowds with an average 19% drop in price.
Most popular time to fly and prices are also 34% 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 from Islip to Puerto Rico 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 from Islip to Puerto Rico with an airline and back 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 from Islip to Puerto Rico up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to Puerto Rico?

    The cheapest time of day to fly to Puerto Rico is generally at night, when round-trip flights cost $208 on average. Morning departures are around 27% cheaper than evening flights, on average. The most expensive time of day to fly to Puerto Rico is generally in the evening, which is peak travel time and where the average cost of a ticket is $390.

Reviews of the top 3 airlines serving 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.
8.0
SouthwestOverall score based on 4242 reviews
8.0Comfort
7.0Food
7.5Entertainment
8.1Boarding
8.6Crew
Airline reviews

Ever since Southwest starting charging for bags, passengers don't want to pay to check their bags, so the gate agents have to beg people to check their roller bags now because there's "not enough space". This was a terrible business move by Southwest.

8.0 ExcellentGreg, Oct 2025OAK - BUR
Read more Southwest reviews

Ever since Southwest starting charging for bags, passengers don't want to pay to check their bags, so the gate agents have to beg people to check their roller bags now because there's "not enough space". This was a terrible business move by Southwest.

Full cans of soda would be nice. A choice between two snacks would be appreciated.

Tried watching free movie and it kept freezing so I couldn’t finish.

All was good. I just had a hard time getting connected to the WiFi/internet during the flight

Sacrament staff are always polite and helpful. Airport is easy to maneuver and boarding is straightforward.

Great flight. Outstanding Service. Southwest was able to put us on a direct flight to Denver when the connection could have been affected by a later arrival to Baltimore. The direct flight was less expensive that the flight with the connection in Baltimore.

Delays delays delays. Late taking off, late landing, wait for a gate, etc.

Boarded on time but once we were ready for take off, the crew determined that, although every seat was taken, somehow someone was on the wrong flight. Delay, delay delay, announcements and ended up with one person checking EVERY ID against their passenger Manifest only to figure out it was a "clerical error." We departed 54 minutes late causing me to run in the St. Louis Airport to make my connection and lose the priority boarding spot I had paid for. Unnecessary delay.

I was re-booked onto another flight because my original flight was delayed and I would have missed my connector. I ended up in the “C” group after paying extra to be in the “A “ group on the original flight. At least if you’re going to re-book people, re-book them into the same group.

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

Plane was in bad shape. TV’s and WiFi didn’t work. Plane need a refresh. Not enough room for bags.

Everything was great. I liked the text updates so that I never miss a gate change & I have all the latest info.

No internet on a flight over three hours in this age is criminal. Staff inattentive and dismissive

Worst flight experience ever flights canceled. JetBlue told us just did not even bother standing in line to come back in one and a half hours then without any information we had to go pick up all of our luggage and spend over $2000 in accommodation just to get home. JetBlue said that the next flight available for us to get home would be three days later. Absolutely absurd hasn’t offered to give us any compensation do not fly JetBlue horrible company. They said it was based on the weather and the weather is great in all locations that we would’ve been flying to total hoax. I think it’s a conspiracy theory.

flight was delayed for hours with no explanation. The plane was a very old aircraft.

Communication since no reason or explanation was given for 3 hrs delay

The flight departed more than 1 hour late. Leg room is bigger than most airlines

Excellent. Although they used to greet me as a mosaic member and provide a free drink, early boarding helps me to keep coming back to JetBlue.

No music app working: no economy meal on five hour flight; hour on tarmac at the end waiting for a gate. Flight itself was smooth and easy.

Communication with the customer and stay is important. Staff off with a minor inconvenience but it worked out of course. Also this was a very old Mint Class plane. They snuck this one in on us. The updated aircraft are much better.

Terrible. The canceled my entire flight when I requested a refund for a trip frontier canceled trip one way.

Boarding was on time and plane departed as scheduled. There are obviously no amenities (food, drink, entertainment) on Frontier, but there also didn't seem to be any issues with luggage space either.

Inbound plane was on time and flight departed on time with no issues while boarding.

I knew going into this that Frontier, being a low cost carrier, would be pretty bare bones and charge for most extras but this was made up for by the fact that the airplane was a reasonably new Airbus, every employee was great and best of all, Everett Washington is an amazing airport - thanks Frontier for flying there!!!

i was unable to check in the flight. refund requested

It was well done. It was my first time flying with them and I was nervous b/c I have heard of many cancelled and/or delray flights. Everything went smoothly.

Just know that everything, and I mean everything is “ala cart”. 60$ just to put something in the overhead bin. I will never fly Frontier again nor do I recommend them to anyone else.

The single worst check in experience I could imagine. I’ll never do any business with Frontier or any affiliated company

Too many extra fees, uncomfortable, little leg room. Will not recommend this airline.

Everyone seemed to be in zone 1 for boarding. Maybe break it up a little. Otherwise, smooth flight.

Everything you need to know for your flight from Islip to Puerto Rico

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