$88 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 4/11. 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

Sun, Apr 12 - Sat, Apr 18
Frontier Logo
7:59 pm - 8:00 pm
ISP
-
SJU
24h 01m
1 stop
Frontier Logo
8:00 am - 9:13 am
SJU
-
ISP
25h 13m
1 stop
$186Frontier
Mon, May 4 - Mon, May 4
Frontier Logo
4:07 pm - 10:48 pm
ISP
-
SJU
6h 41m
1 stop
Frontier Logo
3:03 am - 11:00 am
SJU
-
ISP
7h 57m
1 stop
$191Frontier
Thu, Apr 23 - Sun, Apr 26
Frontier Logo
8:31 pm - 11:29 pm
ISP
-
SJU
26h 58m
1 stop
Frontier Logo
6:30 am - 9:28 am
SJU
-
ISP
26h 58m
1 stop
$194Frontier
Fri, May 15 - Mon, May 18
Frontier Logo
11:00 am - 8:04 am
ISP
-
SJU
21h 04m
1 stop
Frontier Logo
3:03 am - 11:00 am
SJU
-
ISP
7h 57m
1 stop
$196Frontier
Sun, May 3 - Mon, May 4
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
$199Frontier
Fri, Apr 17 - Sun, Apr 19
Frontier Logo
8:31 pm - 12:59 pm
ISP
-
SJU
16h 28m
1 stop
Frontier Logo
10:49 am - 9:13 am
SJU
-
ISP
22h 24m
1 stop
$204Frontier
Fri, May 1 - Mon, May 4
Frontier Logo
8:31 pm - 11:29 pm
ISP
-
SJU
26h 58m
1 stop
Frontier Logo
6:30 am - 11:00 am
SJU
-
ISP
28h 30m
1 stop
$212Frontier
Thu, Apr 30 - Sun, May 3
Frontier Logo
4:07 pm - 10:56 pm
ISP
-
SJU
6h 49m
1 stop
Frontier Logo
6:30 am - 9:13 am
SJU
-
ISP
26h 43m
1 stop
$224Frontier
Fri, May 29 - Sun, May 31
Frontier Logo
11:00 am - 8:04 am
ISP
-
SJU
21h 04m
1 stop
Frontier Logo
6:09 pm - 10:05 am
SJU
-
ISP
15h 56m
1 stop
$232Frontier
Fri, Apr 10 - Wed, Apr 15
Frontier Logo
11:51 am - 11:40 pm
ISP
-
SJU
11h 49m
1 stop
Frontier Logo
10:54 am - 9:33 am
SJU
-
ISP
22h 39m
1 stop
$244Frontier
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.

Which airlines fly non-stop between Islip and Puerto Rico?

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 Puerto Rico.

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

Good to know

Cheapest flight$88
Most popular time to fly and prices are also 25% 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.

Reviews of the top airlines 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.
8.0
SouthwestOverall score based on 4325 reviews
8.0Comfort
7.0Food
8.1Boarding
7.5Entertainment
8.6Crew
Airline reviews

Southwest was greaat! The most expensive but the least upsetting for those we were flying to see.

10.0 ExcellentMartie, Mar 2026
LGB - BNA
Read more Southwest reviews

Southwest was greaat! The most expensive but the least upsetting for those we were flying to see.

I flew twice this week on Southwest, was delayed over 2 hours both ways. From Pittsburgh to Chicago it was due to weather but the gate agents, pilot etc were great at updating everyone. Today from Midway to Pittsburgh the plane had come from an international location, kept getting delayed, no information was given until we were delayed for the third time. It was ridiculous, whoever scheduled that plane to fly to Pittsburgh after didn’t consider a lot of things.

Boarding was easy. The seats are small and fairly uncomfortable

I was supposed to be on a later flight. When I showed up at the gate, the woman working there was extremely helpful getting moved up to this earlier flight.

We had a 5 hour delay on the tarmac in Baltimore

Long layover between flights to Long Island from BWI - need better coordination between flights

I elected to pay for the upgrades and found very little difference

The new seating arrangement is so over priced for what you get.

The problem with the seat assignments is that there were a lot of rows in the front that were empty but my row at the back was full. Just not so pleasant.

No food or entertainment, just a quick 40 minute flight. A little bumpy due to Santa Ana winds but pilot has no control over that. Good flight and landing!

More inflight connection. And leg space is horrible. And the paying for baggage I'd ridiculous!!!

My flight was originally from SAT to MCO connecting from MCO to ORD. We got diverted to ATL and than Frontier staff there was sooo un helpful first they said they couldn’t give us any accommodation since our flight first got delayed that cancelled and now it’s 221am and I am still in ATL since they said they need to create a new flight my final destination is ORD and I have been delayed twice and cancelled. With no real help the frontier app didn’t work no email updates over all such a horrible experience

There's no seats that lean back with little leg space i wad uncomfortable the entire flight. Your charges for extra baggage is despicable and costly!!

Remind customers of the need to have passport or new ID for boarding.

Flight was canceled. Most upsetting was message from Kayak, stating that the flight was canceled and click with Kayak for details regarding rebook, refund details. THERE'S NO INFORMATION PROVIDED BY KAYAK EXCEPT THAT FLIGHT IS CANCELED. AND NOW THIS SURVEY TO FIND OUT HOW WAS THE FLIGHT !!!!!!!

The flight never took off and we spent 7 hours at the airport

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.

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

Information on your arrival and departure airports