ISP - SEA

$368 Find Cheap Flights from Islip to Seattle

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Islip to Seattle departing on 8/29. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Seattle

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Islip to Seattle, 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 Seattle, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 22% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flights Deals
Useful Info
Flights Deals

Cheap Flights from Islip to Seattle (ISP-SEA)

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

Fri, Aug 29 - Sat, Sep 6
Southwest Logo
3:05 pm - 9:30 pmISP-SEA
9h 25m1 stop
Southwest Logo
8:10 am - 9:40 pmSEA-ISP
10h 30m2 stops
$368Southwest
Find Deal
Fri, Oct 31 - Sat, Nov 8
Southwest Logo
11:25 am - 9:30 pmISP-SEA
13h 05m2 stops
Southwest Logo
5:45 am - 8:40 pmSEA-ISP
11h 55m2 stops
$373Southwest
Find Deal
Fri, Aug 29 - Sat, Sep 6
Southwest Logo
3:05 pm - 9:30 pmISP-SEA
9h 25m1 stop
Southwest Logo
9:10 pm - 12:30 pmSEA-ISP
12h 20m1 stop
$398Southwest
Find Deal
Fri, Aug 29 - Sat, Sep 6
Southwest Logo
3:05 pm - 12:05 amISP-SEA
12h 00m2 stops
Southwest Logo
7:35 am - 9:40 pmSEA-ISP
11h 05m2 stops
$400Southwest
Find Deal
Fri, Oct 24 - Fri, Oct 31
Southwest Logo
5:30 am - 3:00 pmISP-SEA
12h 30m2 stops
Southwest Logo
6:05 am - 9:10 pmSEA-ISP
12h 05m2 stops
$403Southwest
Find Deal
Sun, Aug 24 - Wed, Aug 27
Southwest Logo
6:00 am - 12:15 pmISP-SEA
9h 15m1 stop
Southwest Logo
6:15 am - 10:05 pmSEA-ISP
12h 50m2 stops
$451Southwest
Find Deal
Sun, Aug 24 - Wed, Aug 27
Southwest Logo
6:00 am - 3:00 pmISP-SEA
12h 00m2 stops
Southwest Logo
6:45 am - 10:05 pmSEA-ISP
12h 20m2 stops
$456Southwest
Find Deal
Fri, Aug 29 - Sun, Aug 31
Southwest Logo
3:05 pm - 9:30 pmISP-SEA
9h 25m1 stop
Southwest Logo
11:05 pm - 12:00 pmSEA-ISP
9h 55m2 stops
$468Southwest
Find Deal
Tue, Aug 12 - Tue, Aug 19
 Logo
8:00 am - 11:02 pmISP-SEA
18h 02m2 stops
 Logo
11:05 pm - 11:41 pmSEA-ISP
21h 36m1 stop
Tue, Aug 12 - Tue, Aug 19
 Logo
8:00 am - 7:50 pmISP-SEA
14h 50m1 stop
 Logo
3:53 pm - 11:41 pmSEA-ISP
28h 48m1 stop
Useful Info

Good to know

Cheapest flight$368
Flight from Islip to Seattle

When to book flights from Islip to Seattle

Are your dates flexible? Find out the best times to travel from Islip to Seattle 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 flights from Islip to Seattle

  • What is the cheapest flight from Islip to Seattle?

    In the last 3 days, the lowest price for a flight from Islip to Seattle was $643 for a one-way ticket and $368 for a round-trip.

  • Do I need a passport to fly between Islip and Seattle?

    A passport is not required to fly from Islip to Seattle.

  • Which airports will I be using when flying from Islip to Seattle?

    Islip airport is called Islip Long Island and the only airport in Seattle is Seattle/Tacoma Intl.

  • Which aircraft models fly most regularly from Islip to Seattle?

    We unfortunately don’t have that data for this specific route.

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

    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 Seattle.

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

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

    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 Seattle with an airline and back to Islip with another airline. Booking your flights between Islip and SEA 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 Seattle?

    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 Seattle 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 airline flying from Islip to Seattle

 
See real verified KAYAK customer reviews for airlines flying from Islip to Seattle. 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 Seattle? 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 4241 reviews
8.0Comfort
8.1Boarding
7.0Food
8.6Crew
7.5Entertainment
Airline reviews

southwest just starting charging for luggage. hadnt realized it until it was too late. now out $70 when i couldve bought a carry on if i wouldve known. free bags was one of the only reasons i chose southwest over another airline (the other being no assigned seats, which is apparently also being changed). stupid business decision. wont be flying southwest anymore.

2.0 MediocreAnonymous, Jul 2025AUS - RDU
Read more Southwest reviews

southwest just starting charging for luggage. hadnt realized it until it was too late. now out $70 when i couldve bought a carry on if i wouldve known. free bags was one of the only reasons i chose southwest over another airline (the other being no assigned seats, which is apparently also being changed). stupid business decision. wont be flying southwest anymore.

The quality of Southwest Airlines continues to degrade each time I fly with them. If it were not for the free luggage, I would probably choose another airline. Their prices are a little bit competitive, but way too high for the quality of the service. Southwest is not unique in this way. Domestic flight in the United States of America has continued to be a lower and lower quality product. Very sad when you compare the quality of domestic airlines to that of many international airlines around the world.

Very smooth checking in our luggage with a super pleasant SW agent. I enjoyed a fun entertaining movie.

WiFi did not work. For as outrageous as these flights cost, when they’re advertised with certain services/ features they should be in working order

Worst experience I had on Southwest. Still better than most, but the seating was barely tolerable.

The Southwest employees (all two of them) were very nice and cheerful despite the fact the line to self-check a bag (simply drop it off) was hundreds of people long. Thank God I arrived early to the airport because I stood in this line for at least an hour. Once on the flight that had been delayed by an hour, we had no Wi-Fi and thus no entertainment. Finally, I hope the investor strong arm tactics against Southwest pay off in a short-term windfall to your C-Suite because the rest of you are screwed. I have been a faithful Southwest customer for 15 years due to everything you just got rid of. I'm flying to Idaho and Washington in October, both places I used to simply book with Southwest without a second thought now with Frontier (Washington) and United (Idaho) because they offer everything the "new" Southwest does but cheaper and at better times, destinations, etc. This really makes me sad...

It was okay. The plane was delayed from earlier in the day, but they kept updating the departure time, sometimes later, sometimes earlier. That was stressful. Once we finally got on and took off, it was fine. I was supposed to have a connection in Chicago to Los Angeles, and the time for so late I was rebooked to arrive in LA 3 hours late. The departure time to Chicago later became early enough to have taken my original connection and arrive earlier but that wasn't an option.

It was one and half hour late... Not sure if any other experience matters.

Delayed flight. Nicest crew member was a SW pilot flying seated next to me who kindly move to seat the final passenger. Flight extra delayed. My cup of refreshment of ginger ale was so packed with ice it was literally 2 sips.

For my birthday trip this was my second time ever flying, this trip was the best.

Everything you need to know for your flight from Islip to Seattle

Information on your arrival and departure airports

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.