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$472+ Cheap flights from Islip, NY to Seattle (ISP - SEA)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/3. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SEA
Jun 9 — Jun 161
Tue 6/9
Tue 6/16
1 adult, Economy
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Cheap flight deals from Islip to Seattle

Cheapest flights from Islip to Seattle
Explore the most affordable flight options available from Islip to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 10, 2026.

This Southwest deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/36:55 am
ISP
-
SEA
2 stops13h 00m
Southwest
Wed 6/109:25 pm
SEA
-
ISP
1 stop7h 55m
Southwest
Deal found 5/6$472
This Southwest deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/512:30 pm
ISP
-
SEA
1 stop9h 00m
Southwest
Mon 6/87:20 pm
SEA
-
ISP
2 stops9h 45m
Southwest
Deal found 5/6$474
This Southwest deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/1612:30 pm
ISP
-
SEA
2 stops12h 20m
Southwest
Wed 7/229:25 pm
SEA
-
ISP
1 stop7h 55m
Southwest
Deal found 5/8$494
This Southwest deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/512:30 pm
ISP
-
SEA
1 stop9h 00m
Southwest
Fri 6/1210:45 pm
SEA
-
ISP
2 stops9h 50m
Southwest
Deal found 5/8$508
This Southwest deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/303:05 pm
ISP
-
SEA
2 stops12h 25m
Southwest
Sun 8/210:45 pm
SEA
-
ISP
2 stops10h 05m
Southwest
Deal found 5/8$528
This Southwest deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/76:00 am
ISP
-
SEA
2 stops11h 15m
Southwest
Sat 6/139:25 pm
SEA
-
ISP
1 stop11h 20m
Southwest
Deal found 5/8$539

Find flight deals from Islip to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated May 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$472
(Southwest)

Popular in

December

Cheapest in

October

Average price

$407
Provider with most accurate pricing for Islip Long Island-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Islip Long Island-Seattle/Tacoma Intl flights.
Search Deals
From Islip Long Island to Seattle/Tacoma Intl
Search Deals
High demand for flights, 0% potential price rise
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 10, 2026.
Use the filters below to find and compare flights from Islip to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Wed 6/3

6:55 am-4:55 pm

2 stops13h 00m

Seattle/Tacoma Intl

Wed 6/10

9:25 pm-8:20 am

1 stop7h 55m

$472
Quickest round-trip

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Fri 6/5

12:30 pm-6:30 pm

1 stop9h 00m

Seattle/Tacoma Intl

Fri 6/12

10:45 pm-11:35 am

2 stops9h 50m

$508

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Thu 7/30

3:05 pm-12:30 am

2 stops12h 25m

Seattle/Tacoma Intl

Sun 8/2

9:25 pm-8:20 am

1 stop7h 55m

$532

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Sun 6/7

6:00 am-2:15 pm

2 stops11h 15m

Seattle/Tacoma Intl

Sat 6/13

9:25 pm-11:45 am

1 stop11h 20m

$539

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Fri 7/10

12:30 pm-12:30 am

2 stops15h 00m

Seattle/Tacoma Intl

Sat 7/25

6:30 am-11:10 pm

2 stops13h 40m

$577

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/6

Sorted by cheapest first

Compare providers for flights from Islip to Seattle

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Islip to Seattle in May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Islip, New York-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Islip, New York-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Islip, New York-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Islip, New York-Seattle flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Islip, New York-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Islip to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Islip with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Related info for your journey

Find useful and relevant information for your journey from Islip to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Islip, New York to Seattle?

    Airlines like Southwest fly from Islip, New York to Seattle in about 13h. The time it takes to get you to your destination can typically vary by up to . Islip, New York and Seattle are separated by a distance of 2440 mi.

  • Can I find deals for flights from Islip to Seattle that include hotel bookings?

    Yes. In addition to deals on Islip to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Islip to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to Seattle.

  • Can I find deals for business class flights from Islip to Seattle?

    Yes. Cheapflights offers flight deals from Islip to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
SeaTac
Tacoma
Ocean Shores
Olympia
Lacey
Edmonds
Leavenworth
Snoqualmie
Tumwater
Tukwila
Puyallup
Kent
Lynnwood
Renton
Ellensburg
Fife
Lakewood
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Issaquah
Shoreline

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