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Islip

$249+ Cheap flights from Seattle to Islip, NY (SEA - ISP)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/27. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ISP
Feb 27 — Mar 61
Fri 2/27
Fri 3/6
1 adult, Economy
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Cheap flight deals from Seattle to Islip

Cheapest flights from Seattle to Islip
Explore the most affordable flight options available from Seattle to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 28, 2026.

This Southwest deal was found by Cheapflights users on 1/26. 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 2/116:25 am
SEA
-
ISP
2 stops12h 30m
Southwest
Sun 2/1511:50 am
ISP
-
SEA
2 stops14h 25m
Southwest
Deal found 1/26$604
This Expedia deal was found by Cheapflights users on 1/26. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/117:55 am
SEA
-
ISP
1 stop7h 49m
Multiple Airlines
Sun 2/159:59 am
ISP
-
SEA
1 stop15h 01m
Multiple Airlines
Deal found 1/26$1,240

Find flight deals from Seattle to Islip

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Islip (ISP). 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 January 28, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$604
(Southwest)

One-way from

$249
(Southwest)

Popular in

December

Cheapest in

September

Average price

$362
Provider with most accurate pricing for Seattle/Tacoma Intl-Islip Long Island flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Islip Long Island flights.
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From Seattle/Tacoma Intl to Islip Long Island
Search Deals
One-way flight from Seattle/Tacoma Intl to Islip Long Island
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($28 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Islip 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 January 28, 2026.
Use the filters below to find and compare flights from Seattle to Islip that are best for you.

Fly from

Seattle

Fly to

Islip

Route

Depart

Return

Price

SeattleIslip

SEA - ISP

SEAISP

Seattle/Tacoma Intl

Wed 2/11

6:25 am-9:55 pm

2 stops12h 30m

Islip Long Island

Sun 2/15

11:50 am-11:15 pm

2 stops14h 25m

$604

SeattleIslip

SEA - ISP

SEAISP

Seattle/Tacoma Intl

Wed 2/11

7:55 am-6:44 pm

1 stop7h 49m

Islip Long Island

Sun 2/15

9:59 am-10:00 pm

1 stop15h 01m

$1,240

SeattleIslip

SEA - ISP

SEAISP

Seattle/Tacoma Intl

Mon 7/27

10:45 pm-11:50 am

2 stops10h 05m

$249

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/26

  • Most accurate provider: When it comes to deals on Seattle-Islip, New York flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Islip, New York flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Islip, New York flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Islip, New York 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 Seattle-Islip, New York 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 Seattle to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from Seattle 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.

Cheapflights Insights

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

What is the cheapest month to book a flight from Seattle to Islip, New York?

Currently, December is the cheapest month in which you can book a flight from Seattle to Islip, New York (average of $129). Flying from Seattle to Islip, New York in February is currently the most expensive (average of $198). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Islip. 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 Seattle to Islip, New York?

    Airlines like Southwest fly from Seattle to Islip, New York in about 12h 30m. The time it takes to get you to your destination can typically vary by up to . Seattle and Islip, New York are separated by a distance of 2440 mi.

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

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

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

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

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

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

  • What is the cheapest month to book a flight from Seattle to Islip, New York?

    Currently, December is the cheapest month in which you can book a flight from Seattle to Islip, New York (average of $129). Flying from Seattle to Islip, New York in February is currently the most expensive (average of $198). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Islip?

Book flights to Islip if you plan to visit one of these locations
Riverhead

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