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Islip

$134+ Cheap flights from Washington to Islip, NY (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 1/29. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ISP
Jan 14 — Jan 211
Wed 1/14
Wed 1/21
1 adult, Economy
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Cheap flight deals from Washington to Islip

Cheapest flights from Washington to Islip
Explore the most affordable flight options available from Washington to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 15, 2025.

This Southwest deal was found by Cheapflights users on 12/15. 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 12/289:00 pmPDX - ISP
2 stops14h 00mSouthwest
Sat 1/35:55 pmISP - PDX
2 stops9h 45mSouthwest
Deal found 12/15$643
This Southwest deal was found by Cheapflights users on 12/13. 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.
Mon 12/296:45 amSEA - ISP
2 stops14h 10mSouthwest
Sun 1/412:40 pmISP - SEA
2 stops15h 15mSouthwest
Deal found 12/13$670
This Expedia deal was found by Cheapflights users on 12/13. 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.
Mon 12/2911:25 pmSEA - ISP
1 stop8h 40mMultiple Airlines
Sun 1/49:59 amISP - SEA
1 stop14h 31mMultiple Airlines
Deal found 12/13$1,584
This Expedia deal was found by Cheapflights users on 12/15. 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.
Sun 12/289:42 pmPDX - ISP
1 stop10h 23mMultiple Airlines
Sat 1/39:59 amISP - PDX
1 stop13h 37mMultiple Airlines
Deal found 12/15$1,769

Find flight deals from Washington to Islip

Keep the following information in mind while searching for Washington to Islip flight deals. Data was last updated December 15, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$403
(Southwest)

One-way from

$134
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$492
Provider with most accurate pricing for Seattle/Tacoma Intl-New York (NYC) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-New York (NYC) flights.
Search Deals
From Washington to Islip Long Island
Search Deals
One-way flight from Washington to Islip Long Island
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($25 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington 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 December 15, 2025.
Use the filters below to find and compare flights from Washington to Islip that are best for you.

Fly from

Washington

Fly to

Islip

Route

Depart

Return

Price

PortlandIslip

PDX - ISP

PDXISP

Portland

Tue 1/13

6:45 am-9:55 pm

2 stops12h 10m

Islip Long Island

Tue 1/20

12:40 pm-10:15 pm

2 stops12h 35m

$403

SeattleIslip

SEA - ISP

SEAISP

Seattle/Tacoma Intl

Thu 1/29

9:55 am-9:55 pm

2 stops9h 00m

Islip Long Island

Wed 2/4

6:00 am-5:50 pm

2 stops14h 50m

$403

PortlandIslip

PDX - ISP

PDXISP

Portland

Sun 12/28

9:00 pm-2:00 pm

2 stops14h 00m

Islip Long Island

Sat 1/3

5:55 pm-12:40 am

2 stops9h 45m

$643

SeattleIslip

SEA - ISP

SEAISP

Seattle/Tacoma Intl

Mon 12/29

6:45 am-11:55 pm

2 stops14h 10m

Islip Long Island

Sun 1/4

12:40 pm-12:55 am

2 stops15h 15m

$670

SeattleIslip

SEA - ISP

SEAISP

Seattle/Tacoma Intl

Thu 1/29

7:55 am-7:45 pm

1 stop8h 50m

Islip Long Island

Wed 2/4

9:59 am-10:17 pm

1 stop15h 18m

$904

PortlandIslip

PDX - ISP

PDXISP

Portland

Tue 1/13

7:00 am-7:45 pm

1 stop9h 45m

Islip Long Island

Tue 1/20

9:59 am-8:48 pm

1 stop13h 49m

$1,004

SeattleIslip

SEA - ISP

SEAISP

Seattle/Tacoma Intl

Mon 12/29

11:25 pm-11:05 am

1 stop8h 40m

Islip Long Island

Sun 1/4

9:59 am-9:30 pm

1 stop14h 31m

$1,584

PortlandIslip

PDX - ISP

PDXISP

Portland

Sun 12/28

9:42 pm-11:05 am

1 stop10h 23m

Islip Long Island

Sat 1/3

9:59 am-8:36 pm

1 stop13h 37m

$1,769

SeattleIslip

SEA - ISP

SEAISP

Seattle/Tacoma Intl

Thu 1/29

12:34 pm-8:47 pm

2 stops29h 13m

$134

SeattleIslip

SEA - ISP

SEAISP

Seattle/Tacoma Intl

Mon 12/29

7:48 pm-11:25 am

2 stops12h 37m

$293

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/13

Showing 1-10 of 11 results
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Best time to book a flight from Washington to Islip

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

What is the cheapest month to book a flight from State of Washington to Islip, New York?

Currently, December is the cheapest month in which you can book a flight from State of Washington to Islip, New York (average of $132). Flying from State of Washington to Islip, New York in February is currently the most expensive (average of $199). 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 Washington to Islip. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Islip from Washington?

    If you book a flight to Islip from Washington, you will be flying to Long Island, which is the city’s only airport. Islip Long Island (ISP) is located 7.2 mi from the center of Islip.

  • How long is the flight from State of Washington to Islip, New York?

    There are many flights that can get you from State of Washington to Islip, New York in 12h 10m. Fly via Southwest to get the fastest option. There are 2474 mi between State of Washington and Islip, New York.

  • What are the most popular routes from State of Washington to Islip, New York?

    Most travelers choose Seattle/Tacoma Intl - Islip Long Island, Portland - Islip Long Island or Pasco Tri Cities - Islip Long Island when deciding on the best route from State of Washington to Islip, New York.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Washington 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 State of Washington to Islip, New York?

    Currently, December is the cheapest month in which you can book a flight from State of Washington to Islip, New York (average of $132). Flying from State of Washington to Islip, New York in February is currently the most expensive (average of $199). 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?

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