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Islip

$458+ Cheap flights from Washington to Islip, NY (ISP)

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 3/16. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ISP
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
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 January 29, 2026.

This Southwest deal was found by Cheapflights users on 1/28. 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 3/1611:55 pm
SEA
-
ISP
2 stops8h 45m
Southwest
Sun 3/2211:45 am
ISP
-
SEA
2 stops15h 35m
Southwest
Deal found 1/28$458
This Southwest deal was found by Cheapflights users on 1/28. 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 7/99:25 pm
SEA
-
ISP
1 stop7h 55m
Southwest
Sun 7/126:00 am
ISP
-
SEA
2 stops11h 15m
Southwest
Deal found 1/28$528
This Southwest deal was found by Cheapflights users on 1/27. 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 2/116:45 am
PDX
-
ISP
2 stops12h 10m
Southwest
Sun 2/1511:50 am
ISP
-
PDX
2 stops13h 55m
Southwest
Deal found 1/27$577
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 Southwest deal was found by Cheapflights users on 1/28. 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 2/136:25 pm
SEA
-
ISP
2 stops12h 45m
Southwest
Tue 2/1711:50 am
ISP
-
SEA
2 stops14h 25m
Southwest
Deal found 1/28$782
This Travelocity deal was found by Cheapflights users on 1/28. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/149:37 pm
PDX
-
ISP
1 stop10h 28m
Multiple Airlines
Sat 10/109:59 am
ISP
-
PDX
2 stops17h 11m
Multiple Airlines
Deal found 1/28$980
This Expedia deal was found by Cheapflights users on 1/27. 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 2/117:00 am
PDX
-
ISP
1 stop8h 44m
Multiple Airlines
Sun 2/159:59 am
ISP
-
PDX
1 stop13h 01m
Multiple Airlines
Deal found 1/27$1,219
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
This Expedia deal was found by Cheapflights users on 1/27. 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 2/115:59 am
PSC
-
ISP
2 stops9h 45m
Multiple Airlines
Sun 2/159:59 am
ISP
-
PSC
2 stops17h 00m
Multiple Airlines
Deal found 1/27$1,528

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 January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$458
(Southwest)

Popular in

December

Cheapest in

September

Average price

$362
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
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).
Search Deals
Average for round-trip flights in January 2026
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 January 29, 2026.
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

SeattleIslip

SEA - ISP

SEAISP

Seattle/Tacoma Intl

Mon 3/16

11:55 pm-11:40 am

2 stops8h 45m

Islip Long Island

Sun 3/22

11:45 am-12:20 am

2 stops15h 35m

$458

SeattleIslip

SEA - ISP

SEAISP

Seattle/Tacoma Intl

Thu 7/9

9:25 pm-8:20 am

1 stop7h 55m

Islip Long Island

Sun 7/12

6:00 am-2:15 pm

2 stops11h 15m

$528

PortlandIslip

PDX - ISP

PDXISP

Portland

Wed 2/11

6:45 am-9:55 pm

2 stops12h 10m

Islip Long Island

Sun 2/15

11:50 am-10:45 pm

2 stops13h 55m

$577

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

Fri 2/13

6:25 pm-10:10 am

2 stops12h 45m

Islip Long Island

Tue 2/17

11:50 am-11:15 pm

2 stops14h 25m

$782

PortlandIslip

PDX - ISP

PDXISP

Portland

Wed 2/11

7:00 am-6:44 pm

1 stop8h 44m

Islip Long Island

Sun 2/15

9:59 am-8:00 pm

1 stop13h 01m

$1,219

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

PascoIslip

PSC - ISP

PSCISP

Pasco Tri Cities

Wed 2/11

5:59 am-6:44 pm

2 stops9h 45m

Islip Long Island

Sun 2/15

9:59 am-11:59 pm

2 stops17h 00m

$1,528

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

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 $129). Flying from State of Washington 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 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 8h 45m. Fly via Southwest to get the fastest option. There are 2440 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 $129). Flying from State of Washington 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?

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Riverhead

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