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$194+ Cheap flights from Islip, NY (ISP) to Washington

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 2/23. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SEA
Mar 5 — Mar 121
Thu 3/5
Thu 3/12
1 adult, Economy
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Cheap flight deals from Islip to Washington

Cheapest flights from Islip to Washington
Explore the most affordable flight options available from Islip to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 3, 2026.

This Southwest deal was found by Cheapflights users on 2/1. 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 8/146:10 am
ISP
-
SEA
2 stops10h 45m
Southwest
Sat 8/2210:30 pm
SEA
-
ISP
1 stop8h 25m
Southwest
Deal found 2/1$462
This Southwest deal was found by Cheapflights users on 2/3. 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 2/1812:40 pm
ISP
-
SEA
2 stops12h 55m
Southwest
Sun 2/227:25 am
SEA
-
ISP
2 stops13h 05m
Southwest
Deal found 2/3$637
This Southwest deal was found by Cheapflights users on 2/1. 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.
Tue 2/1711:50 am
ISP
-
SEA
2 stops14h 25m
Southwest
Sat 2/216:50 am
SEA
-
ISP
2 stops12h 10m
Southwest
Deal found 2/1$872
This Southwest deal was found by Cheapflights users on 2/2. 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.
Tue 2/1711:50 am
ISP
-
PDX
2 stops11h 25m
Southwest
Sat 2/217:15 am
PDX
-
ISP
2 stops11h 45m
Southwest
Deal found 2/2$872
This Southwest deal was found by Cheapflights users on 1/31. 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 2/46:00 am
ISP
-
SEA
2 stops14h 50m
Southwest
Fri 2/66:05 am
SEA
-
ISP
2 stops13h 15m
Southwest
Deal found 1/31$1,087
This Expedia deal was found by Cheapflights users on 2/3. 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 2/189:59 am
ISP
-
SEA
1 stop15h 01m
Multiple Airlines
Sun 2/2210:48 pm
SEA
-
ISP
2 stops16h 56m
Multiple Airlines
Deal found 2/3$1,263
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/179:59 am
ISP
-
SEA
1 stop15h 01m
Multiple Airlines
Sat 2/2110:40 pm
SEA
-
ISP
1 stop17h 04m
Multiple Airlines
Deal found 2/1$1,419
This Kiwi.com deal was found by Cheapflights users on 1/31. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/49:59 am
ISP
-
SEA
1 stop15h 18m
Multiple Airlines
Fri 2/63:40 pm
SEA
-
ISP
1 stop24h 04m
Multiple Airlines
Deal found 1/31$1,500

Find flight deals from Islip to Washington

Keep the following information in mind while searching for Islip to Washington flight deals. Data was last updated February 3, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$637
(Southwest)

One-way from

$194
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$357
Provider with most accurate pricing for New York (NYC)-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for New York (NYC)-Seattle/Tacoma Intl flights.
Search Deals
From Islip Long Island to Washington
Search Deals
One-way flight from Islip Long Island to Washington
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($14 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to Washington 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 February 3, 2026.
Use the filters below to find and compare flights from Islip to Washington that are best for you.

Fly from

Islip

Fly to

Washington

Route

Depart

Return

Price

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Wed 2/18

12:40 pm-10:35 pm

2 stops12h 55m

Seattle/Tacoma Intl

Sun 2/22

7:25 am-11:30 pm

2 stops13h 05m

$637

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Tue 2/17

11:50 am-11:15 pm

2 stops14h 25m

Seattle/Tacoma Intl

Sat 2/21

6:50 am-10:00 pm

2 stops12h 10m

$872

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Tue 2/17

11:50 am-8:15 pm

2 stops11h 25m

Portland

Sat 2/21

7:15 am-10:00 pm

2 stops11h 45m

$872

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Wed 2/18

9:59 am-10:00 pm

1 stop15h 01m

Seattle/Tacoma Intl

Sun 2/22

10:48 pm-6:44 pm

2 stops16h 56m

$1,263

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Tue 2/17

9:59 am-10:00 pm

1 stop15h 01m

Seattle/Tacoma Intl

Sat 2/21

10:40 pm-6:44 pm

1 stop17h 04m

$1,419

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Mon 2/23

8:23 am-10:54 am

3 stops29h 31m

$194

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Mon 2/23

5:55 am-6:30 pm

2 stops15h 35m

$271

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/31

Best time to book a flight from Islip to Washington

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

Cheapflights Insights

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

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

Currently, October is the cheapest month in which you can book a flight from Islip, New York to State of Washington (average of $148). Flying from Islip, New York to State of Washington in July is currently the most expensive (average of $224). 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 Islip to Washington. 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 from for flights from Islip to Washington?

    Most people fly from Islip Long Island (ISP) if they book a flight from Islip to Washington. Islip Long Island is conveniently located just 7.2 mi from Islip’s city center.

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

    A quick flight from Islip, New York to State of Washington can take about 14h 25m. Southwest provides one of the quickest options available for as low as $872. Airlines will cover a distance of 2440 mi.

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

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

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

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

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

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

    Currently, October is the cheapest month in which you can book a flight from Islip, New York to State of Washington (average of $148). Flying from Islip, New York to State of Washington in July is currently the most expensive (average of $224). 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

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