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$197+ 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 1/24. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SEA
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
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 December 12, 2025.

This Southwest deal was found by Cheapflights users on 12/11. 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 12/291:35 pmISP - PDX
2 stops13h 55mSouthwest
Wed 12/316:40 amPDX - ISP
2 stops12h 25mSouthwest
Deal found 12/11$637
This Southwest deal was found by Cheapflights users on 12/11. 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 12/3012:40 pmISP - SEA
2 stops15h 15mSouthwest
Sat 1/38:50 amSEA - ISP
2 stops12h 05mSouthwest
Deal found 12/11$913
This Mytrip deal was found by Cheapflights users on 12/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/267:25 amISP - SEA
2 stops12h 59mMultiple Airlines
Tue 12/306:34 pmSEA - ISP
2 stops18h 36mMultiple Airlines
Deal found 12/11$1,825
This Expedia deal was found by Cheapflights users on 12/10. 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.
Fri 12/2612:30 pmISP - PDX
2 stops14h 35mMultiple Airlines
Tue 12/309:50 pmPDX - ISP
2 stops18h 55mMultiple Airlines
Deal found 12/10$2,051
This Expedia deal was found by Cheapflights users on 12/11. 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 12/2912:30 pmISP - PDX
1 stop11h 06mMultiple Airlines
Wed 12/319:42 pmPDX - ISP
1 stop10h 23mMultiple Airlines
Deal found 12/11$2,065
This Expedia deal was found by Cheapflights users on 12/11. 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.
Tue 12/309:59 amISP - SEA
2 stops26h 18mMultiple Airlines
Sat 1/311:25 pmSEA - ISP
1 stop8h 40mMultiple Airlines
Deal found 12/11$2,137

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 December 12, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$430
(Southwest)

One-way from

$197
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$537
Provider with most accurate pricing for New York (NYC)-Seattle/Tacoma Intl flight deals.
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Provider most trusted by Cheapflights users for New York (NYC)-Seattle/Tacoma Intl flights.
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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. 4% potential increase in price ($19 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in December 2025
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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 December 12, 2025.
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

Thu 1/8

12:40 pm-11:05 pm

2 stops13h 25m

Seattle/Tacoma Intl

Sun 1/11

6:05 am-10:20 pm

2 stops13h 15m

$430

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Wed 4/22

9:00 am-6:25 pm

2 stops12h 25m

Seattle/Tacoma Intl

Tue 4/28

6:00 am-6:30 pm

2 stops9h 30m

$457

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Mon 12/29

1:35 pm-12:30 am

2 stops13h 55m

Portland

Wed 12/31

6:40 am-10:05 pm

2 stops12h 25m

$637

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Tue 12/30

12:40 pm-12:55 am

2 stops15h 15m

Seattle/Tacoma Intl

Sat 1/3

8:50 am-11:55 pm

2 stops12h 05m

$913

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Thu 1/8

9:59 am-10:17 pm

1 stop15h 18m

Seattle/Tacoma Intl

Sun 1/11

7:55 am-7:45 pm

1 stop8h 50m

$1,030

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Wed 4/22

7:25 am-1:26 pm

1 stop9h 01m

Seattle/Tacoma Intl

Tue 4/28

10:50 pm-4:10 pm

1 stop14h 20m

$1,030

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Fri 12/26

7:25 am-5:24 pm

2 stops12h 59m

Seattle/Tacoma Intl

Tue 12/30

6:34 pm-4:10 pm

2 stops18h 36m

$1,825

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Fri 12/26

12:30 pm-12:05 am

2 stops14h 35m

Portland

Tue 12/30

9:50 pm-7:45 pm

2 stops18h 55m

$2,051

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Mon 12/29

12:30 pm-8:36 pm

1 stop11h 06m

Portland

Wed 12/31

9:42 pm-11:05 am

1 stop10h 23m

$2,065

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Tue 12/30

9:59 am-9:17 am

2 stops26h 18m

Seattle/Tacoma Intl

Sat 1/3

11:25 pm-11:05 am

1 stop8h 40m

$2,137

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/9

Showing 1-10 of 12 results
1
2

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 March is currently the most expensive (average of $237). 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.

Reviews of airlines servicing Washington

Get insights into the airlines that provide service to Washington. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Washington. Reviews last updated December 12, 2025.
Read through reviews of airlines operating flights from Islip to Washington, such as Southwest. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
7.9
Good
4,253 reviews

Food

7.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Overall

7.9

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
7.9
Good
4,253 reviews
Southwest
7.9
Good
4,253 reviews

Food

7.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Overall

7.9

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

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 13h 25m. Southwest provides one of the quickest options available for as low as $430. 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 March is currently the most expensive (average of $237). 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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Top airline flying from Islip to Washington

Discover the top airline that operate flights from Islip to Washington. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$356Average$564FlexibilityNo cancel feeOn-time63%

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