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$231+ 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 11/12. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SEA
Nov 27 — Dec 41
Thu 11/27
Thu 12/4
1 adult, Economy
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Find 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 October 28, 2025.

This Southwest deal was found by Cheapflights users on 10/27. 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.
Mon 11/243:25 pmISP - SEA
2 stops12h 10mSouthwest
Mon 12/15:00 amSEA - ISP
2 stops15h 10mSouthwest
Deal found 10/27$529
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1112:40 pmISP - SEA
1 stop24h 55mMultiple Airlines
Sat 11/159:00 amSEA - ISP
1 stop7h 45mMultiple Airlines
Deal found 10/27$1,015
This Southwest deal was found by Cheapflights users on 10/26. 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.
Thu 10/305:30 amISP - PDX
2 stops14h 05mSouthwest
Sat 11/15:05 amPDX - ISP
2 stops10h 50mSouthwest
Deal found 10/26$1,067
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/249:02 amISP - SEA
2 stops37h 15mMultiple Airlines
Mon 12/111:12 pmSEA - ISP
1 stop8h 52mMultiple Airlines
Deal found 10/27$1,228
This Expedia deal was found by Cheapflights users on 10/27. 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.
Tue 11/119:59 amISP - PDX
1 stop13h 08mMultiple Airlines
Sat 11/157:00 amPDX - ISP
1 stop9h 45mMultiple Airlines
Deal found 10/27$1,319
This United deal was found by Cheapflights users on 10/26. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/309:59 amISP - PDX
2 stops17h 27mMultiple Airlines
Sat 11/16:00 amPDX - ISP
3 stops35h 45mMultiple Airlines
Deal found 10/26$1,496

Cheap flight deals from Islip to Washington

Keep the following information in mind while searching for Islip to Washington flight deals. Data was last updated October 28, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$529
(Southwest)

One-way from

$231
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$319
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
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Highest demand for flights based on searches. 7% potential increase in price ($32 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($15 potential savings vs. average RT price).
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Average for round-trip flights in October 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 October 28, 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

Mon 11/24

3:25 pm-12:35 am

2 stops12h 10m

Seattle/Tacoma Intl

Mon 12/1

5:00 am-11:10 pm

2 stops15h 10m

$529

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Tue 2/24

7:30 am-1:23 pm

1 stop8h 53m

Seattle/Tacoma Intl

Fri 2/27

8:20 am-7:45 pm

1 stop8h 25m

$895

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Wed 2/25

7:30 am-1:23 pm

1 stop8h 53m

Seattle/Tacoma Intl

Fri 2/27

8:20 am-7:45 pm

1 stop8h 25m

$895

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Tue 2/17

7:30 am-1:23 pm

1 stop8h 53m

Seattle/Tacoma Intl

Thu 3/5

8:20 am-7:45 pm

1 stop8h 25m

$920

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Sun 3/8

7:30 am-1:23 pm

1 stop8h 53m

Seattle/Tacoma Intl

Thu 3/12

8:20 am-7:45 pm

1 stop8h 25m

$994

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Thu 2/12

7:30 am-1:23 pm

1 stop8h 53m

Seattle/Tacoma Intl

Sun 2/15

8:20 am-7:45 pm

1 stop8h 25m

$1,024

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Tue 2/17

7:30 am-1:23 pm

1 stop8h 53m

Seattle/Tacoma Intl

Sat 2/21

8:20 am-7:45 pm

1 stop8h 25m

$1,048

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Tue 11/11

10:38 am-7:05 pm

2 stops35h 27m

Seattle/Tacoma Intl

Sat 11/15

9:00 am-7:45 pm

1 stop7h 45m

$1,081

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Thu 2/19

7:30 am-1:23 pm

1 stop8h 53m

Seattle/Tacoma Intl

Sun 2/22

8:20 am-7:45 pm

1 stop8h 25m

$1,088

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Mon 2/16

7:30 am-1:23 pm

1 stop8h 53m

Seattle/Tacoma Intl

Fri 2/20

8:20 am-7:45 pm

1 stop8h 25m

$1,098

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/26

Showing 1-10 of 17 results
1
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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 $140). 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 October 28, 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
8.0
Very good
4,240 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,240 reviews
Southwest
8.0
Very good
4,240 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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 12h 10m. Southwest provides one of the quickest options available for as low as $529. 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 $140). 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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Alternative routes for Islip to Washington

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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 October 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$356Average$564FlexibilityNo cancel feeOn-time63%

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