What is the cheapest airline that flies from Islip Long Island to Washington?

Frontier and Southwest are the most popular carriers operating from Islip Long Island to Washington

What airlines fly to State of Washington?

Alaska Airlines, United Airlines and Delta are the top three most popular airlines that fly to State of Washington from Islip, New York according to our data. Alaska Airlines is the first choice among our users, with 48% of people opting to fly with this airline when traveling to State of Washington. Keep in mind that there are 10 different airlines that fly to State of Washington on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Islip Long Island Airport to Washington?

Prices for flights from Islip Long Island Airport to Washington were last updated today.

How old do you have to be to fly from Islip Long Island Airport to Washington?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Islip Long Island Airport to Washington.

What documentation or ID do you need to fly to Washington?

The travel and health documents required for your trip to Washington can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Washington. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$231 Cheap Flights from Islip to Washington in 2026

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Find the cheapest flights from Islip, New York to Washington

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

5:30 am - 10:45 am

ISP

SEA

8h 15m

1 stop

10:30 pm - 10:15 am

SEA

ISP

8h 45m

1 stop

$467Southwest

Sat, Aug 22 - Mon, Aug 31

5:30 am - 10:45 am

ISP

SEA

8h 15m

1 stop

11:05 pm - 12:10 pm

SEA

ISP

10h 05m

2 stops

$472Southwest

Sat, Aug 22 - Mon, Aug 31

11:55 am - 10:55 pm

ISP

SEA

14h 00m

2 stops

11:05 pm - 12:10 pm

SEA

ISP

10h 05m

2 stops

$477Southwest

Sat, Aug 22 - Mon, Aug 31

6:20 am - 3:00 pm

ISP

SEA

11h 40m

2 stops

5:20 pm - 9:55 am

SEA

ISP

13h 35m

2 stops

$487Southwest

Sun, Aug 16 - Sat, Aug 22

12:30 pm - 9:00 pm

ISP

PDX

11h 30m

2 stops

8:50 am - 10:10 pm

PDX

ISP

10h 20m

2 stops

$503Southwest

Tue, Apr 14 - Tue, Apr 21

6:20 am - 2:40 pm

ISP

SEA

11h 20m

1 stop

5:20 pm - 9:55 am

SEA

ISP

13h 35m

2 stops

$514Southwest

Sun, Aug 16 - Sat, Aug 22

10:20 am - 3:00 pm

ISP

SEA

7h 40m

1 stop

10:30 pm - 9:40 am

SEA

ISP

8h 10m

1 stop

$518Southwest

Thu, Sep 10 - Sun, Sep 13

12:30 pm - 9:50 pm

ISP

SEA

12h 20m

2 stops

10:45 pm - 11:50 am

SEA

ISP

10h 05m

2 stops

$528Southwest

Fri, Jul 31 - Sun, Aug 2

9:59 am - 7:48 pm

ISP

PDX

12h 49m

1 stop

7:00 am - 6:44 pm

PDX

ISP

8h 44m

1 stop

$1,124Multiple Airlines

Tue, Apr 14 - Tue, Apr 21

9:59 am - 8:25 pm

ISP

PDX

13h 26m

1 stop

1:52 pm - 11:05 am

PDX

ISP

18h 13m

2 stops

$1,293Multiple Airlines

Sun, Apr 26 - Sun, May 3

Southwest flights from Islip, New York to State of Washington

Our best Southwest deals on Islip, New York to State of Washington flight tickets

Southwest

Jun 12

ISP12:30 pmIslip Long Island

9h 00m

1 stop

SEA6:30 pmSeattle/Tacoma Intl

Jun 16

SEA6:55 pmSeattle/Tacoma Intl

10h 10m

2 stops

ISP8:05 amIslip Long Island

$466

Southwest

Aug 22

ISP5:30 amIslip Long Island

8h 15m

1 stop

SEA10:45 amSeattle/Tacoma Intl

Aug 31

SEA10:30 pmSeattle/Tacoma Intl

8h 45m

1 stop

ISP10:15 amIslip Long Island

$467

Southwest

Jun 12

ISP12:30 pmIslip Long Island

12h 20m

2 stops

SEA9:50 pmSeattle/Tacoma Intl

Jun 16

SEA6:55 pmSeattle/Tacoma Intl

10h 10m

2 stops

ISP8:05 amIslip Long Island

$471

momondo Fare Finder

Use the filters below to find and compare flights from Islip, New York to Washington that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Sat 8/22

5:30 am-10:45 am

1 stop8h 15m

Seattle/Tacoma Intl

Mon 8/31

10:30 pm-10:15 am

1 stop8h 45m

$467

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Sat 8/22

5:30 am-10:45 am

1 stop8h 15m

Seattle/Tacoma Intl

Mon 8/31

11:05 pm-12:10 pm

2 stops10h 05m

$472

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Sat 8/22

11:55 am-10:55 pm

2 stops14h 00m

Seattle/Tacoma Intl

Mon 8/31

11:05 pm-12:10 pm

2 stops10h 05m

$477

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Sun 8/16

6:20 am-3:00 pm

2 stops11h 40m

Seattle/Tacoma Intl

Sat 8/22

5:20 pm-9:55 am

2 stops13h 35m

$487

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Tue 4/14

12:30 pm-9:00 pm

2 stops11h 30m

Portland

Tue 4/21

8:50 am-10:10 pm

2 stops10h 20m

$503

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Sun 8/16

6:20 am-2:40 pm

1 stop11h 20m

Seattle/Tacoma Intl

Sat 8/22

5:20 pm-9:55 am

2 stops13h 35m

$514

Quickest round-trip

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Thu 9/10

10:20 am-3:00 pm

1 stop7h 40m

Seattle/Tacoma Intl

Sun 9/13

10:30 pm-9:40 am

1 stop8h 10m

$518

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Fri 7/31

12:30 pm-9:50 pm

2 stops12h 20m

Seattle/Tacoma Intl

Sun 8/2

10:45 pm-11:50 am

2 stops10h 05m

$528

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Tue 4/14

9:59 am-7:48 pm

1 stop12h 49m

Portland

Tue 4/21

7:00 am-6:44 pm

1 stop8h 44m

$1,124

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Sun 4/26

9:59 am-8:25 pm

1 stop13h 26m

Portland

Sun 5/3

1:52 pm-11:05 am

2 stops18h 13m

$1,293

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Islip, New York to State of Washington

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Can stopping save me money on Islip, New York to State of Washington flights?

You could potentially save up to 6% on your flight if you consider stops on a Islip, New York to State of Washington flight.

Cheap Islip, New York to State of Washington flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Islip, New York to State of Washington

Fastest flight time	8h 15m
Direct flights	None

The fastest flight from Islip, New York to State of Washington takes 8h 15m

There are no direct flights from Islip, New York to State of Washington. There are no popular flight routes from Islip, New York to State of Washington.

Search flight deals

Frequently asked questions about flying from Islip, New York to Washington

When did momondo last update prices for flights from Islip Long Island Airport to Washington?
Prices for flights from Islip Long Island Airport to Washington were last updated today.
How old do you have to be to fly from Islip Long Island Airport to Washington?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Islip Long Island Airport to Washington.
What documentation or ID do you need to fly to Washington?
The travel and health documents required for your trip to Washington can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Washington. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Why use momondo?

Why should I use momondo to find a flight deal from Islip to Washington?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Islip to Washington. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Islip to Washington with flexible booking policies on momondo?

Flights from Islip to Washington with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Islip to Washington?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Washington from Islip.

I’m not ready to book a flight from Islip to Washington right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Islip to Washington flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.