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

Southwest is the most popular carrier 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 45% 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.

$229 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.

6:00 am - 5:45 pm

ISP

PDX

14h 45m

2 stops

7:30 pm - 11:45 am

PDX

ISP

13h 15m

2 stops

$452Southwest

Sat, Mar 21 - Sat, Mar 28

4:30 pm - 12:55 am

ISP

SEA

11h 25m

2 stops

9:20 am - 10:10 pm

SEA

ISP

9h 50m

2 stops

$457Southwest

Fri, May 29 - Tue, Jun 2

6:00 am - 8:05 pm

ISP

PDX

17h 05m

2 stops

8:00 am - 11:55 pm

PDX

ISP

12h 55m

2 stops

$463Southwest

Sat, Mar 21 - Fri, Mar 27

12:30 pm - 11:30 pm

ISP

SEA

14h 00m

2 stops

11:55 pm - 1:50 pm

SEA

ISP

10h 55m

2 stops

$466Southwest

Fri, Apr 10 - Mon, Apr 13

12:15 pm - 10:50 pm

ISP

SEA

13h 35m

2 stops

11:55 pm - 11:40 am

SEA

ISP

8h 45m

2 stops

$467Southwest

Thu, Mar 26 - Mon, Mar 30

9:00 am - 7:15 pm

ISP

PDX

13h 15m

2 stops

9:20 pm - 8:20 am

PDX

ISP

8h 00m

1 stop

$472Southwest

Wed, Jun 3 - Sun, Jun 7

2:00 pm - 1:40 am

ISP

SEA

14h 40m

2 stops

11:55 pm - 11:40 am

SEA

ISP

8h 45m

2 stops

$493Southwest

Fri, Mar 6 - Fri, Mar 13

12:30 pm - 11:00 pm

ISP

PDX

13h 30m

2 stops

11:30 pm - 11:50 am

PDX

ISP

9h 20m

2 stops

$499Southwest

Wed, Jun 3 - Sun, Jun 7

5:08 pm - 5:09 pm

ISP

SEA

51h 01m

2 stops

12:42 pm - 11:14 pm

SEA

ISP

31h 32m

2 stops

$543Frontier

Sun, Mar 29 - Thu, Apr 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

$834Multiple Airlines

Sat, Mar 21 - Fri, Mar 27

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

Apr 18

ISP9:20 amIslip Long Island

11h 55m

2 stops

SEA6:15 pmSeattle/Tacoma Intl

Apr 22

SEA11:45 pmSeattle/Tacoma Intl

9h 05m

2 stops

ISP11:50 amIslip Long Island

$417

Southwest

Mar 21

ISP6:00 amIslip Long Island

14h 45m

2 stops

PDX5:45 pmPortland

Mar 28

PDX7:30 pmPortland

13h 15m

2 stops

ISP11:45 amIslip Long Island

$452

Southwest

May 29

ISP4:30 pmIslip Long Island

11h 25m

2 stops

SEA12:55 amSeattle/Tacoma Intl

Jun 2

SEA9:20 amSeattle/Tacoma Intl

9h 50m

2 stops

ISP10:10 pmIslip Long Island

$457

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

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Sat 3/21

6:00 am-5:45 pm

2 stops14h 45m

Portland

Sat 3/28

7:30 pm-11:45 am

2 stops13h 15m

$452

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Fri 5/29

4:30 pm-12:55 am

2 stops11h 25m

Seattle/Tacoma Intl

Tue 6/2

9:20 am-10:10 pm

2 stops9h 50m

$457

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Sat 3/21

6:00 am-8:05 pm

2 stops17h 05m

Portland

Fri 3/27

8:00 am-11:55 pm

2 stops12h 55m

$463

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Fri 4/10

12:30 pm-11:30 pm

2 stops14h 00m

Seattle/Tacoma Intl

Mon 4/13

11:55 pm-1:50 pm

2 stops10h 55m

$466

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Thu 3/26

12:15 pm-10:50 pm

2 stops13h 35m

Seattle/Tacoma Intl

Mon 3/30

11:55 pm-11:40 am

2 stops8h 45m

$467

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Wed 6/3

9:00 am-7:15 pm

2 stops13h 15m

Portland

Sun 6/7

9:20 pm-8:20 am

1 stop8h 00m

$472

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Fri 3/6

2:00 pm-1:40 am

2 stops14h 40m

Seattle/Tacoma Intl

Fri 3/13

11:55 pm-11:40 am

2 stops8h 45m

$493

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Wed 6/3

12:30 pm-11:00 pm

2 stops13h 30m

Portland

Sun 6/7

11:30 pm-11:50 am

2 stops9h 20m

$499

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Sun 3/29

5:08 pm-5:09 pm

2 stops51h 01m

Seattle/Tacoma Intl

Thu 4/2

12:42 pm-11:14 pm

2 stops31h 32m

$543

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Sat 3/21

9:59 am-7:48 pm

1 stop12h 49m

Portland

Fri 3/27

7:00 am-6:44 pm

1 stop8h 44m

$834

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 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	11h 25m
Direct flights	None

The fastest flight from Islip, New York to State of Washington takes 11h 25m

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

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.