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

Southwest and Frontier 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 44% 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 many operators does momondo search for flights from Islip Long Island Airport to Washington?

As of December 2025, there is 1 operator available to choose from for flights from Islip Long Island Airport to Washington.

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.

$454 Cheap Flights from Islip to Washington in 2025/26

1 adult

0 bags

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

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.

5:40 am - 3:15 pm

ISP

SEA

12h 35m2 stops

9:55 am - 9:55 pm

SEA

ISP

9h 00m2 stops

$695Southwest

Fri, Jan 2 - Wed, Jan 7

12:30 pm - 9:30 pm

ISP

SEA

12h 00m1 stop

11:15 pm - 7:45 pm

SEA

ISP

17h 30m2 stops

$1,492Multiple Airlines

Fri, Jan 2 - Wed, Jan 7

12:30 pm - 9:30 pm

ISP

SEA

12h 00m1 stop

7:55 am - 7:45 pm

SEA

ISP

8h 50m1 stop

$1,494Multiple Airlines

Fri, Jan 2 - Wed, Jan 7

8:35 pm - 7:11 pm

ISP

SEA

25h 36m2 stops

11:25 pm - 11:05 am

SEA

ISP

8h 40m1 stop

$2,150Multiple Airlines

Mon, Dec 29 - Fri, Jan 2

12:30 pm - 9:30 pm

ISP

SEA

12h 00m1 stop

11:25 pm - 4:10 pm

SEA

ISP

13h 45m1 stop

$2,365Multiple Airlines

Mon, Dec 29 - Fri, Jan 2

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

Jan 2

ISP5:40 amIslip Long Island

12h 35m

2 stops

SEA3:15 pmSeattle/Tacoma Intl

Jan 7

SEA9:55 amSeattle/Tacoma Intl

9h 00m

2 stops

ISP9:55 pmIslip Long Island

$695

Find similar

Southwest

Dec 18

ISP3:25 pmIslip Long Island

11h 50m

2 stops

PDX12:15 amPortland

Dec 21

PDX10:05 amPortland

10h 50m

2 stops

ISP11:55 pmIslip Long Island

$997

Find similar

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

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Fri 1/2

5:40 am-3:15 pm

2 stops12h 35m

Seattle/Tacoma Intl

Wed 1/7

9:55 am-9:55 pm

2 stops9h 00m

$695

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Fri 1/2

12:30 pm-9:30 pm

1 stop12h 00m

Seattle/Tacoma Intl

Wed 1/7

11:15 pm-7:45 pm

2 stops17h 30m

$1,492

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Fri 1/2

12:30 pm-9:30 pm

1 stop12h 00m

Seattle/Tacoma Intl

Wed 1/7

7:55 am-7:45 pm

1 stop8h 50m

$1,494

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Mon 12/29

8:35 pm-7:11 pm

2 stops25h 36m

Seattle/Tacoma Intl

Fri 1/2

11:25 pm-11:05 am

1 stop8h 40m

$2,150

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Mon 12/29

12:30 pm-9:30 pm

1 stop12h 00m

Seattle/Tacoma Intl

Fri 1/2

11:25 pm-4:10 pm

1 stop13h 45m

$2,365

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Mon 12/29

1:35 pm-12:30 am

2 stops13h 55m

$454

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Mon 12/29

8:35 pm-12:30 pm

2 stops42h 55m

$494

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Sun 12/28

8:35 pm-11:43 am

2 stops42h 08m

$753

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Mon 12/29

12:30 pm-8:36 pm

1 stop11h 06m

$1,027

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Mon 12/29

12:30 pm-9:30 pm

1 stop12h 00m

$1,463

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 11 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 50m
Direct flights	None

The fastest flight from Islip, New York to State of Washington takes 11h 50m

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 many operators does momondo search for flights from Islip Long Island Airport to Washington?
As of December 2025, there is 1 operator available to choose from for flights from Islip Long Island Airport to Washington.
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.

Best airlines flying from Islip, New York to State of Washington

Compare and see reviews for airlines that fly from Islip, New York to State of Washington with momondo

Airline	Rating	Free Cancellation	Price
Southwest	PriceFrom $356	Free Cancellation	Rating 7.9 4,250 reviews		Search Southwest flights

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.

An easier way to manage your State of Washington trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Start using Trips

Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

1 adult

Wed 1/14

Wed 1/21

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Washington

Popular cities in Washington

Flights to New Yorkfrom $34

Flights to Los Angelesfrom $44

Flights to Miamifrom $49

Flights to Chicagofrom $50

Flights to Orlandofrom $48

Flights to San Franciscofrom $55

Flights to Las Vegasfrom $48

Flights to Washington, D.C.from $57

Flights to Bostonfrom $52

Flights to Atlantafrom $48

Flights to Dallasfrom $56

Flights to Seattlefrom $58

Cheap flights from Islip, New York to Washington from $454

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Islip, New York to Washington departing on 12/29. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from Islip, New York to Washington

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Southwest flights from Islip, New York to State of Washington

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

momondo Fare Finder

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

See travel insights to Washington from

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

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.

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

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

What airlines fly to State of Washington?

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

Direct flights

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

How many operators does momondo search for flights from Islip Long Island Airport to Washington?

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

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

Best airlines flying from Islip, New York to State of Washington

Compare and see reviews for airlines that fly from Islip, New York to State of Washington with momondo

Why use momondo?

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

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

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

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

An easier way to manage your State of Washington trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Washington

Popular cities in Washington

Popular flights according to clicks in the last 7 days on momondo