What airlines fly to Seattle?

Alaska Airlines, United Airlines and Delta are the top three most popular airlines that fly to Seattle from Islip, New York according to our data. Alaska Airlines is the first choice among our users, with 47% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 10 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Islip Long Island to Seattle/Tacoma Intl?

Southwest is the most popular carrier operating from Islip Long Island to Seattle/Tacoma Intl

When did momondo last update prices for flights from Islip Long Island Airport to Seattle/Tacoma Intl Airport?

Prices for flights from Islip Long Island Airport to Seattle/Tacoma Intl Airport are refreshed on a daily basis.

How old do you have to be to fly from Islip Long Island Airport to Seattle/Tacoma Intl Airport?

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 Seattle/Tacoma Intl Airport.

What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

The required travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$229 Cheap Flights from Islip to Seattle in 2026

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Find the cheapest flights from Islip, New York to Seattle

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

12:30 pm - 9:50 pm

ISP

SEA

12h 20m

2 stops

9:25 pm - 11:45 am

SEA

ISP

11h 20m

1 stop

$468Southwest

Fri, Jun 5 - Sat, Jun 13

12:30 pm - 9:50 pm

ISP

SEA

12h 20m

2 stops

7:35 pm - 11:45 am

SEA

ISP

13h 10m

2 stops

$473Southwest

Fri, Jun 5 - Sat, Jun 13

6:00 am - 1:55 pm

ISP

SEA

10h 55m

2 stops

11:05 pm - 2:55 pm

SEA

ISP

12h 50m

2 stops

$479Southwest

Fri, Jul 3 - Sat, Jul 18

6:00 am - 1:55 pm

ISP

SEA

10h 55m

2 stops

9:25 pm - 11:45 am

SEA

ISP

11h 20m

1 stop

$480Southwest

Fri, Jul 3 - Sat, Jul 18

6:00 am - 1:55 pm

ISP

SEA

10h 55m

2 stops

9:25 pm - 8:20 am

SEA

ISP

7h 55m

1 stop

$488Southwest

Fri, Jul 3 - Wed, Jul 15

6:00 am - 2:15 pm

ISP

SEA

11h 15m

2 stops

6:55 pm - 8:20 am

SEA

ISP

10h 25m

2 stops

$493Southwest

Sun, Jun 28 - Wed, Jul 8

6:00 am - 2:15 pm

ISP

SEA

11h 15m

2 stops

9:25 pm - 8:20 am

SEA

ISP

7h 55m

1 stop

$498Southwest

Sun, Jun 28 - Wed, Jul 8

12:30 pm - 6:30 pm

ISP

SEA

9h 00m

1 stop

9:25 pm - 11:45 am

SEA

ISP

11h 20m

1 stop

$503Southwest

Fri, Jun 5 - Sat, Jun 13

12:30 pm - 6:30 pm

ISP

SEA

9h 00m

1 stop

9:25 pm - 8:20 am

SEA

ISP

7h 55m

1 stop

$507Southwest

Fri, Jul 3 - Wed, Jul 15

12:30 pm - 6:30 pm

ISP

SEA

9h 00m

1 stop

9:25 pm - 11:45 am

SEA

ISP

11h 20m

1 stop

$512Southwest

Fri, Jul 3 - Sat, Jul 18

Southwest flights from Islip, New York to Seattle

Our best Southwest deals on Islip, New York to Seattle flight tickets

Southwest

Jun 5

ISP12:30 pmIslip Long Island

12h 20m

2 stops

SEA9:50 pmSeattle/Tacoma Intl

Jun 13

SEA9:25 pmSeattle/Tacoma Intl

11h 20m

1 stop

ISP11:45 amIslip Long Island

$468

Southwest

Jun 5

ISP12:30 pmIslip Long Island

12h 20m

2 stops

SEA9:50 pmSeattle/Tacoma Intl

Jun 13

SEA7:35 pmSeattle/Tacoma Intl

13h 10m

2 stops

ISP11:45 amIslip Long Island

$473

Southwest

Jul 3

ISP6:00 amIslip Long Island

10h 55m

2 stops

SEA1:55 pmSeattle/Tacoma Intl

Jul 18

SEA11:05 pmSeattle/Tacoma Intl

12h 50m

2 stops

ISP2:55 pmIslip Long Island

$479

Fly from

Fly to

Route

Depart

Return

Price

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Fri 6/5

12:30 pm-9:50 pm

2 stops12h 20m

Seattle/Tacoma Intl

Sat 6/13

9:25 pm-11:45 am

1 stop11h 20m

$468

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Fri 6/5

12:30 pm-9:50 pm

2 stops12h 20m

Seattle/Tacoma Intl

Sat 6/13

7:35 pm-11:45 am

2 stops13h 10m

$473

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Fri 7/3

6:00 am-1:55 pm

2 stops10h 55m

Seattle/Tacoma Intl

Sat 7/18

11:05 pm-2:55 pm

2 stops12h 50m

$479

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Fri 7/3

6:00 am-1:55 pm

2 stops10h 55m

Seattle/Tacoma Intl

Sat 7/18

9:25 pm-11:45 am

1 stop11h 20m

$480

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Fri 7/3

6:00 am-1:55 pm

2 stops10h 55m

Seattle/Tacoma Intl

Wed 7/15

9:25 pm-8:20 am

1 stop7h 55m

$488

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Sun 6/28

6:00 am-2:15 pm

2 stops11h 15m

Seattle/Tacoma Intl

Wed 7/8

6:55 pm-8:20 am

2 stops10h 25m

$493

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Sun 6/28

6:00 am-2:15 pm

2 stops11h 15m

Seattle/Tacoma Intl

Wed 7/8

9:25 pm-8:20 am

1 stop7h 55m

$498

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Fri 6/5

12:30 pm-6:30 pm

1 stop9h 00m

Seattle/Tacoma Intl

Sat 6/13

9:25 pm-11:45 am

1 stop11h 20m

$503

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Fri 7/3

12:30 pm-6:30 pm

1 stop9h 00m

Seattle/Tacoma Intl

Wed 7/15

9:25 pm-8:20 am

1 stop7h 55m

$507

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

Fri 7/3

12:30 pm-6:30 pm

1 stop9h 00m

Seattle/Tacoma Intl

Sat 7/18

9:25 pm-11:45 am

1 stop11h 20m

$512

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 resultsSorted by cheapest first

How to get the cheapest flight ticket from Islip, New York to Seattle

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

What is the cheapest day to depart on your flight to Seattle?

On average, the least expensive day to fly to Seattle from Islip, New York is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as $451. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Sunday is the most expensive day to depart from Islip, New York because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $528.

What is the cheapest time of day to depart on your flight to Seattle?

Flying to Seattle from Islip, New York in the evening is the least expensive time of day to depart. momondo users have found prices as low as $372 when looking at flights departing in the evening. Flights to Seattle are more costly at noon, with an average ticket price of $572. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

Can stopping save me money on Islip, New York to Seattle flights?

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

When to book flights from Islip, New York to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Islip, New York to Seattle according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Islip, New York to Seattle (ISP to SEA) flight deals and tips

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

Fastest flight time	10h 55m
Direct flights	None

The fastest flight from Islip, New York to Seattle takes 10h 55m

There are no direct flights from Islip, New York to Seattle. There are no popular flight routes from Islip, New York to Seattle.

Search flight deals

How far is Islip Long Island to Seattle/Tacoma Intl by plane?
Seattle/Tacoma Intl is 2436.8 mi away from Islip Long Island. By plane, this route typically takes 10h 55m.
When did momondo last update prices for flights from Islip Long Island Airport to Seattle/Tacoma Intl Airport?
Prices for flights from Islip Long Island Airport to Seattle/Tacoma Intl Airport are refreshed on a daily basis.
How old do you have to be to fly from Islip Long Island Airport to Seattle/Tacoma Intl Airport?
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 Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The required travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Tacoma

Leavenworth

SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Marysville

Redmond

Cle Elum

Puyallup

Lakewood

Tukwila

Federal Way

Fife

Westport

Kirkland

Centralia

Tumwater

Why use momondo?

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

Finding the right flight to Seattle from Islip is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Seattle quick and easy, saving you time and money.

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

Yes. momondo enables you to select and highlight flights to Seattle from Islip with this policy.

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

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 Seattle from Islip.

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

If you are simply researching potential flights to Seattle, momondo offers a useful price alert feature which will track prices for flights to Seattle from Islip and alert you when they change.