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 50% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 7 different airlines that fly to Seattle 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 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.

$629 Cheap Flights from Islip, New York to Seattle in 2026

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.

5:30 am - 10:45 amISP Islip Long Island-SEA Seattle/Tacoma Intl

8h 15m1 stop Baltimore/Washington

11:00 pm - 12:35 pmSEA Seattle/Tacoma Intl-ISP Islip Long Island

10h 35m2 stops Nashville Intl Baltimore/Washington

$629Southwest

Sat, Sep 26 - Sun, Sep 27

5:30 am - 5:00 pmISP Islip Long Island-SEA Seattle/Tacoma Intl

14h 30m2 stops Baltimore/Washington Nashville Intl

11:05 pm - 12:35 pmSEA Seattle/Tacoma Intl-ISP Islip Long Island

10h 30m2 stops Chicago Midway Baltimore/Washington

$634Southwest

Sat, Sep 26 - Sun, Sep 27

5:30 am - 10:45 amISP Islip Long Island-SEA Seattle/Tacoma Intl

8h 15m1 stop Baltimore/Washington

10:30 pm - 9:40 amSEA Seattle/Tacoma Intl-ISP Islip Long Island

8h 10m1 stop Baltimore/Washington

$684Southwest

Sat, Sep 26 - Sun, Sep 27

12:55 pm - 9:15 pmISP Islip Long Island-SEA Seattle/Tacoma Intl

11h 20m2 stops Baltimore/Washington Phoenix Sky Harbor Intl

10:30 pm - 9:55 amSEA Seattle/Tacoma Intl-ISP Islip Long Island

8h 25m1 stop Baltimore/Washington

$689Southwest

Tue, Sep 15 - Sat, Sep 19

12:55 pm - 8:30 pmISP Islip Long Island-SEA Seattle/Tacoma Intl

10h 35m2 stops Baltimore/Washington Nashville Intl

5:20 pm - 9:55 amSEA Seattle/Tacoma Intl-ISP Islip Long Island

13h 35m2 stops Sacramento Intl Baltimore/Washington

$694Southwest

Tue, Sep 15 - Sat, Sep 19

10:20 am - 5:35 pmISP Islip Long Island-SEA Seattle/Tacoma Intl

10h 15m2 stops Baltimore/Washington Denver Intl

11:05 pm - 12:10 pmSEA Seattle/Tacoma Intl-ISP Islip Long Island

10h 05m2 stops Chicago Midway Baltimore/Washington

$871Southwest

Mon, Sep 28 - Mon, Sep 28

10:20 am - 5:35 pmISP Islip Long Island-SEA Seattle/Tacoma Intl

10h 15m2 stops Baltimore/Washington Denver Intl

10:30 pm - 10:15 amSEA Seattle/Tacoma Intl-ISP Islip Long Island

8h 45m1 stop Baltimore/Washington

$947Southwest

Mon, Sep 28 - Mon, Sep 28

6:05 am - 1:00 pmISP Islip Long Island-SEA Seattle/Tacoma Intl

9h 55m1 stop Baltimore/Washington

10:30 pm - 9:55 amSEA Seattle/Tacoma Intl-ISP Islip Long Island

8h 25m1 stop Baltimore/Washington

$1,002Southwest

Tue, Sep 15 - Sat, Sep 19

7:05 am - 8:37 pmISP Islip Long Island-SEA Seattle/Tacoma Intl

16h 32m3 stops Boston Logan Intl Chicago O'Hare Intl Washington, D.C. Dulles Intl

11:13 pm - 8:15 pmSEA Seattle/Tacoma Intl-ISP Islip Long Island

18h 02m2 stops Chicago O'Hare Intl Boston Logan Intl

$1,008Multiple Airlines

Sat, Sep 26 - Sun, Sep 27

10:20 am - 5:05 pmISP Islip Long Island-SEA Seattle/Tacoma Intl

9h 45m2 stops Baltimore/Washington Chicago Midway

10:30 pm - 9:40 amSEA Seattle/Tacoma Intl-ISP Islip Long Island

8h 10m1 stop Baltimore/Washington

$1,054Southwest

Sun, Sep 13 - Thu, Sep 17

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Southwest flights from Islip, New York to Seattle

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

Southwest

Sep 26

ISP5:30 amIslip Long Island

8h 15m

1 stop

SEA10:45 amSeattle/Tacoma Intl

Sep 27

SEA11:00 pmSeattle/Tacoma Intl

10h 35m

2 stops

ISP12:35 pmIslip Long Island

$629

Southwest

Sep 26

ISP5:30 amIslip Long Island

14h 30m

2 stops

SEA5:00 pmSeattle/Tacoma Intl

Sep 27

SEA11:05 pmSeattle/Tacoma Intl

10h 30m

2 stops

ISP12:35 pmIslip Long Island

$634

Southwest

Sep 26

ISP5:30 amIslip Long Island

8h 15m

1 stop

SEA10:45 amSeattle/Tacoma Intl

Sep 27

SEA10:30 pmSeattle/Tacoma Intl

8h 10m

1 stop

ISP9:40 amIslip Long Island

$684

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

IslipSeattle

ISP Islip Long Island - SEA Seattle/Tacoma Intl

ISPSEA

Islip Long Island

Sat 9/26

5:30 am-10:45 am

1 stop8h 15m

Seattle/Tacoma Intl

Sun 9/27

11:00 pm-12:35 pm

2 stops10h 35m

$629

IslipSeattle

ISP Islip Long Island - SEA Seattle/Tacoma Intl

ISPSEA

Islip Long Island

Sat 9/26

5:30 am-5:00 pm

2 stops14h 30m

Seattle/Tacoma Intl

Sun 9/27

11:05 pm-12:35 pm

2 stops10h 30m

$634

Quickest round-trip

IslipSeattle

ISP Islip Long Island - SEA Seattle/Tacoma Intl

ISPSEA

Islip Long Island

Sat 9/26

5:30 am-10:45 am

1 stop8h 15m

Seattle/Tacoma Intl

Sun 9/27

10:30 pm-9:40 am

1 stop8h 10m

$684

IslipSeattle

ISP Islip Long Island - SEA Seattle/Tacoma Intl

ISPSEA

Islip Long Island

Tue 9/15

12:55 pm-9:15 pm

2 stops11h 20m

Seattle/Tacoma Intl

Sat 9/19

10:30 pm-9:55 am

1 stop8h 25m

$689

IslipSeattle

ISP Islip Long Island - SEA Seattle/Tacoma Intl

ISPSEA

Islip Long Island

Tue 9/15

12:55 pm-8:30 pm

2 stops10h 35m

Seattle/Tacoma Intl

Sat 9/19

5:20 pm-9:55 am

2 stops13h 35m

$694

IslipSeattle

ISP Islip Long Island - SEA Seattle/Tacoma Intl

ISPSEA

Islip Long Island

Mon 9/28

10:20 am-5:35 pm

2 stops10h 15m

Seattle/Tacoma Intl

Mon 9/28

11:05 pm-12:10 pm

2 stops10h 05m

$871

IslipSeattle

ISP Islip Long Island - SEA Seattle/Tacoma Intl

ISPSEA

Islip Long Island

Mon 9/28

10:20 am-5:35 pm

2 stops10h 15m

Seattle/Tacoma Intl

Mon 9/28

10:30 pm-10:15 am

1 stop8h 45m

$947

IslipSeattle

ISP Islip Long Island - SEA Seattle/Tacoma Intl

ISPSEA

Islip Long Island

Tue 9/15

6:05 am-1:00 pm

1 stop9h 55m

Seattle/Tacoma Intl

Sat 9/19

10:30 pm-9:55 am

1 stop8h 25m

$1,002

IslipSeattle

ISP Islip Long Island - SEA Seattle/Tacoma Intl

ISPSEA

Islip Long Island

Sat 9/26

7:05 am-8:37 pm

3 stops16h 32m

Seattle/Tacoma Intl

Sun 9/27

11:13 pm-8:15 pm

2 stops18h 02m

$1,008

IslipSeattle

ISP Islip Long Island - SEA Seattle/Tacoma Intl

ISPSEA

Islip Long Island

Sun 9/13

10:20 am-5:05 pm

2 stops9h 45m

Seattle/Tacoma Intl

Thu 9/17

10:30 pm-9:40 am

1 stop8h 10m

$1,054

Flights are sorted by cheapest round-trip flights first.

Sorted 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 $460. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Monday 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 $534.

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 $428 when looking at flights departing in the evening. Flights to Seattle are more costly at noon, with an average ticket price of $577. 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 25% 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

Best Price Found	$629
Fastest flight time	8h 15m
Direct flights	None

The best flight deal from Islip, New York to Seattle found on momondo in the last 72 hours is $629

The fastest flight from Islip, New York to Seattle takes 8h 15m

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

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

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 8h 15m.
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.

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Kent

Olympia

Redmond

Lakewood

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Fife

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Puyallup

Lynnwood

Cle Elum

Marysville

Kirkland

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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.