$164 Cheap Flights from Islip (ISP) to Seattle (SEA)

View $164 flight on Tue, Oct 7, 2025Opens in a new window

Popular airlines from MacArthur Airport (ISP) to Seattle-Tacoma International Airport (SEA)

Cheap Flights from Islip to Seattle (ISP-SEA)

Prices were available within the past 7 days and start at $164 for one-way flights and $357 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Tue, Nov 11 - Tue, Nov 18
ISP
Islip
SEA
Seattle
$357 Roundtrip, found 4 days ago
$357
Roundtrip
found 4 days ago
Select Southwest Airlines flight, departing Tue, Nov 11 from Islip to Seattle, returning Tue, Nov 18, priced at $357 found 4 days ago
Southwest Airlines
Tue, Nov 11 - Tue, Nov 18
ISP
Islip
SEA
Seattle
$362 Roundtrip, found 4 days ago
$362
Roundtrip
found 4 days ago
Select Southwest Airlines flight, departing Tue, Nov 11 from Islip to Seattle, returning Tue, Nov 18, priced at $362 found 4 days ago
JetBlue Airways
Tue, Sep 16 - Mon, Oct 6
ISP
Islip
SEA
Seattle
$366 Roundtrip, found 5 days ago
$366
Roundtrip
found 5 days ago
Select JetBlue Airways flight, departing Tue, Sep 16 from Islip to Seattle, returning Mon, Oct 6, priced at $366 found 5 days ago
Southwest Airlines
Fri, Oct 24 - Wed, Oct 29
ISP
Islip
SEA
Seattle
$367 Roundtrip, found 1 day ago
$367
Roundtrip
found 1 day ago
Select Southwest Airlines flight, departing Fri, Oct 24 from Islip to Seattle, returning Wed, Oct 29, priced at $367 found 1 day ago
Southwest Airlines
Fri, Oct 24 - Wed, Oct 29
ISP
Islip
SEA
Seattle
$372 Roundtrip, found 1 day ago
$372
Roundtrip
found 1 day ago
Select Southwest Airlines flight, departing Fri, Oct 24 from Islip to Seattle, returning Wed, Oct 29, priced at $372 found 1 day ago
Southwest Airlines
Fri, Oct 24 - Wed, Oct 29
ISP
Islip
SEA
Seattle
$378 Roundtrip, found 1 day ago
$378
Roundtrip
found 1 day ago
Select Southwest Airlines flight, departing Fri, Oct 24 from Islip to Seattle, returning Wed, Oct 29, priced at $378 found 1 day ago
Southwest Airlines
Fri, Dec 5 - Wed, Dec 10
ISP
Islip
SEA
Seattle
$383 Roundtrip, found 3 days ago
$383
Roundtrip
found 3 days ago
Select Southwest Airlines flight, departing Fri, Dec 5 from Islip to Seattle, returning Wed, Dec 10, priced at $383 found 3 days ago
JetBlue Airways
Tue, Oct 7 - Tue, Oct 21
ISP
Islip
SEA
Seattle
$386 Roundtrip, found 5 days ago
$386
Roundtrip
found 5 days ago
Select JetBlue Airways flight, departing Tue, Oct 7 from Islip to Seattle, returning Tue, Oct 21, priced at $386 found 5 days ago
Southwest Airlines
Fri, Oct 24 - Wed, Oct 29
ISP
Islip
SEA
Seattle
$387 Roundtrip, found 1 day ago
$387
Roundtrip
found 1 day ago
Select Southwest Airlines flight, departing Fri, Oct 24 from Islip to Seattle, returning Wed, Oct 29, priced at $387 found 1 day ago
Southwest Airlines
Fri, Dec 5 - Wed, Dec 10
ISP
Islip
SEA
Seattle
$388 Roundtrip, found 3 days ago
$388
Roundtrip
found 3 days ago
Select Southwest Airlines flight, departing Fri, Dec 5 from Islip to Seattle, returning Wed, Dec 10, priced at $388 found 3 days ago

Alternative airports near Seattle

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Seattle - Tacoma Intl. SEA. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $529
SEA
Seattle - Tacoma Intl.
Cheapest
Average driving time to city center20 min
Flights from $529
Flights from Islip (ISP) to Seattle (SEA)
Origin airport
MacArthur
Destination airport
Seattle - Tacoma Intl.
Airlines serving
JetBlue Airways, Southwest Airlines
Roundtrip price
$357
Distance
2441 mi

Islip to Seattle Flights

The cheapest times to fly from Islip to Seattle

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Islip to Seattle are during the month of November. You can find some of the cheapest flights from Islip to Seattle with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Islip to Seattle

Sunday is one of the best days to book for cheap flights from Islip to Seattle: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Islip to Seattle

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Islip to Seattle in 2025. You can also book with separate airlines for your outbound and return journeys, from $164 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Islip to Seattle flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Islip to Seattle airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from MacArthur Airport (ISP) to Seattle - Tacoma Intl. Airport (SEA) cost?
Secure a cheap one-way flight from $164 or cheap return flight from $357 from MacArthur Airport (ISP) to Seattle - Tacoma Intl. Airport (SEA) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from MacArthur Airport (ISP) to Seattle - Tacoma Intl. Airport (SEA)?
The cheapest month to fly from ISP to SEA is November, when demand is low. Off-peak season is typically when airlines offer lower prices between these airports.
Which airlines fly direct from MacArthur Airport (ISP) to Seattle - Tacoma Intl. Airport (SEA)?
You can't fly directly from Islip, NY (ISP-MacArthur) to Seattle - Tacoma Intl. Airport (SEA). However, you'll find other airports offering nonstop flights. Hop on your plane at John F. Kennedy Intl. Airport (JFK) and head straight to Seattle without any detours.
What is the cheapest airline that flies from MacArthur Airport (ISP) to Seattle - Tacoma Intl. Airport (SEA)?
To find the cheapest airline flying from ISP to SEA, use Expedia's filter tool. Tailor your search based on what matters most to you, such as preferred carriers and seat class. You can then sort your results by "Price (lowest to highest)" to list the most affordable options first.
How many flights per day from MacArthur Airport (ISP) to Seattle - Tacoma Intl. Airport (SEA)?
You'll need to hop on a flight with a layover if you're traveling from MacArthur Airport (ISP) to Seattle - Tacoma Intl. Airport (SEA). There are no daily direct flights on this route. However, just filter your search to include one or two stops to discover an option that works for you.
What day of the week has the most flights from ISP to SEA?
Generally you'll find the greatest selection of flight options on a Friday. Tuesdays tend to be the quietest.* But this can vary based on the time of year, airline and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from MacArthur Airport (ISP) to Seattle - Tacoma Intl. Airport (SEA)?
To touch down at Seattle - Tacoma Intl. Airport (SEA) without delays, opt for a flight that leaves MacArthur Airport (ISP) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from MacArthur Airport (ISP) to Seattle - Tacoma Intl. Airport (SEA) last-minute?
Last-minute bookings from ISP to SEA are typically more expensive. For the lowest rates, start searching for flights ahead of time. That being said, if you're flexible with your travel dates, it's possible to score a cheap ticket right before your journey.
Is it cheaper to book an ISP to SEA flight and hotel package?
Securing an ISP to SEA flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels all in one place. Choose from our extensive range of hotels and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from MacArthur Airport (ISP) to Seattle - Tacoma Intl. Airport (SEA)?
It's usually possible to reschedule or cancel your ISP to SEA flight. However, if it's been more than 24 hours since booking, additional charges may apply. Check your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find more information on our Customer Service portal.

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*Available to One Key members.