ISP - SEA

$237 Find Cheap Flights from Islip to Seattle - Compare and Save

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Everything you should know

Cheapest round-trip
$418
Typical prices: $372-$965
Southwest
Sun 10/14Fri 10/19
ISP - SEA • 2 stops
Cheapest one-way
$237
Typical prices: $213-$290
Frontier
Fri 10/12
ISP - SEA • 2 stops
Nonstop flights
Not available
There are currently no direct flights between Islip and Seattle. You'll need to take a connecting flight to reach the destination.
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Cheap Flights from Islip to Seattle (ISP-SEA)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Islip to Seattle

Wed, Oct 14 - Mon, Oct 19
Southwest Logo
12:50 pm - 10:40 pmISP  Islip Long Island-SEA Seattle/Tacoma Intl
12h 50m2 stops Baltimore/Washington Denver Intl
Southwest Logo
12:10 am - 3:45 pmSEA  Seattle/Tacoma Intl-ISP Islip Long Island
12h 35m2 stops Chicago Midway Baltimore/Washington
$418Southwest
Tue, Oct 6 - Sun, Oct 11
Southwest Logo
9:40 am - 6:05 pmISP  Islip Long Island-SEA Seattle/Tacoma Intl
11h 25m2 stops Baltimore/Washington Austin Bergstrom
Southwest Logo
9:15 pm - 2:30 pmSEA  Seattle/Tacoma Intl-ISP Islip Long Island
14h 15m2 stops Denver Intl Baltimore/Washington
$493Southwest
Tue, Oct 6 - Sun, Oct 11
Southwest Logo
9:40 am - 6:05 pmISP  Islip Long Island-SEA Seattle/Tacoma Intl
11h 25m2 stops Baltimore/Washington Austin Bergstrom
Southwest Logo
9:15 pm - 2:30 pmSEA  Seattle/Tacoma Intl-ISP Islip Long Island
14h 15m2 stops Denver Intl Baltimore/Washington
$500Southwest
Wed, Oct 7 - Sun, Oct 11
Southwest Logo
12:50 pm - 11:00 pmISP  Islip Long Island-SEA Seattle/Tacoma Intl
13h 10m2 stops Baltimore/Washington Las Vegas Harry Reid Intl
Southwest Logo
9:15 pm - 2:30 pmSEA  Seattle/Tacoma Intl-ISP Islip Long Island
14h 15m2 stops Denver Intl Baltimore/Washington
$525Southwest
Mon, Oct 5 - Sun, Oct 11
Southwest Logo
3:10 pm - 1:00 amISP  Islip Long Island-SEA Seattle/Tacoma Intl
12h 50m2 stops Baltimore/Washington Las Vegas Harry Reid Intl
Southwest Logo
9:15 pm - 2:30 pmSEA  Seattle/Tacoma Intl-ISP Islip Long Island
14h 15m2 stops Denver Intl Baltimore/Washington
$562Southwest
Fri, Oct 9 - Sun, Oct 11
Southwest Logo
3:10 pm - 1:00 amISP  Islip Long Island-SEA Seattle/Tacoma Intl
12h 50m2 stops Baltimore/Washington Las Vegas Harry Reid Intl
Southwest Logo
9:15 pm - 2:30 pmSEA  Seattle/Tacoma Intl-ISP Islip Long Island
14h 15m2 stops Denver Intl Baltimore/Washington
$583Southwest
Fri, Sep 25 - Tue, Sep 29
Southwest Logo
10:20 am - 3:00 pmISP  Islip Long Island-SEA Seattle/Tacoma Intl
7h 40m1 stop Baltimore/Washington
Southwest Logo
10:30 pm - 10:15 amSEA  Seattle/Tacoma Intl-ISP Islip Long Island
8h 45m1 stop Baltimore/Washington
$597Southwest
Fri, Sep 25 - Tue, Sep 29
Southwest Logo
10:20 am - 3:00 pmISP  Islip Long Island-SEA Seattle/Tacoma Intl
7h 40m1 stop Baltimore/Washington
Southwest Logo
6:40 am - 9:10 pmSEA  Seattle/Tacoma Intl-ISP Islip Long Island
11h 30m2 stops Denver Intl Baltimore/Washington
$602Southwest
Wed, Oct 7 - Sun, Oct 11
Southwest Logo
12:50 pm - 10:40 pmISP  Islip Long Island-SEA Seattle/Tacoma Intl
12h 50m2 stops Baltimore/Washington Denver Intl
Southwest Logo
9:15 pm - 2:30 pmSEA  Seattle/Tacoma Intl-ISP Islip Long Island
14h 15m2 stops Denver Intl Baltimore/Washington
$603Southwest
Fri, Sep 25 - Tue, Sep 29
Southwest Logo
4:05 pm - 11:00 pmISP  Islip Long Island-SEA Seattle/Tacoma Intl
9h 55m2 stops Baltimore/Washington Denver Intl
Southwest Logo
6:40 am - 9:10 pmSEA  Seattle/Tacoma Intl-ISP Islip Long Island
11h 30m2 stops Denver Intl Baltimore/Washington
$607Southwest
Booking Insights

Price, demand and travel trends for Islip to Seattle flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights from Islip to Seattle with more confidence.

How much is a round-trip flight from Islip to Seattle?

Round-trip flights from Islip to Seattle start at $418. Prices are typical for this route right now, with typical round-trip fares ranging from $372 to $965. The lowest price found in the past 5 days was $418 on Southwest.

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Key details for Islip to Seattle flights

Cheapest flight

$237
Flight from Islip to Seattle

When to book flights from Islip to Seattle

Are your dates flexible? Find out the best times to travel from Islip to Seattle based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price

Your Islip to Seattle flight questions, answered

Find helpful route details based on KAYAK data, including flight times, airports, airlines and booking questions.

  • Which airports can I use when flying from Islip to Seattle?

    Flights from Islip to Seattle usually depart from Islip Long Island (ISP) and arrive at Seattle/Tacoma Intl (SEA).

  • What cabin classes can I book on flights from Islip to Seattle?

    Only Economy Class is available on flights from Islip to Seattle.

  • Which airports do connecting flights from Islip to Seattle pass through?

    Most connecting flights from Islip to Seattle pass through Boston Logan Intl (BOS), which handles 100% of one-stop traffic on this route. Other layover airports each see under 5%.

  • Can I save money by using flexible dates for flights from Islip to Seattle?

    On the Islip to Seattle route, being flexible with your departure day can save you up to 62%. Saturday is the cheapest day at $372 round-trip on average, while Wednesday is the most expensive at $965: a $593 difference. Cheaper weekend fares like these are typical of routes dominated by weekday business travel.

  • What popular places can I visit in Seattle?

    Some of the most popular sights in Seattle are Pike Place Market, Pier 66 and Lumen Field. These are among the most viewed places in Seattle on KAYAK.

  • How long is a flight from Islip to Seattle?

    A nonstop flight from Islip to Seattle takes 0h 00m, covering 2,440 miles.

  • Do I need a passport to fly from Islip to Seattle?

    No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID, or another TSA-accepted form of identification.

  • Have flight prices from Islip to Seattle changed much recently?

    Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $418 to $3,094. That means the highest observed fare was about 7x higher than the lowest one.

  • How are flight prices from Islip to Seattle looking right now?

    One-way fares from Islip to Seattle are currently higher than usual. Average one-way flight prices are about $419, which is 47% above the typical average for this route.

  • What is the time difference between Islip and Seattle?

    Seattle is 3 hours behind Islip (Pacific Time vs Eastern Time). Plan for the time shift when scheduling connections or first-day activities.

  • What car rental options are available at Seattle/Tacoma Intl Airport (SEA)?

    Seattle/Tacoma Intl Airport (SEA) hosts 5 major car rental companies, with daily rates starting from around $4 for economy cars. Top options include:
    • Fox
    • Europcar
    • Thrifty
    • Budget
    • Dollar

Your guide to booking Islip to Seattle flights

Get tips on when to book, when to fly and what to know before your trip.

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