SEA - ISP

$422 Find Cheap Flights from Seattle to Islip - Compare and Save

1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$622
Typical prices: $408-$782
Southwest
Fri 9/28Tue 10/2
SEA - ISP • 1 stop
Cheapest one-way
$422
Typical prices: $583-$583
Frontier
Fri 11/23
SEA - ISP • 2 stops
Nonstop flights
Not available
There are currently no direct flights between Seattle and Islip. You'll need to take a connecting flight to reach the destination.
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Cheap Flights from Seattle to Islip (SEA-ISP)

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

Recent round-trip flight deals from Seattle to Islip

Mon, Sep 28 - Fri, Oct 2
Southwest Logo
10:30 pm - 10:15 amSEA  Seattle/Tacoma Intl-ISP Islip Long Island
8h 45m1 stop Baltimore/Washington
Southwest Logo
3:10 pm - 1:20 amISP  Islip Long Island-SEA Seattle/Tacoma Intl
13h 10m2 stops Baltimore/Washington Las Vegas Harry Reid Intl
$622Southwest
Mon, Sep 28 - Fri, Oct 2
Southwest Logo
6:15 am - 9:35 pmSEA  Seattle/Tacoma Intl-ISP Islip Long Island
12h 20m2 stops Phoenix Sky Harbor Intl Orlando
Southwest Logo
3:10 pm - 1:20 amISP  Islip Long Island-SEA Seattle/Tacoma Intl
13h 10m2 stops Baltimore/Washington Las Vegas Harry Reid Intl
$627Southwest
Mon, Sep 28 - Fri, Oct 2
Multiple Airlines Logo
11:42 pm - 10:56 amSEA  Seattle/Tacoma Intl-ISP Islip Long Island
8h 14m1 stop Boston Logan Intl
Multiple Airlines Logo
7:05 am - 1:15 pmISP  Islip Long Island-SEA Seattle/Tacoma Intl
9h 10m1 stop Boston Logan Intl
$1,184Multiple Airlines
Booking Insights

Price, demand and travel trends for Seattle to Islip flights

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

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

Round-trip flights from Seattle to Islip start at $622. Prices are typical for this route right now, with typical round-trip fares ranging from $408 to $782. The lowest price found in the past 5 days was $622 on Southwest.

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Key details for Seattle to Islip flights

Cheapest flight

$422
Flight from Seattle to Islip

When to book flights from Seattle to Islip

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

Your Seattle to Islip 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 Seattle to Islip?

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

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

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

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

    Most connecting flights from Seattle to Islip pass through Baltimore/Washington (BWI), 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 Seattle to Islip?

    Yes. Being flexible with your travel dates can save you up to 57% on the Seattle to Islip route. Thursday is the cheapest departure day at $409 round-trip on average, while Friday is the most expensive at $942, a difference of $533. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • How long is a flight from Seattle to Islip?

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

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

    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 Seattle to Islip changed much recently?

    Yes. Based on fares seen in the past 5 days, round-trip prices on this route varied from about $622 to $1,184. That means the highest observed fare was about 90% higher than the lowest one.

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

    One-way fares from Seattle to Islip are currently lower than usual. Average one-way flight prices are about $422, which is 28% below the typical average for this route.

  • What is the time difference between Seattle and Islip?

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

  • What car rental options are available at Islip Long Island Airport (ISP)?

    Islip Long Island Airport (ISP) hosts 5 major car rental companies, with daily rates starting from around $36 for economy cars. Top options include:
    • Budget
    • Enterprise Rent-A-Car
    • Avis
    • National
    • Empire Rent A Car

Your guide to booking Seattle to Islip flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your dates can be flexible, aim for a Thursday departure instead of Friday. On this route, Thursday flights average $409 - about $533 less than Friday (57% savings) based on the last 12 months.

More options for your flight from Seattle to Islip

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