SEA - ISP

$324 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
$573
Typical prices: $408-$782
Southwest
Fri 12/28Wed 1/3
SEA - ISP • 2 stops
Cheapest one-way
$324
Typical prices: $583-$588
Southwest
Mon 11/12
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, Dec 28 - Sun, Jan 3
Southwest Logo
12:15 am - 4:20 pmSEA  Seattle/Tacoma Intl-ISP Islip Long Island
13h 05m2 stops Chicago Midway Baltimore/Washington
Southwest Logo
4:55 pm - 1:45 amISP  Islip Long Island-SEA Seattle/Tacoma Intl
11h 50m2 stops Baltimore/Washington Las Vegas Harry Reid Intl
$573Southwest
Tue, Nov 10 - Sat, Nov 14
Southwest Logo
6:10 am - 9:45 pmSEA  Seattle/Tacoma Intl-ISP Islip Long Island
12h 35m2 stops Denver Intl Baltimore/Washington
Southwest Logo
12:45 pm - 9:55 pmISP  Islip Long Island-SEA Seattle/Tacoma Intl
12h 10m2 stops Baltimore/Washington Denver Intl
$647Southwest
Thu, Nov 12 - Mon, Nov 16
Southwest Logo
9:10 am - 11:35 pmSEA  Seattle/Tacoma Intl-ISP Islip Long Island
11h 25m2 stops Denver Intl Baltimore/Washington
Southwest Logo
6:05 am - 5:50 pmISP  Islip Long Island-SEA Seattle/Tacoma Intl
14h 45m2 stops Baltimore/Washington Denver Intl
$653Southwest
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 with more confidence.

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

Round-trip flights from Seattle to Islip typically range from $408 to $782. The lowest price found in the past 5 days was $573, on Southwest.

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Key details for Seattle to Islip flights

Cheapest flight

$324
One-way 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 answers about this route, including flight times, airports, airlines and booking tips.

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

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

  • How long is a flight from Seattle to Islip?

    A nonstop flight from Seattle to Islip takes 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 $573 to $653. That means the highest observed fare was about 13% 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 $380, which is 35% below the typical average for this route.

  • 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 averaging $105 for economy cars. Top options include:

    • Budget
    • Enterprise Rent-A-Car
    • Avis
    • National
    • Empire Rent A Car

  • 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).

  • 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.

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

    Yes. Flexible dates can save you up to 48% on flights from Seattle to Islip. Thursday is the cheapest departure day at $409 round-trip on average, while Tuesday is the most expensive at $782, a difference of $373.

    KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • 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.

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 are flexible, aim for a Thursday departure and avoid flying on Tuesday. On this route, Thursday flights average $409, about $373 less than Tuesday fares (48% savings) based on the last 12 months.

More options for your flight from Seattle to Islip

Complete your trip to Islip with a hotel stay or car rental

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