HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Islip

$432+ Cheap flights from Seattle to Islip, NY (SEA - ISP)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/18. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ISP
Mar 31 — Apr 71
Mon 3/31
Mon 4/7
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Seattle to Islip with Cheapflights

1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”
2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.
3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Seattle to Islip

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Islip (ISP). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated March 26, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$432
(Southwest)

Popular in

December

Cheapest in

January

Average price

$352
Provider with most accurate pricing for Seattle/Tacoma Intl-Islip Long Island flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Islip Long Island flights.
Search Deals
From Seattle/Tacoma Intl to Islip Long Island
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($7 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2025
Search Deals

Find flight deals from Seattle to Islip

Cheapest flights from Seattle to Islip
Explore the most affordable flight options available from Seattle to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 26, 2025.

This Southwest deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/189:10 pmSEA - ISP
1 stop9h 15mSouthwest
Tue 6/244:40 pmISP - SEA
2 stops11h 35mSouthwest
Deal found 3/25$432
This Mytrip deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/1911:59 pmSEA - ISP
3 stops34h 33mMultiple Airlines
Fri 6/2710:44 amISP - SEA
3 stops28h 58mMultiple Airlines
Deal found 3/25$1,127

Cheapflights Fare Finder

Customize your flight search to find flights from Seattle to Islip that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 26, 2025.
Use the filters below to find and compare flights from Seattle to Islip that are best for you.

Fly from

Seattle

Fly to

Islip

Route

Depart

Return

Price

SeattleIslip

SEA - ISP

SEAISP

Seattle/Tacoma Intl

Wed 6/18

9:10 pm-9:25 am

1 stop9h 15m

Islip Long Island

Tue 6/24

4:40 pm-1:15 am

2 stops11h 35m

$432

SeattleIslip

SEA - ISP

SEAISP

Seattle/Tacoma Intl

Thu 6/19

11:59 pm-1:32 pm

3 stops34h 33m

Islip Long Island

Fri 6/27

10:44 am-12:42 pm

3 stops28h 58m

$1,127

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/25

Compare providers for flights from Seattle to Islip

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Islip in March.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-Islip, New York flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Islip, New York flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Islip, New York flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Islip, New York flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Islip, New York flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Seattle to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Islip

What is the cheapest month to book a flight from Seattle to Islip, New York?

Currently, January is the cheapest month in which you can book a flight from Seattle to Islip, New York (average of $108). Flying from Seattle to Islip, New York in November is currently the most expensive (average of $213). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SEA to ISP?

Find hourly flight availability from Seattle to Islip. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 26, 2025.

When flying from Seattle to Islip, New York, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Rainfall in Islip by month

Plan your trip to Islip by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Islip, New York ranges from 3.3 - 4.4 inches per month. March is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Islip, New York when rainfall is around 3.3 in.

Temperature in Islip by month

Plan your trip to Islip by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Islip, New York, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

Reviews of airlines servicing Islip

Get insights into the airlines that provide service to Islip. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Islip. Reviews last updated March 26, 2025.
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Overall

8.1

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Southwest
8.1
Very good
4,273 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Overall

8.1

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Islip. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • Can I find deals for flights from Seattle to Islip that include hotel bookings?

    Yes. In addition to deals on Seattle to Islip flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Islip?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Islip.

  • Can I find deals for business class flights from Seattle to Islip?

    Yes. Cheapflights offers flight deals from Seattle to Islip by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Seattle to Islip, New York?

    Currently, January is the cheapest month in which you can book a flight from Seattle to Islip, New York (average of $108). Flying from Seattle to Islip, New York in November is currently the most expensive (average of $213). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Southampton
Riverhead

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Seattle to Islip

See prices for flight routes from nearby airports that may be better suited for you.
Seattle to Newark flights
Seattle to John F Kennedy Intl flights
Seattle to LaGuardia flights
Portland to Newark flights
Portland to John F Kennedy Intl flights
Portland to LaGuardia flights
Seattle to Albany flights
Seattle to Syracuse flights
Spokane to John F Kennedy Intl flights
Seattle to Buffalo flights
Seattle to Rochester flights
Spokane to Newark flights
Seattle to White Plains flights
Spokane to LaGuardia flights
Portland to Rochester flights
Portland to Albany flights
Portland to Syracuse flights
Portland to Buffalo flights
Pasco to John F Kennedy Intl flights
Pasco to Newark flights
Spokane to Albany flights
Portland to White Plains flights
Pasco to LaGuardia flights
Seattle to Ithaca flights
Seattle to Binghamton flights
Spokane to Buffalo flights
Bellingham to John F Kennedy Intl flights
Portland to Ithaca flights
Bellingham to Newark flights
Seattle to Elmira flights
Seattle to Watertown flights
Pullman to John F Kennedy Intl flights
Spokane to Syracuse flights
Seattle to Stewart flights
Pullman to Newark flights
Portland to Binghamton flights
Bellingham to LaGuardia flights
Yakima to Newark flights
Walla Walla to Newark flights
Yakima to John F Kennedy Intl flights
Portland to Stewart flights
Portland to Elmira flights
Walla Walla to John F Kennedy Intl flights
Spokane to White Plains flights
Yakima to Albany flights
Bellingham to Buffalo flights
Seattle to Niagara Falls flights
Seattle to Rutland flights
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.