$364+ Cheap flights from Islip, NY to Seattle (ISP - SEA)
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 10/23. Fares are subject to change and may not be available on all flights or dates of travel.
Find cheap flights from Islip to Seattle 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 Islip to Seattle
Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to Seattle (SEA). 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 June 12, 2025.
Round-trip from | $364 (Southwest) |
|---|---|
Popular in | December |
Cheapest in | September |
Average price | $482 |
Find flight deals from Islip to Seattle
Cheapest flights from Islip to SeattleExplore the most affordable flight options available from Islip to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.
Explore the most affordable flight options available from Islip to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.
This Southwest deal was found by Cheapflights users on 6/10. 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.
This FlightHub deal was found by Cheapflights users on 6/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Expedia deal was found by Cheapflights users on 6/10. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Cheapflights Fare Finder
Customize your flight search to find flights from Islip to Seattle 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 June 12, 2025.
Use the filters below to find and compare flights from Islip to Seattle that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
IslipSeattle
ISP - SEA
ISPSEA
Islip Long Island
Thu 10/23
12:45 pm-12:25 am
2 stops14h 40m
Seattle/Tacoma Intl
Sun 10/26
7:25 pm-12:00 pm
2 stops13h 35m
IslipSeattle
ISP - SEA
ISPSEA
Islip Long Island
Tue 8/12
8:00 am-11:42 pm
2 stops18h 42m
Seattle/Tacoma Intl
Sun 8/17
7:48 pm-7:52 pm
2 stops21h 04m
IslipSeattle
ISP - SEA
ISPSEA
Islip Long Island
Thu 10/23
11:53 am-7:46 pm
1 stop10h 53m
Seattle/Tacoma Intl
Sun 10/26
6:38 pm-10:37 am
2 stops12h 59m
Best time to book a flight from Islip to Seattle
Have a flexible travel schedule? Discover the best time to fly to Seattle from Islip with our price prediction graph.
Cheapflights Insights
Everything you need to know about your flight from Islip to Seattle
What is the cheapest month to book a flight from Islip, New York to Seattle?
Currently, January is the cheapest month in which you can book a flight from Islip, New York to Seattle (average of $238). Flying from Islip, New York to Seattle in July is currently the most expensive (average of $391). 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.
Rainfall in Seattle by month
Plan your trip to Seattle by taking into account the average rainfall totals by month.
In terms of precipitation, rainfall in Seattle ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit Seattle when rainfall is around 0.7 in.
Temperature in Seattle by month
Plan your trip to Seattle by taking into account the average temperature totals by month.
If weather is an important factor for your trip to Seattle, 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 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).
Reviews of airlines servicing Seattle
Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated June 12, 2025.
Entertainment
Crew
Overall
Comfort
Boarding
Food
Reviews
John,May 2025
PVD - BNA
Entertainment
Crew
Overall
Comfort
Boarding
Food
Reviews
John,May 2025
PVD - BNA
Entertainment
Crew
Overall
Comfort
Boarding
Food
Reviews
John,May 2025
PVD - BNA