In terms of precipitation, rainfall in State of Washington 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 State of Washington when rainfall is around 0.7 in.

If weather is an important factor for your trip to State of Washington, 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).

How far in advance should I book a flight from Islip, New York to State of Washington?

Travelers have found it’s best to book a flight 50 days in advance to save up to 75% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 50 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from Islip, New York to State of Washington 1-2 weeks in advance for as low as $469, or $687 for flights within the next 24 hours.

What is the cheapest month to fly from Islip, New York to State of Washington?

September is one of the best times of the year to fly to State of Washington from Islip, New York. Prices for September average $416 per person but you can even find prices for as low as $169. The most expensive prices can be found in the month of December. Opting for a September flight can save you 36% on your journey compared to booking in December

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

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Islip, New York to State of Washington as you normally would.

What airport do you fly from for flights from Islip to Washington?

Most people fly from Islip Long Island (ISP) if they book a flight from Islip to Washington. Islip Long Island is conveniently located just 7.2 mi from Islip’s city center.

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

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

How can I find direct flights from Islip to Washington?

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

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

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

$368+ Flights from Islip, NY to Washington

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Cheap flight deals from Islip to Washington

Round-trip from	$368 (Southwest)
Popular in	December
Cheapest in	September
Average price	$507

From Islip Long Island to Washington

Search Deals

Highest demand for flights based on searches. 5% potential increase in price ($24 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in July 2025

Search Deals

Find flight deals from Islip to Washington

Cheapest flights from Islip to Washington
Explore the most affordable flight options available from Islip to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 30, 2025.

vie. 8/293:05 pmISP - SEA

1 stop9h 25mSouthwest

sáb. 9/68:10 amSEA - ISP

2 stops10h 30mSouthwest

Deal found 7/30

$368

mié. 10/2211:40 amISP - PDX

2 stops12h 40mSouthwest

mié. 10/295:10 amPDX - ISP

2 stops13h 55mSouthwest

Deal found 7/30

$373

mar. 8/128:00 amISP - SEA

2 stops18h 02mMultiple Airlines

mar. 8/1911:05 pmSEA - ISP

1 stop21h 36mMultiple Airlines

Deal found 7/29

$766

jue. 9/112:19 pmISP - PDX

3 stops31h 45mMultiple Airlines

mar. 9/1612:07 pmPDX - ISP

3 stops28h 34mMultiple Airlines

Deal found 7/30

$777

Best flights from Islip to Washington
Discover carefully curated flight deals from Islip to Washington that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated julio 30, 2025.

vie. 8/293:05 pmISP - SEA

1 stop9h 25mSouthwest

sáb. 9/68:10 amSEA - ISP

2 stops10h 30mSouthwest

Deal found 7/30

$368

mié. 10/2211:40 amISP - PDX

2 stops12h 40mSouthwest

mié. 10/295:10 amPDX - ISP

2 stops13h 55mSouthwest

Deal found 7/30

$373

mar. 8/128:00 amISP - SEA

2 stops18h 02mMultiple Airlines

mar. 8/1911:05 pmSEA - ISP

1 stop21h 36mMultiple Airlines

Deal found 7/29

$766

jue. 9/112:19 pmISP - PDX

3 stops31h 45mMultiple Airlines

mar. 9/1612:07 pmPDX - ISP

3 stops28h 34mMultiple Airlines

Deal found 7/30

$777

Last-minute flights from Islip to Washington
Discover last-minute flight deals from Islip to Washington. Data last updated julio 30, 2025 and is based on user searches.

mar. 8/128:00 amISP - SEA

2 stops18h 02mMultiple Airlines

mar. 8/1911:05 pmSEA - ISP

1 stop21h 36mMultiple Airlines

Deal found 7/29

$766

jue. 8/2112:10 pmISP - PDX

2 stops11h 40mSouthwest

lun. 8/257:45 amPDX - ISP

2 stops12h 10mSouthwest

Deal found 7/29

$439

jue. 8/217:39 pmISP - PDX

3 stops21h 52mMultiple Airlines

lun. 8/256:00 pmPDX - ISP

2 stops23h 01mMultiple Airlines

Deal found 7/29

$960

vie. 8/293:05 pmISP - SEA

1 stop9h 25mSouthwest

sáb. 9/68:10 amSEA - ISP

2 stops10h 30mSouthwest

Deal found 7/30

$368

One-way flights from Islip to Washington
Search for one-way flight options from Islip to Washington. Find affordable one-way fares based on user searches. Data last updated julio 30, 2025.

mar. 8/2611:53 amISP - SEA

2 stops13h 27mMultiple Airlines

Deal found 7/29

$1,088

Fly from

Fly to

Route

Depart

Return

Price

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

vie. 8/29

3:05 pm-9:30 pm

1 stop9h 25m

Seattle/Tacoma Intl

sáb. 9/6

8:10 am-9:40 pm

2 stops10h 30m

$368

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

mié. 10/22

11:40 am-9:20 pm

2 stops12h 40m

Portland

mié. 10/29

5:10 am-10:05 pm

2 stops13h 55m

$373

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

mar. 8/12

8:00 am-11:02 pm

2 stops18h 02m

Seattle/Tacoma Intl

mar. 8/19

11:05 pm-11:41 pm

1 stop21h 36m

$766

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

jue. 9/11

2:19 pm-7:04 pm

3 stops31h 45m

Portland

mar. 9/16

12:07 pm-7:41 pm

3 stops28h 34m

$777

IslipSeattle

ISP - SEA

ISPSEA

Islip Long Island

mar. 8/26

11:53 am-10:20 pm

2 stops13h 27m

$1,088

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Best time to book a flight from Islip to Washington

Have a flexible travel schedule? Discover the best time to fly to Washington from Islip 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 Islip to Washington

What is the cheapest month to book a flight from Islip, New York to State of Washington?

Currently, January is the cheapest month in which you can book a flight from Islip, New York to State of Washington (average of $238). Flying from Islip, New York to State of Washington in June is currently the most expensive (average of $389). 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.

Reviews of airlines servicing Washington

Read through reviews of airlines operating flights from Islip to Washington, such as Southwest. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.0

Very good

4,241 reviews

Reviews

1 / 20

8.0

Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

Southwest

8.0

Very good

4,241 reviews

Southwest

8.0

Very good

4,241 reviews

Reviews

1 / 20

8.0

Excellent

Gina,Jul 2025

LAS - DEN

Related info for your journey

What airport do you fly from for flights from Islip to Washington?
Most people fly from Islip Long Island (ISP) if they book a flight from Islip to Washington. Islip Long Island is conveniently located just 7.2 mi from Islip’s city center.
Can I find deals for flights from Islip to Washington that include hotel bookings?
Yes. In addition to deals on Islip to Washington flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Islip to Washington?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to Washington.
Can I find deals for business class flights from Islip to Washington?
Yes. Cheapflights offers flight deals from Islip to Washington 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 Islip, New York to State of Washington?
Currently, January is the cheapest month in which you can book a flight from Islip, New York to State of Washington (average of $238). Flying from Islip, New York to State of Washington in June is currently the most expensive (average of $389). 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

Browse thousands of different options on Cheapflights for your next trip

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Complete your trip

State of Washington car rentals

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Top airline flying from Islip to Washington

Airline	Cheapest	Average	Flexibility	On-time
Southwest	Cheapest$356	Average$564	FlexibilityNo cancel fee	On-time63%

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$368+ Cheap flights from Islip, NY (ISP) to Washington

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 8/29. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Islip to Washington with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Islip to Washington

Keep the following information in mind while searching for Islip to Washington flight deals. Data was last updated julio 30, 2025.

Round-trip from

Popular in

Cheapest in

Average price

Find flight deals from Islip to Washington

Cheapest flights from Islip to WashingtonExplore the most affordable flight options available from Islip to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 30, 2025.

Explore the most affordable flight options available from Islip to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 30, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Islip to Washington that are best for you.

Best time to book a flight from Islip to Washington

Have a flexible travel schedule? Discover the best time to fly to Washington from Islip with our price prediction graph.

Cheapflights Insights

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

What is the cheapest month to book a flight from Islip, New York to State of Washington?

Reviews of airlines servicing Washington

Read through reviews of airlines operating flights from Islip to Washington, such as Southwest. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

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

What airport do you fly from for flights from Islip to Washington?

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

How can I find direct flights from Islip to Washington?

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

What is the cheapest month to book a flight from Islip, New York to State of Washington?

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 Islip to Washington

See prices for flight routes from nearby airports that may be better suited for you.

Top airline flying from Islip to Washington

100% Free

Book with Flexibility

Travel Smart

Cheapest flights from Islip to Washington
Explore the most affordable flight options available from Islip to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 30, 2025.