How long is the flight from Washington, D.C. Dulles Intl Airport to Islip, New York?

There are many flights that can get you from Washington, D.C. Dulles Intl Airport to Islip, New York in 5h 46m. Fly via Frontier to get the fastest option. Airlines will cover a distance of 263 mi.

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.

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).

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

When flying from Washington, D.C. Dulles Intl Airport 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.

Most accurate provider : When it comes to deals on Washington, D.C. Dulles Intl Airport-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 Washington, D.C. Dulles Intl Airport-Islip, New York flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-Islip, New York flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Washington, D.C. Dulles Intl Airport-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 Washington, D.C. Dulles Intl Airport-Islip, New York flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

What airport do you fly into for flights to Islip from Washington, D.C. Dulles Intl?

Located just 7.2 mi from the city center, Islip Long Island is the airport most travelers will use when flying to Islip from Washington, D.C. Dulles Intl. Booking flights from Washington, D.C. Dulles Intl to Long Island (ISP) should be relatively easy as there are 0 daily inbound flights from Washington, D.C. Dulles Intl from 0 different airlines.

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

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

How can I find direct flights from Dulles Intl to Islip?

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

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

Yes. Cheapflights offers flight deals from Dulles Intl 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.

$90+ Cheap Flights from Washington, D.C. Dulles Intl Airport to Islip, NY

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Cheap flight deals from Dulles Intl to Islip

Cheapest

Best

Last-minute

One-way

Cheapest flights from Dulles Intl to Islip
Explore the most affordable flight options available from Dulles Intl to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 7, 2026.

Tue 10/611:12 am -

1 stop5h 46m

Wed 10/75:43 pm -

1 stop16h 34m

Deal found 9/2

$210

Sat 9/2611:12 am -

1 stop5h 46m

Sun 9/276:48 pm -

1 stop18h 15m

Deal found 9/3

$230

Sat 10/39:33 am -

1 stop7h 25m

Sun 10/45:43 pm -

1 stop16h 34m

Deal found 9/6

$240

Fri 10/211:12 am -

1 stop5h 46m

Mon 10/55:43 pm -

1 stop16h 34m

Deal found 9/5

$269

Thu 9/1711:12 am -

1 stop5h 46m

Mon 9/215:43 pm -

1 stop16h 34m

Deal found 9/2

$270

Sat 9/1911:12 am -

1 stop5h 46m

Sun 9/206:48 pm -

1 stop18h 05m

Deal found 9/7

$290

Sun 9/2011:12 am -

1 stop5h 46m

Sun 9/276:48 pm -

1 stop18h 15m

Deal found 9/2

$305

Sat 9/1211:12 am -

1 stop5h 46m

Sun 9/136:48 pm -

1 stop18h 15m

Deal found 9/4

$310

Thu 9/1011:12 am -

1 stop5h 46m

Mon 9/145:43 pm -

1 stop16h 34m

Deal found 9/4

$320

Fri 9/1810:27 am -

1 stop6h 31m

Mon 9/215:43 pm -

1 stop16h 34m

Deal found 9/3

$325

Fri 9/49:54 pm -

1 stop20h 20m

Fri 9/116:48 pm -

1 stop23h 45m

Deal found 9/3

$331

Thu 9/1011:12 am -

1 stop5h 46m

Sat 9/125:43 pm -

1 stop16h 44m

Deal found 9/6

$336

Best flights from Dulles Intl to Islip
Discover carefully curated flight deals from Dulles Intl to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 7, 2026.

Fri 10/211:12 am -

1 stop5h 46m

Mon 10/55:43 pm -

1 stop16h 34m

Deal found 9/5

$269

Wed 10/281:49 pm -

2 stops20h 28m

Mon 11/26:54 pm -

1 stop15h 27m

Deal found 9/6

$413

Thu 9/1711:12 am -

1 stop5h 46m

Sun 9/206:48 pm -

1 stop18h 05m

Deal found 9/3

$270

Thu 9/1711:12 am -

1 stop5h 46m

Mon 9/215:43 pm -

1 stop16h 34m

Deal found 9/2

$270

Fri 9/2511:12 am -

1 stop5h 46m

Sun 9/276:48 pm -

1 stop18h 15m

Deal found 9/3

$305

Fri 10/21:40 pm -

2 stops21h 40m

Mon 10/55:43 pm -

1 stop16h 34m

Deal found 9/5

$426

Sun 10/49:04 pm -

2 stops38h 16m

Sun 10/116:25 pm -

1 stop15h 52m

Deal found 9/4

$462

Thu 10/2211:12 am -

1 stop6h 18m

Sun 10/256:25 pm -

2 stops22h 48m

Deal found 9/3

$399

Fri 9/1810:27 am -

1 stop6h 31m

Mon 9/215:43 pm -

1 stop16h 34m

Deal found 9/6

$410

Thu 9/176:13 pm -

2 stops16h 15m

Sun 9/205:43 pm -

1 stop15h 49m

Deal found 9/3

$595

Fri 9/1810:27 am -

1 stop6h 31m

Sun 9/205:43 pm -

2 stops24h 13m

Deal found 9/7

$616

Last-minute flights from Dulles Intl to Islip
Discover last-minute flight deals from Dulles Intl to Islip. Data last updated September 7, 2026 and is based on user searches.

Fri 9/49:54 pm -

1 stop20h 20m

Fri 9/116:48 pm -

1 stop23h 45m

Deal found 9/3

$331

Thu 9/1011:12 am -

1 stop5h 46m

Mon 9/145:43 pm -

1 stop16h 34m

Deal found 9/4

$320

Thu 9/1011:12 am -

1 stop5h 46m

Sat 9/125:43 pm -

1 stop16h 44m

Deal found 9/6

$336

Sat 9/1211:12 am -

1 stop5h 46m

Sun 9/136:48 pm -

1 stop18h 15m

Deal found 9/4

$310

Thu 9/1711:12 am -

1 stop5h 46m

Mon 9/215:43 pm -

1 stop16h 34m

Deal found 9/2

$270

Fri 9/1810:27 am -

1 stop6h 31m

Mon 9/215:43 pm -

1 stop16h 34m

Deal found 9/3

$325

Sat 9/1911:12 am -

1 stop5h 46m

Sun 9/206:48 pm -

1 stop18h 05m

Deal found 9/7

$290

Sun 9/2011:12 am -

1 stop5h 46m

Sun 9/276:48 pm -

1 stop18h 15m

Deal found 9/2

$305

Sat 9/2611:12 am -

1 stop5h 46m

Sun 9/276:48 pm -

1 stop18h 15m

Deal found 9/3

$230

Fri 10/211:12 am -

1 stop5h 46m

Mon 10/55:43 pm -

1 stop16h 34m

Deal found 9/5

$269

Sat 10/39:33 am -

1 stop7h 25m

Sun 10/45:43 pm -

1 stop16h 34m

Deal found 9/6

$240

Tue 10/611:12 am -

1 stop5h 46m

Wed 10/75:43 pm -

1 stop16h 34m

Deal found 9/2

$210

One-way flights from Dulles Intl to Islip
Search for one-way flight options from Dulles Intl to Islip. Find affordable one-way fares based on user searches. Data last updated September 7, 2026.

Wed 9/3011:12 am -

1 stop5h 46m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/2

$90

Sat 10/39:33 am -

1 stop7h 25m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/3

$100

Sat 10/1011:12 am -

1 stop6h 18m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/3

$102

Fri 10/211:12 am -

1 stop5h 46m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/2

$129

Mon 11/239:35 pm -

1 stop18h 10m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/3

$135

Sun 9/1311:12 am -

1 stop5h 46m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/2

$150

Mon 9/216:36 pm -

3 stops18h 22m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/7

$158

Thu 10/19:04 pm -

2 stops38h 16m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/3

$160

Mon 9/216:36 pm -

2 stops22h 22m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/7

$166

Thu 10/111:12 am -

1 stop29h 46m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/3

$172

Find flight deals from Dulles Intl to Islip

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$210 (Trip.com)
One-way from	$90 (Frontier)
Popular in	August
Cheapest in	November
Average price	$254

Provider with most accurate pricing for Washington, D.C. Dulles Intl-Islip Long Island flight deals.

Search Deals

Provider most trusted by Cheapflights users for Washington, D.C. Dulles Intl-Islip Long Island flights.

Search Deals

From Washington, D.C. Dulles Intl to Islip Long Island

Search Deals

One-way flight from Washington, D.C. Dulles Intl to Islip Long Island

Search Deals

Highest demand for flights based on searches. 11% potential increase in price ($30 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in September 2026

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Islip that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

Washington, D.C.Islip

IAD Washington, D.C. Dulles Intl - ISP Islip Long Island

IADISP

Washington, D.C. Dulles Intl

Wed 9/30

11:12 am-4:58 pm

1 stop5h 46m

Islip Long Island

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$90

Washington, D.C.Islip

IAD Washington, D.C. Dulles Intl - ISP Islip Long Island

IADISP

Washington, D.C. Dulles Intl

Fri 10/2

11:12 am-4:58 pm

1 stop5h 46m

Islip Long Island

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$129

Washington, D.C.Islip

IAD Washington, D.C. Dulles Intl - ISP Islip Long Island

IADISP

Washington, D.C. Dulles Intl

Thu 9/24

11:12 am-4:58 pm

1 stop5h 46m

Islip Long Island

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$130

Washington, D.C.Islip

IAD Washington, D.C. Dulles Intl - ISP Islip Long Island

IADISP

Washington, D.C. Dulles Intl

Mon 9/21

6:36 pm-12:58 pm

3 stops18h 22m

Islip Long Island

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$158

Washington, D.C.Islip

IAD Washington, D.C. Dulles Intl - ISP Islip Long Island

IADISP

Washington, D.C. Dulles Intl

Fri 9/25

11:12 am-4:58 pm

1 stop5h 46m

Islip Long Island

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$185

Washington, D.C.Islip

IAD Washington, D.C. Dulles Intl - ISP Islip Long Island

IADISP

Washington, D.C. Dulles Intl

Thu 10/1

9:04 pm-4:58 pm

2 stops19h 54m

Islip Long Island

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$196

Washington, D.C.Islip

IAD Washington, D.C. Dulles Intl - ISP Islip Long Island

IADISP

Washington, D.C. Dulles Intl

Fri 10/2

6:36 pm-4:58 pm

2 stops22h 22m

Islip Long Island

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$198

Washington, D.C.Islip

IAD Washington, D.C. Dulles Intl - ISP Islip Long Island

IADISP

Washington, D.C. Dulles Intl

Fri 10/2

6:36 pm-11:20 am

3 stops16h 44m

Islip Long Island

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$202

Washington, D.C.Islip

IAD Washington, D.C. Dulles Intl - ISP Islip Long Island

IADISP

Washington, D.C. Dulles Intl

Fri 10/2

11:12 am-4:58 pm

1 stop5h 46m

Islip Long Island

Mon 10/5

5:43 pm-10:17 am

1 stop16h 34m

$269

Washington, D.C.Islip

IAD Washington, D.C. Dulles Intl - ISP Islip Long Island

IADISP

Washington, D.C. Dulles Intl

Thu 9/17

11:12 am-4:58 pm

1 stop5h 46m

Islip Long Island

Sun 9/20

6:48 pm-12:53 pm

1 stop18h 05m

$270

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/2

Showing 1-10 of 19 resultsSorted by cheapest first

Compare providers for flights from Dulles Intl to Islip

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Dulles Intl to Islip in September.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust 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 Washington, D.C. Dulles Intl Airport-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 Washington, D.C. Dulles Intl Airport-Islip, New York flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-Islip, New York flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-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 Washington, D.C. Dulles Intl Airport-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 Dulles Intl to Islip

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

IAD-ISP

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.

Related info for your journey

What airport do you fly into for flights to Islip from Washington, D.C. Dulles Intl?
Located just 7.2 mi from the city center, Islip Long Island is the airport most travelers will use when flying to Islip from Washington, D.C. Dulles Intl. Booking flights from Washington, D.C. Dulles Intl to Long Island (ISP) should be relatively easy as there are 0 daily inbound flights from Washington, D.C. Dulles Intl from 0 different airlines.
How long is the flight from Washington, D.C. Dulles Intl Airport to Islip, New York?
There are many flights that can get you from Washington, D.C. Dulles Intl Airport to Islip, New York in 5h 46m. Fly via Frontier to get the fastest option. Airlines will cover a distance of 263 mi.
Can I find deals for flights from Dulles Intl to Islip that include hotel bookings?
Yes. In addition to deals on Dulles Intl to Islip flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Dulles Intl to Islip?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to Islip.
Can I find deals for business class flights from Dulles Intl to Islip?
Yes. Cheapflights offers flight deals from Dulles Intl 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.

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$90+ Cheap flights from Dulles Intl (IAD) to Islip, NY (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 9/30. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Dulles Intl to Islip with Cheapflights

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Cheap flight deals from Dulles Intl to Islip

Cheapest flights from Dulles Intl to IslipExplore the most affordable flight options available from Dulles Intl to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 7, 2026.

Explore the most affordable flight options available from Dulles Intl to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 7, 2026.

Best flights from Dulles Intl to IslipDiscover carefully curated flight deals from Dulles Intl to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 7, 2026.

Discover carefully curated flight deals from Dulles Intl to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 7, 2026.

Last-minute flights from Dulles Intl to IslipDiscover last-minute flight deals from Dulles Intl to Islip. Data last updated September 7, 2026 and is based on user searches.

Discover last-minute flight deals from Dulles Intl to Islip. Data last updated September 7, 2026 and is based on user searches.

One-way flights from Dulles Intl to IslipSearch for one-way flight options from Dulles Intl to Islip. Find affordable one-way fares based on user searches. Data last updated September 7, 2026.

Search for one-way flight options from Dulles Intl to Islip. Find affordable one-way fares based on user searches. Data last updated September 7, 2026.

Find flight deals from Dulles Intl to Islip

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Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Islip that are best for you.

Compare providers for flights from Dulles Intl 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 Dulles Intl to Islip in September.

Best time to book a flight from Dulles Intl to Islip

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

Related info for your journey

What airport do you fly into for flights to Islip from Washington, D.C. Dulles Intl?

How long is the flight from Washington, D.C. Dulles Intl Airport to Islip, New York?

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

How can I find direct flights from Dulles Intl to Islip?

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

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Alternative routes for Dulles Intl to Islip

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Complete your trip

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Search flights from Dulles Intl to Islip by cabin class

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Other flights to Islip

Explore flights to Islip departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 7, 2026.

Dulles Intl and Islip flights

Browse other Dulles Intl and Islip flight options. Last updated on September 7, 2026.

Other flights from Dulles Intl

Browse through other flights departing from Dulles Intl. Flights are based on user searches made on Cheapflights and were last updated on September 7, 2026.

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Cheapest flights from Dulles Intl to Islip
Explore the most affordable flight options available from Dulles Intl to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 7, 2026.

Best flights from Dulles Intl to Islip
Discover carefully curated flight deals from Dulles Intl to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 7, 2026.

Last-minute flights from Dulles Intl to Islip
Discover last-minute flight deals from Dulles Intl to Islip. Data last updated September 7, 2026 and is based on user searches.

One-way flights from Dulles Intl to Islip
Search for one-way flight options from Dulles Intl to Islip. Find affordable one-way fares based on user searches. Data last updated September 7, 2026.