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

There are many flights that can get you from Islip, New York to Washington, D.C. Dulles Intl Airport in 11h 48m. Fly via Frontier or Breeze Airways to get the fastest option. The distance between Islip, New York and Washington, D.C. Dulles Intl Airport is about 263 mi. Both multi-stop and nonstop flights can be found to your destination and back.

In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 2.6 in.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, 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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

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

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 Washington, D.C. Dulles Intl Airport as you normally would.

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

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

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

If you book a flight to Washington, D.C. Dulles Intl from Islip, you will be flying from Long Island, which is the city’s only airport. Islip Long Island (ISP) is located 7.2 mi from the center of Islip. There are 0 flights from Long Island to Washington, D.C. Dulles Intl per day from 0 different airlines.

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

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

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

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

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

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

$100+ Cheap Flights from Islip, NY to Washington, D.C. Dulles Intl Airport

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Cheap flight deals from Islip to Dulles Intl

Cheapest

Best

Last-minute

One-way

Cheapest flights from Islip to Dulles Intl
Explore the most affordable flight options available from Islip to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 4, 2026.

Sat 10/35:43 pm -

1 stop16h 44m

Sat 10/1011:12 am -

1 stop6h 18m

Deal found 9/3

$200

Wed 9/305:43 pm -

1 stop16h 44m

Wed 10/711:12 am -

1 stop5h 46m

Deal found 9/2

$204

Sun 9/276:48 pm -

1 stop18h 15m

Wed 9/3011:12 am -

1 stop5h 46m

Deal found 9/3

$210

Mon 9/215:43 pm -

1 stop16h 34m

Thu 9/2411:12 am -

1 stop5h 46m

Deal found 8/30

$235

Sat 9/265:43 pm -

1 stop16h 44m

Mon 9/2811:12 am -

1 stop5h 46m

Deal found 9/2

$251

Tue 9/225:43 pm -

1 stop16h 34m

Wed 9/233:11 pm -

1 stop26h 52m

Deal found 9/3

$255

Fri 10/166:55 pm -

1 stop15h 22m

Sun 10/1811:12 am -

1 stop6h 18m

Deal found 9/3

$268

Tue 9/810:57 am -

1 stop23h 20m

Tue 9/1511:12 am -

1 stop5h 46m

Deal found 9/1

$270

Thu 10/15:43 pm -

1 stop16h 34m

Thu 10/811:12 am -

1 stop6h 18m

Deal found 8/31

$275

Fri 10/96:55 pm -

1 stop15h 22m

Sun 10/1111:12 am -

1 stop6h 18m

Deal found 9/3

$309

Best flights from Islip to Dulles Intl
Discover carefully curated flight deals from Islip to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 4, 2026.

Wed 9/305:43 pm -

1 stop16h 44m

Wed 10/711:12 am -

1 stop5h 46m

Deal found 9/2

$204

Sun 9/276:48 pm -

1 stop18h 15m

Wed 9/3011:12 am -

1 stop5h 46m

Deal found 9/3

$210

Fri 10/239:33 pm -

1 stop11h 48m

Mon 10/267:53 pm -

1 stop15h 27m

Deal found 8/31

$631

Tue 10/279:59 am -

1 stop11h 29m

Wed 10/2810:19 pm -

1 stop17h 51m

Deal found 9/1

$886

Tue 9/155:43 pm -

1 stop16h 34m

Fri 9/1810:27 am -

1 stop6h 31m

Deal found 9/1

$451

Thu 10/1510:57 am -

2 stops27h 24m

Mon 10/197:53 pm -

1 stop15h 27m

Deal found 8/31

$656

Wed 10/147:25 am -

2 stops8h 58m

Wed 10/1410:15 pm -

1 stop17h 55m

Deal found 9/2

$891

Fri 12/44:33 pm -

2 stops6h 27m

Sun 12/66:00 am -

2 stops9h 21m

Deal found 8/31

$990

Fri 9/185:34 pm -

1 stop13h 46m

Sun 9/208:35 am -

2 stops12h 24m

Deal found 9/4

$1,004

Mon 10/510:05 am -

2 stops12h 54m

Thu 10/88:33 am -

2 stops11h 42m

Deal found 9/1

$1,006

Sat 10/3112:30 pm -

1 stop9h 04m

Sun 11/18:37 am -

2 stops7h 33m

Deal found 9/1

$1,006

Last-minute flights from Islip to Dulles Intl
Discover last-minute flight deals from Islip to Dulles Intl. Data last updated September 4, 2026 and is based on user searches.

Tue 9/810:57 am -

1 stop23h 20m

Tue 9/1511:12 am -

1 stop5h 46m

Deal found 9/1

$270

Mon 9/215:43 pm -

1 stop16h 34m

Thu 9/2411:12 am -

1 stop5h 46m

Deal found 8/30

$235

Tue 9/225:43 pm -

1 stop16h 34m

Wed 9/233:11 pm -

1 stop26h 52m

Deal found 9/3

$255

Sat 9/265:43 pm -

1 stop16h 44m

Mon 9/2811:12 am -

1 stop5h 46m

Deal found 9/2

$251

Sun 9/276:48 pm -

1 stop18h 15m

Wed 9/3011:12 am -

1 stop5h 46m

Deal found 9/3

$210

Wed 9/305:43 pm -

1 stop16h 44m

Wed 10/711:12 am -

1 stop5h 46m

Deal found 9/2

$204

Thu 10/15:43 pm -

1 stop16h 34m

Thu 10/811:12 am -

1 stop6h 18m

Deal found 8/31

$275

Sat 10/35:43 pm -

1 stop16h 44m

Sat 10/1011:12 am -

1 stop6h 18m

Deal found 9/3

$200

Fri 10/96:55 pm -

1 stop15h 22m

Sun 10/1111:12 am -

1 stop6h 18m

Deal found 9/3

$309

Fri 10/166:55 pm -

1 stop15h 22m

Sun 10/1811:12 am -

1 stop6h 18m

Deal found 9/3

$268

One-way flights from Islip to Dulles Intl
Search for one-way flight options from Islip to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated September 4, 2026.

Tue 9/225:43 pm -

1 stop16h 34m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/1

$100

Sat 10/106:25 pm -

1 stop15h 52m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 8/31

$109

Wed 9/235:43 pm -

1 stop16h 44m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/3

$119

Tue 9/155:43 pm -

1 stop16h 34m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/1

$133

Mon 10/55:43 pm -

1 stop16h 34m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/1

$137

Fri 9/186:48 pm -

1 stop23h 45m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/2

$138

Sun 9/135:43 pm -

1 stop16h 34m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/3

$158

Thu 9/105:43 pm -

1 stop16h 34m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/2

$162

Fri 12/49:33 pm -

1 stop11h 48m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 8/31

$173

Mon 9/2811:52 am -

2 stops22h 25m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 8/31

$178

Find flight deals from Islip to Dulles Intl

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$200 (Frontier)
One-way from	$100 (Trip.com)
Popular in	March
Cheapest in	February
Average price	$257

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

Search Deals

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

Search Deals

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

Search Deals

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

Search Deals

Highest demand for flights based on searches. 10% potential increase in price ($28 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($8 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 Islip to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

IslipWashington, D.C.

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

ISPIAD

Islip Long Island

Tue 9/22

5:43 pm-10:17 am

1 stop16h 34m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$100

IslipWashington, D.C.

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

ISPIAD

Islip Long Island

Mon 9/28

11:52 am-10:17 am

2 stops22h 25m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$178

IslipWashington, D.C.

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

ISPIAD

Islip Long Island

Fri 12/4

3:02 pm-2:40 pm

2 stops23h 38m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$186

IslipWashington, D.C.

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

ISPIAD

Islip Long Island

Fri 10/9

6:55 pm-5:13 pm

2 stops22h 18m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$199

IslipWashington, D.C.

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

ISPIAD

Islip Long Island

Wed 9/30

5:43 pm-10:27 am

1 stop16h 44m

Washington, D.C. Dulles Intl

Wed 10/7

11:12 am-4:58 pm

1 stop5h 46m

$204

IslipWashington, D.C.

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

ISPIAD

Islip Long Island

Sun 9/27

6:48 pm-1:03 pm

1 stop18h 15m

Washington, D.C. Dulles Intl

Wed 9/30

11:12 am-4:58 pm

1 stop5h 46m

$210

IslipWashington, D.C.

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

ISPIAD

Islip Long Island

Sat 10/10

6:25 pm-12:21 am

2 stops29h 56m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$231

IslipWashington, D.C.

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

ISPIAD

Islip Long Island

Sun 11/29

4:40 pm-8:40 pm

1 stop28h 00m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$346

IslipWashington, D.C.

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

ISPIAD

Islip Long Island

Sun 11/29

4:40 pm-5:56 pm

2 stops25h 16m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$371

IslipWashington, D.C.

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

ISPIAD

Islip Long Island

Thu 10/1

10:57 am-2:21 pm

2 stops27h 24m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$401

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/1

Showing 1-10 of 23 resultsSorted by cheapest first

Compare providers for flights from Islip to Dulles Intl

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Islip to Dulles Intl 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 Islip, New York-Washington, D.C. Dulles Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Islip, New York-Washington, D.C. Dulles Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Islip, New York-Washington, D.C. Dulles Intl Airport flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Islip, New York-Washington, D.C. Dulles Intl Airport 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 Islip, New York-Washington, D.C. Dulles Intl Airport 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 Islip to Dulles Intl

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

ISP-IAD

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 from for flights from Islip to Washington, D.C. Dulles Intl?
If you book a flight to Washington, D.C. Dulles Intl from Islip, you will be flying from Long Island, which is the city’s only airport. Islip Long Island (ISP) is located 7.2 mi from the center of Islip. There are 0 flights from Long Island to Washington, D.C. Dulles Intl per day from 0 different airlines.
How long is the flight from Islip, New York to Washington, D.C. Dulles Intl Airport?
There are many flights that can get you from Islip, New York to Washington, D.C. Dulles Intl Airport in 11h 48m. Fly via Frontier or Breeze Airways to get the fastest option. The distance between Islip, New York and Washington, D.C. Dulles Intl Airport is about 263 mi. Both multi-stop and nonstop flights can be found to your destination and back.
Can I find deals for flights from Islip to Dulles Intl that include hotel bookings?
Yes. In addition to deals on Islip to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Islip to Dulles Intl?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to Dulles Intl.
Can I find deals for business class flights from Islip to Dulles Intl?
Yes. Cheapflights offers flight deals from Islip to Dulles Intl 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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$100+ Cheap flights from Islip, NY (ISP) to Dulles Intl (IAD)

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 9/22. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Islip to Dulles Intl with Cheapflights

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Cheap flight deals from Islip to Dulles Intl

Cheapest flights from Islip to Dulles IntlExplore the most affordable flight options available from Islip to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 4, 2026.

Explore the most affordable flight options available from Islip to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 4, 2026.

Best flights from Islip to Dulles IntlDiscover carefully curated flight deals from Islip to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 4, 2026.

Discover carefully curated flight deals from Islip to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 4, 2026.

Last-minute flights from Islip to Dulles IntlDiscover last-minute flight deals from Islip to Dulles Intl. Data last updated September 4, 2026 and is based on user searches.

Discover last-minute flight deals from Islip to Dulles Intl. Data last updated September 4, 2026 and is based on user searches.

One-way flights from Islip to Dulles IntlSearch for one-way flight options from Islip to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated September 4, 2026.

Search for one-way flight options from Islip to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated September 4, 2026.

Find flight deals from Islip to Dulles Intl

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Most trusted provider

Round-trip from

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Cheapflights Fare Finder

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

Compare providers for flights from Islip to Dulles Intl

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 Islip to Dulles Intl in September.

Best time to book a flight from Islip to Dulles Intl

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

Related info for your journey

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

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

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

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

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

Traveling to a place near Washington, D.C. Dulles Intl Airport?

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

Complete your trip

Complete your trip to Dulles Intl by adding a car rental and/or hotel reservation to your travel itinerary.

Other flights to Dulles Intl

Explore flights to Dulles Intl departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 4, 2026.

Search flights from Islip to Dulles Intl by cabin class

Find flights from Islip to Dulles Intl, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Islip and Dulles Intl flights

Browse other Islip and Dulles Intl flight options. Last updated on September 4, 2026.

Other flights from Islip

Browse through other flights departing from Islip. Flights are based on user searches made on Cheapflights and were last updated on September 4, 2026.

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Cheapest flights from Islip to Dulles Intl
Explore the most affordable flight options available from Islip to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 4, 2026.

Best flights from Islip to Dulles Intl
Discover carefully curated flight deals from Islip to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 4, 2026.

Last-minute flights from Islip to Dulles Intl
Discover last-minute flight deals from Islip to Dulles Intl. Data last updated September 4, 2026 and is based on user searches.

One-way flights from Islip to Dulles Intl
Search for one-way flight options from Islip to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated September 4, 2026.