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 18h 10m. 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.

$120+ 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 October 25, 2026.

Fri 12/43:10 pm -

2 stops18h 19m

Sun 12/66:10 pm -

2 stops23h 28m

Deal found 10/20

$319

Fri 11/67:53 pm -

1 stop18h 52m

Tue 11/1012:00 pm -

2 stops11h 43m

Deal found 10/22

$332

Fri 11/67:53 pm -

1 stop18h 52m

Mon 11/93:02 pm -

2 stops19h 19m

Deal found 10/23

$344

Fri 11/209:35 pm -

1 stop18h 10m

Sun 11/224:40 pm -

1 stop28h 00m

Deal found 10/25

$355

Fri 11/67:53 pm -

1 stop18h 52m

Tue 11/1010:25 am -

1 stop22h 56m

Deal found 10/22

$391

Sat 10/2411:12 am -

1 stop6h 18m

Mon 10/266:55 pm -

1 stop15h 26m

Deal found 10/22

$450

Sat 10/2411:12 am -

1 stop6h 18m

Sun 10/256:25 pm -

1 stop15h 52m

Deal found 10/21

$451

Fri 11/67:53 pm -

1 stop18h 52m

Sun 11/86:33 pm -

1 stop15h 48m

Deal found 10/23

$492

Thu 11/1910:39 am -

1 stop7h 30m

Thu 11/2610:57 am -

2 stops25h 17m

Deal found 10/20

$532

Fri 11/137:53 pm -

1 stop18h 52m

Sun 11/1510:57 am -

2 stops12h 46m

Deal found 10/21

$551

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 October 25, 2026.

Fri 12/43:10 pm -

2 stops18h 19m

Sun 12/66:10 pm -

3 stops39h 57m

Deal found 10/20

$355

Fri 11/139:06 pm -

2 stops20h 25m

Sun 11/156:33 pm -

2 stops29h 10m

Deal found 10/21

$632

Sat 1/301:49 pm -

1 stop6h 10m

Sun 1/3110:57 am -

2 stops27h 59m

Deal found 10/22

$710

Fri 11/67:53 pm -

1 stop18h 52m

Sun 11/86:33 pm -

1 stop15h 48m

Deal found 10/23

$492

Thu 11/1910:39 am -

1 stop7h 30m

Thu 11/2610:57 am -

2 stops25h 17m

Deal found 10/20

$532

Tue 12/2210:06 pm -

1 stop12h 25m

Fri 12/2511:26 am -

1 stop9h 39m

Deal found 10/21

$772

Fri 11/137:53 pm -

1 stop18h 52m

Sun 11/157:45 pm -

3 stops22h 11m

Deal found 10/24

$839

Fri 11/207:53 pm -

1 stop18h 52m

Sun 11/2210:57 am -

2 stops27h 24m

Deal found 10/25

$855

Tue 11/249:35 pm -

1 stop18h 10m

Sun 11/294:40 pm -

1 stop28h 00m

Deal found 10/23

$869

Sun 12/2010:06 pm -

1 stop12h 25m

Tue 12/296:49 pm -

1 stop23h 43m

Deal found 10/21

$823

Last-minute flights from Dulles Intl to Islip
Discover last-minute flight deals from Dulles Intl to Islip. Data last updated October 25, 2026 and is based on user searches.

Sat 10/2411:12 am -

1 stop6h 18m

Mon 10/266:55 pm -

1 stop15h 26m

Deal found 10/22

$450

Sat 10/2411:12 am -

1 stop6h 18m

Sun 10/256:25 pm -

1 stop15h 52m

Deal found 10/21

$451

Fri 10/307:53 pm -

1 stop18h 52m

Mon 11/211:13 am -

2 stops8h 58m

Deal found 10/22

$580

Fri 11/67:53 pm -

1 stop18h 52m

Tue 11/1012:00 pm -

2 stops11h 43m

Deal found 10/22

$332

Fri 11/67:53 pm -

1 stop18h 52m

Mon 11/93:02 pm -

2 stops19h 19m

Deal found 10/23

$344

Fri 11/67:53 pm -

1 stop18h 52m

Tue 11/1010:25 am -

1 stop22h 56m

Deal found 10/22

$391

Fri 11/67:53 pm -

1 stop18h 52m

Sun 11/86:33 pm -

1 stop15h 48m

Deal found 10/23

$492

Fri 11/137:53 pm -

1 stop18h 52m

Sun 11/1510:57 am -

2 stops12h 46m

Deal found 10/21

$551

Thu 11/1910:39 am -

1 stop7h 30m

Thu 11/2610:57 am -

2 stops25h 17m

Deal found 10/20

$532

Fri 11/209:35 pm -

1 stop18h 10m

Sun 11/224:40 pm -

1 stop28h 00m

Deal found 10/25

$355

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 October 25, 2026.

Sat 11/711:16 am -

1 stop6h 15m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/21

$120

Tue 12/2910:06 pm -

1 stop12h 25m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/23

$155

Thu 11/1211:16 am -

1 stop6h 15m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/23

$180

Thu 11/127:32 am -

2 stops30h 50m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/23

$192

Sun 12/2710:06 pm -

1 stop12h 25m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/23

$205

Fri 10/3011:16 am -

1 stop6h 40m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/24

$215

Fri 11/209:35 pm -

1 stop18h 10m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/24

$221

Thu 11/197:32 am -

2 stops30h 50m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/23

$232

Fri 11/69:06 pm -

2 stops20h 25m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/21

$275

Fri 11/2010:47 pm -

2 stops35h 30m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/24

$291

Find flight deals from Dulles Intl to Islip

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$319 (Mytrip)
One-way from	$120 (Travelocity)
Popular in	October
Cheapest in	December
Average price	$374

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. 16% potential increase in price ($50 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease ($12 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in October 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

Sat 11/7

11:16 am-5:31 pm

1 stop6h 15m

Islip Long Island

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$120

Washington, D.C.Islip

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

IADISP

Washington, D.C. Dulles Intl

Tue 12/29

10:06 pm-10:31 am

1 stop12h 25m

Islip Long Island

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$155

Washington, D.C.Islip

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

IADISP

Washington, D.C. Dulles Intl

Thu 11/12

11:16 am-5:31 pm

1 stop6h 15m

Islip Long Island

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$180

Washington, D.C.Islip

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

IADISP

Washington, D.C. Dulles Intl

Thu 11/12

7:32 am-2:22 pm

2 stops30h 50m

Islip Long Island

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$192

Washington, D.C.Islip

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

IADISP

Washington, D.C. Dulles Intl

Sun 12/27

10:06 pm-10:31 am

1 stop12h 25m

Islip Long Island

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$205

Washington, D.C.Islip

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

IADISP

Washington, D.C. Dulles Intl

Fri 10/30

11:16 am-5:56 pm

1 stop6h 40m

Islip Long Island

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$215

Washington, D.C.Islip

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

IADISP

Washington, D.C. Dulles Intl

Fri 11/6

9:06 pm-5:31 pm

2 stops20h 25m

Islip Long Island

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$275

Washington, D.C.Islip

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

IADISP

Washington, D.C. Dulles Intl

Fri 11/20

10:47 pm-10:17 am

2 stops35h 30m

Islip Long Island

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$291

Washington, D.C.Islip

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

IADISP

Washington, D.C. Dulles Intl

Fri 11/6

7:53 pm-2:45 pm

1 stop18h 52m

Islip Long Island

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$336

Washington, D.C.Islip

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

IADISP

Washington, D.C. Dulles Intl

Fri 12/4

3:10 pm-9:29 am

2 stops18h 19m

Islip Long Island

Sun 12/6

6:10 pm-10:07 am

3 stops39h 57m

$355

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/21

Showing 1-10 of 21 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 October.

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 18h 10m. 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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$120+ 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 11/7. 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 October 25, 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 October 25, 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 October 25, 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 October 25, 2026.

Last-minute flights from Dulles Intl to IslipDiscover last-minute flight deals from Dulles Intl to Islip. Data last updated October 25, 2026 and is based on user searches.

Discover last-minute flight deals from Dulles Intl to Islip. Data last updated October 25, 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 October 25, 2026.

Search for one-way flight options from Dulles Intl to Islip. Find affordable one-way fares based on user searches. Data last updated October 25, 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 October.

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 October 25, 2026.

Dulles Intl and Islip flights

Browse other Dulles Intl and Islip flight options. Last updated on October 25, 2026.

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Browse through other flights departing from Dulles Intl. Flights are based on user searches made on Cheapflights and were last updated on October 25, 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 October 25, 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 October 25, 2026.

Last-minute flights from Dulles Intl to Islip
Discover last-minute flight deals from Dulles Intl to Islip. Data last updated October 25, 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 October 25, 2026.