How long is the flight from Islip, New York to Washington, D.C. Reagan-National Airport?

Departing from Islip, New York to Washington, D.C. Reagan-National Airport will take you 6h 20m. The distance between Islip, New York and Washington, D.C. Reagan-National Airport is about 248 mi.

In terms of precipitation, rainfall in Washington, D.C. Reagan-National 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. Reagan-National Airport when rainfall is around 2.6 in.

If weather is an important factor for your trip to Washington, D.C. Reagan-National 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 DCA?

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. Reagan-National Airport as you normally would.

Most accurate provider : When it comes to deals on Islip, New York-Washington, D.C. Reagan-National 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. Reagan-National 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. Reagan-National 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. Reagan-National 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. Reagan-National 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. Reagan-National?

Islip Long Island (ISP) is the airport you will fly out of if you book a flight from Islip to Washington, D.C. Reagan-National. You should not have trouble finding flights to Washington, D.C. Reagan-National from Long Island; the airport handles an average of 0 outbound flights to Washington, D.C. Reagan-National per day. You should also have plenty of airline options to choose from since 0 airlines have flights from the Islip airport to Washington, D.C. Reagan-National. It is only a 7.2 mi journey to Long Island (ISP) from Islip’s city center.

Can I find deals for flights from Islip to Reagan-National that include hotel bookings?

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

How can I find direct flights from Islip to Reagan-National?

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

Can I find deals for business class flights from Islip to Reagan-National?

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

$235+ Cheap Flights from Islip, NY to Washington, D.C. Reagan-National Airport

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Cheap flight deals from Islip to Reagan-National

Cheapest

Best

Last-minute

One-way

Cheapest flights from Islip to Reagan-National
Explore the most affordable flight options available from Islip to Reagan-National. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 9, 2026.

Tue 10/134:20 pm -

1 stop6h 20m

Wed 10/146:00 am -

1 stop7h 10m

Deal found 9/9

$357

Sat 10/35:25 am -

1 stop5h 40m

Mon 10/195:35 pm -

1 stop5h 40m

Deal found 9/4

$377

Tue 10/64:20 pm -

1 stop6h 20m

Tue 10/136:00 am -

2 stops9h 30m

Deal found 9/8

$382

Sat 10/35:25 am -

1 stop5h 40m

Wed 10/76:00 am -

1 stop7h 10m

Deal found 9/8

$397

Sat 10/245:25 am -

1 stop5h 40m

Mon 10/265:35 pm -

1 stop5h 40m

Deal found 9/9

$412

Thu 10/86:55 am -

1 stop9h 00m

Sat 10/1012:00 pm -

1 stop8h 10m

Deal found 9/5

$413

Mon 9/285:00 pm -

1 stop6h 55m

Wed 9/306:00 am -

1 stop8h 55m

Deal found 9/8

$428

Wed 11/45:05 pm -

1 stop5h 50m

Sun 11/84:55 pm -

1 stop5h 50m

Deal found 9/4

$448

Fri 10/26:55 am -

1 stop9h 00m

Fri 10/95:35 pm -

1 stop5h 40m

Deal found 9/4

$453

Best flights from Islip to Reagan-National
Discover carefully curated flight deals from Islip to Reagan-National that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 9, 2026.

Tue 10/134:20 pm -

1 stop6h 20m

Wed 10/146:00 am -

2 stops9h 30m

Deal found 9/9

$362

Mon 11/2312:36 pm -

1 stop8h 23m

Wed 11/2512:10 pm -

1 stop9h 54m

Deal found 9/8

$655

Thu 10/86:55 am -

1 stop9h 00m

Sat 10/1012:00 pm -

1 stop8h 10m

Deal found 9/5

$413

Mon 10/56:55 am -

1 stop9h 00m

Mon 10/55:35 pm -

1 stop5h 40m

Deal found 9/7

$433

Wed 11/45:05 pm -

1 stop5h 50m

Sun 11/84:55 pm -

1 stop5h 50m

Deal found 9/4

$448

Fri 10/26:55 am -

1 stop9h 00m

Fri 10/95:35 pm -

1 stop5h 40m

Deal found 9/4

$453

Thu 10/226:00 am -

1 stop8h 59m

Mon 10/267:08 am -

1 stop6h 30m

Deal found 9/8

$660

Mon 9/215:00 pm -

1 stop6h 55m

Fri 9/2512:55 pm -

1 stop8h 40m

Deal found 9/6

$459

Mon 10/57:00 am -

1 stop7h 58m

Wed 10/147:07 am -

1 stop7h 09m

Deal found 9/6

$663

Last-minute flights from Islip to Reagan-National
Discover last-minute flight deals from Islip to Reagan-National. Data last updated September 9, 2026 and is based on user searches.

Tue 9/2210:20 am -

1 stop5h 45m

Sat 9/266:00 am -

1 stop7h 20m

Deal found 9/7

$459

Mon 9/285:00 pm -

1 stop6h 55m

Wed 9/306:00 am -

1 stop8h 55m

Deal found 9/8

$428

Fri 10/26:55 am -

1 stop9h 00m

Fri 10/95:35 pm -

1 stop5h 40m

Deal found 9/4

$453

Sat 10/35:25 am -

1 stop5h 40m

Mon 10/195:35 pm -

1 stop5h 40m

Deal found 9/4

$377

Sat 10/35:25 am -

1 stop5h 40m

Wed 10/76:00 am -

1 stop7h 10m

Deal found 9/8

$397

Tue 10/64:20 pm -

1 stop6h 20m

Tue 10/136:00 am -

2 stops9h 30m

Deal found 9/8

$382

Thu 10/86:55 am -

1 stop9h 00m

Sat 10/1012:00 pm -

1 stop8h 10m

Deal found 9/5

$413

Tue 10/134:20 pm -

1 stop6h 20m

Wed 10/146:00 am -

1 stop7h 10m

Deal found 9/9

$357

Sat 10/245:25 am -

1 stop5h 40m

Mon 10/265:35 pm -

1 stop5h 40m

Deal found 9/7

$412

One-way flights from Islip to Reagan-National
Search for one-way flight options from Islip to Reagan-National. Find affordable one-way fares based on user searches. Data last updated September 9, 2026.

Fri 9/251:15 pm -

2 stops10h 40m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/8

$235

Fri 10/24:26 pm -

1 stop23h 18m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/6

$277

Fri 10/25:43 pm -

2 stops23h 16m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/6

$296

Fri 9/181:15 pm -

2 stops10h 40m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/7

$329

Fri 9/1811:52 am -

3 stops29h 07m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/7

$344

Fri 10/29:39 am -

3 stops31h 20m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/6

$354

Fri 10/166:55 am -

1 stop9h 00m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/6

$363

Thu 9/247:00 am -

1 stop7h 58m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/8

$390

Fri 9/257:00 am -

1 stop7h 58m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/6

$391

Find flight deals from Islip to Reagan-National

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$357 (Southwest)
One-way from	$235 (Southwest)
Popular in	March
Cheapest in	February
Average price	$278

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

Search Deals

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

Search Deals

From Islip Long Island to Washington, D.C. Reagan-National

Search Deals

One-way flight from Islip Long Island to Washington, D.C. Reagan-National

Search Deals

Highest demand for flights based on searches. 10% potential increase in price ($27 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($7 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. Reagan-National Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

IslipWashington, D.C.

ISP Islip Long Island - DCA Washington, D.C. Reagan-National

ISPDCA

Islip Long Island

Fri 9/25

5:00 pm-11:55 pm

1 stop6h 55m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$249

IslipWashington, D.C.

ISP Islip Long Island - DCA Washington, D.C. Reagan-National

ISPDCA

Islip Long Island

Fri 10/2

4:26 pm-3:44 pm

1 stop23h 18m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$277

IslipWashington, D.C.

ISP Islip Long Island - DCA Washington, D.C. Reagan-National

ISPDCA

Islip Long Island

Fri 10/2

5:43 pm-4:59 pm

2 stops23h 16m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$296

IslipWashington, D.C.

ISP Islip Long Island - DCA Washington, D.C. Reagan-National

ISPDCA

Islip Long Island

Fri 9/18

1:15 pm-11:55 pm

2 stops10h 40m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$329

IslipWashington, D.C.

ISP Islip Long Island - DCA Washington, D.C. Reagan-National

ISPDCA

Islip Long Island

Fri 9/18

11:52 am-4:59 pm

3 stops29h 07m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$344

IslipWashington, D.C.

ISP Islip Long Island - DCA Washington, D.C. Reagan-National

ISPDCA

Islip Long Island

Tue 10/13

4:20 pm-10:40 pm

1 stop6h 20m

Washington, D.C. Reagan-National

Wed 10/14

6:00 am-3:30 pm

2 stops9h 30m

$362

IslipWashington, D.C.

ISP Islip Long Island - DCA Washington, D.C. Reagan-National

ISPDCA

Islip Long Island

Fri 10/16

6:55 am-3:55 pm

1 stop9h 00m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$363

IslipWashington, D.C.

ISP Islip Long Island - DCA Washington, D.C. Reagan-National

ISPDCA

Islip Long Island

Thu 9/24

7:00 am-2:58 pm

1 stop7h 58m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$390

IslipWashington, D.C.

ISP Islip Long Island - DCA Washington, D.C. Reagan-National

ISPDCA

Islip Long Island

Mon 11/23

12:36 pm-8:59 pm

1 stop8h 23m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$392

IslipWashington, D.C.

ISP Islip Long Island - DCA Washington, D.C. Reagan-National

ISPDCA

Islip Long Island

Thu 10/8

6:55 am-3:55 pm

1 stop9h 00m

Washington, D.C. Reagan-National

Sat 10/10

12:00 pm-8:10 pm

1 stop8h 10m

$413

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/8

Showing 1-10 of 19 resultsSorted by cheapest first

Compare providers for flights from Islip to Reagan-National

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Islip to Reagan-National 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. Reagan-National 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. Reagan-National 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. Reagan-National 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. Reagan-National 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. Reagan-National 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 Reagan-National

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

ISP-DCA

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. Reagan-National?
Islip Long Island (ISP) is the airport you will fly out of if you book a flight from Islip to Washington, D.C. Reagan-National. You should not have trouble finding flights to Washington, D.C. Reagan-National from Long Island; the airport handles an average of 0 outbound flights to Washington, D.C. Reagan-National per day. You should also have plenty of airline options to choose from since 0 airlines have flights from the Islip airport to Washington, D.C. Reagan-National. It is only a 7.2 mi journey to Long Island (ISP) from Islip’s city center.
How long is the flight from Islip, New York to Washington, D.C. Reagan-National Airport?
Departing from Islip, New York to Washington, D.C. Reagan-National Airport will take you 6h 20m. The distance between Islip, New York and Washington, D.C. Reagan-National Airport is about 248 mi.
Can I find deals for flights from Islip to Reagan-National that include hotel bookings?
Yes. In addition to deals on Islip to Reagan-National flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Islip to Reagan-National?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to Reagan-National.
Can I find deals for business class flights from Islip to Reagan-National?
Yes. Cheapflights offers flight deals from Islip to Reagan-National 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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$235+ Cheap flights from Islip, NY (ISP) to Reagan-National (DCA)

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 9/25. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheap flight deals from Islip to Reagan-National

Cheapest flights from Islip to Reagan-NationalExplore the most affordable flight options available from Islip to Reagan-National. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 9, 2026.

Explore the most affordable flight options available from Islip to Reagan-National. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 9, 2026.

Best flights from Islip to Reagan-NationalDiscover carefully curated flight deals from Islip to Reagan-National that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 9, 2026.

Discover carefully curated flight deals from Islip to Reagan-National that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 9, 2026.

Last-minute flights from Islip to Reagan-NationalDiscover last-minute flight deals from Islip to Reagan-National. Data last updated September 9, 2026 and is based on user searches.

Discover last-minute flight deals from Islip to Reagan-National. Data last updated September 9, 2026 and is based on user searches.

One-way flights from Islip to Reagan-NationalSearch for one-way flight options from Islip to Reagan-National. Find affordable one-way fares based on user searches. Data last updated September 9, 2026.

Search for one-way flight options from Islip to Reagan-National. Find affordable one-way fares based on user searches. Data last updated September 9, 2026.

Find flight deals from Islip to Reagan-National

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Most trusted provider

Round-trip from

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

Compare providers for flights from Islip to Reagan-National

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 Reagan-National in September.

Best time to book a flight from Islip to Reagan-National

Have a flexible travel schedule? Discover the best time to fly to Reagan-National 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. Reagan-National?

How long is the flight from Islip, New York to Washington, D.C. Reagan-National Airport?

Can I find deals for flights from Islip to Reagan-National that include hotel bookings?

How can I find direct flights from Islip to Reagan-National?

Can I find deals for business class flights from Islip to Reagan-National?

Traveling to a place near Washington, D.C. Reagan-National Airport?

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Islip and Reagan-National flights

Browse other Islip and Reagan-National flight options. Last updated on September 9, 2026.

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Browse through other flights departing from Islip. Flights are based on user searches made on Cheapflights and were last updated on September 9, 2026.

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Cheapest flights from Islip to Reagan-National
Explore the most affordable flight options available from Islip to Reagan-National. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 9, 2026.

Best flights from Islip to Reagan-National
Discover carefully curated flight deals from Islip to Reagan-National that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 9, 2026.

Last-minute flights from Islip to Reagan-National
Discover last-minute flight deals from Islip to Reagan-National. Data last updated September 9, 2026 and is based on user searches.

One-way flights from Islip to Reagan-National
Search for one-way flight options from Islip to Reagan-National. Find affordable one-way fares based on user searches. Data last updated September 9, 2026.