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

A quick flight from Islip to Washington, D.C. Reagan-National Airport can take about 6h 31m. Southwest provides one of the quickest options available for as low as $381. There are 248 mi between Islip and Washington, D.C. Reagan-National Airport. This flight may include one or multiple stops.

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).

How far in advance should I book a flight from Islip to Washington, D.C. Reagan-National Airport?

Users have found that booking a flight from Islip to Washington, D.C. Reagan-National Airport at least 27 days early can save you up to 185% on average compared to booking a flight this week. If booking 27 days before your flight isn’t an option for you, users have found flights from Islip to Washington, D.C. Reagan-National Airport for as little as $279 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $447 for flights departing within the next 3 days.

What is the cheapest month to fly from Islip to Washington, D.C. Reagan-National Airport?

April is one of the best times of the year to fly to Washington, D.C. Reagan-National Airport from Islip. Prices for April average $228 per person but you can even find prices for as low as $91. The most expensive prices can be found in the month of December. Opting for a April flight can save you 30% on your journey compared to booking in December

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.

$113+ Flights from Islip to Washington, D.C. Reagan-National Airport

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

Find cheap flights from Islip to Reagan-National with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Islip to Reagan-National

Round-trip from	$277 (Southwest)
One-way from	$113 (Trip.com)
Popular in	December
Cheapest in	April
Average price	$192

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. 19% potential increase in price ($53 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 2025

Search Deals

Find flight deals from Islip to Reagan-National

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 11, 2025.

Wed 10/221:10 pmISP - DCA

1 stop9h 45mSouthwest

Sat 10/252:30 pmDCA - ISP

1 stop5h 40mSouthwest

Deal found 9/11

$277

Tue 10/281:10 pmISP - DCA

1 stop9h 45mSouthwest

Thu 10/306:55 amDCA - ISP

1 stop7h 40mSouthwest

Deal found 9/9

$332

Fri 10/311:35 amISP - DCA

1 stop6h 31mJetBlue

Sun 10/53:00 pmDCA - ISP

1 stop24h 20mJetBlue

Deal found 9/9

$381

Fri 10/33:20 pmISP - DCA

1 stop7h 35mSouthwest

Mon 10/66:55 amDCA - ISP

1 stop7h 40mSouthwest

Deal found 9/10

$428

Mon 9/296:25 amISP - DCA

1 stop9h 45mSouthwest

Tue 9/3012:50 pmDCA - ISP

1 stop8h 15mSouthwest

Deal found 9/10

$431

Thu 10/95:55 amISP - DCA

1 stop10h 00mSouthwest

Thu 10/166:55 amDCA - ISP

1 stop7h 40mSouthwest

Deal found 9/10

$434

Fri 10/103:20 pmISP - DCA

1 stop7h 35mSouthwest

Fri 10/1711:50 amDCA - ISP

1 stop10h 20mSouthwest

Deal found 9/10

$444

Mon 10/63:20 pmISP - DCA

1 stop7h 35mSouthwest

Wed 10/87:25 amDCA - ISP

2 stops8h 55mSouthwest

Deal found 9/11

$472

Thu 9/256:25 amISP - DCA

1 stop9h 45mSouthwest

Sat 9/276:55 amDCA - ISP

2 stops8h 10mSouthwest

Deal found 9/11

$499

Thu 9/186:25 amISP - DCA

1 stop9h 45mSouthwest

Sun 9/216:05 amDCA - ISP

1 stop7h 50mSouthwest

Deal found 9/11

$575

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 11, 2025.

Wed 10/221:10 pmISP - DCA

1 stop9h 45mSouthwest

Sat 10/252:30 pmDCA - ISP

1 stop5h 40mSouthwest

Deal found 9/11

$277

Fri 10/311:35 amISP - DCA

1 stop6h 31mJetBlue

Sun 10/53:00 pmDCA - ISP

1 stop24h 20mJetBlue

Deal found 9/9

$381

Tue 10/281:10 pmISP - DCA

1 stop9h 45mSouthwest

Thu 10/306:55 amDCA - ISP

1 stop7h 40mSouthwest

Deal found 9/9

$332

Fri 10/33:20 pmISP - DCA

1 stop7h 35mSouthwest

Mon 10/66:55 amDCA - ISP

1 stop7h 40mSouthwest

Deal found 9/10

$428

Mon 9/296:25 amISP - DCA

1 stop9h 45mSouthwest

Tue 9/3012:50 pmDCA - ISP

1 stop8h 15mSouthwest

Deal found 9/10

$431

Thu 10/95:55 amISP - DCA

1 stop10h 00mSouthwest

Thu 10/166:55 amDCA - ISP

1 stop7h 40mSouthwest

Deal found 9/10

$434

Fri 10/103:20 pmISP - DCA

1 stop7h 35mSouthwest

Fri 10/1711:50 amDCA - ISP

1 stop10h 20mSouthwest

Deal found 9/10

$444

Mon 10/63:20 pmISP - DCA

1 stop7h 35mSouthwest

Wed 10/86:55 amDCA - ISP

1 stop9h 25mSouthwest

Deal found 9/11

$472

Sun 10/1212:55 pmISP - DCA

1 stop10h 00mSouthwest

Thu 10/166:55 amDCA - ISP

1 stop7h 40mSouthwest

Deal found 9/11

$472

Thu 9/256:25 amISP - DCA

1 stop9h 45mSouthwest

Sat 9/278:00 amDCA - ISP

1 stop8h 10mSouthwest

Deal found 9/11

$472

Last-minute flights from Islip to Reagan-National
Discover last-minute flight deals from Islip to Reagan-National. Data last updated September 11, 2025 and is based on user searches.

Thu 9/186:25 amISP - DCA

1 stop9h 45mSouthwest

Sun 9/216:05 amDCA - ISP

1 stop7h 50mSouthwest

Deal found 9/11

$575

Thu 9/256:25 amISP - DCA

1 stop9h 45mSouthwest

Sat 9/276:55 amDCA - ISP

2 stops8h 10mSouthwest

Deal found 9/11

$499

Mon 9/296:25 amISP - DCA

1 stop9h 45mSouthwest

Tue 9/3012:50 pmDCA - ISP

1 stop8h 15mSouthwest

Deal found 9/10

$431

Fri 10/311:35 amISP - DCA

1 stop6h 31mJetBlue

Sun 10/53:00 pmDCA - ISP

1 stop24h 20mJetBlue

Deal found 9/9

$381

Fri 10/33:20 pmISP - DCA

1 stop7h 35mSouthwest

Mon 10/66:55 amDCA - ISP

1 stop7h 40mSouthwest

Deal found 9/10

$428

Mon 10/63:20 pmISP - DCA

1 stop7h 35mSouthwest

Wed 10/87:25 amDCA - ISP

2 stops8h 55mSouthwest

Deal found 9/11

$472

Thu 10/95:55 amISP - DCA

1 stop10h 00mSouthwest

Thu 10/166:55 amDCA - ISP

1 stop7h 40mSouthwest

Deal found 9/10

$434

Fri 10/103:20 pmISP - DCA

1 stop7h 35mSouthwest

Fri 10/1711:50 amDCA - ISP

1 stop10h 20mSouthwest

Deal found 9/10

$444

Wed 10/221:10 pmISP - DCA

1 stop9h 45mSouthwest

Sat 10/252:30 pmDCA - ISP

1 stop5h 40mSouthwest

Deal found 9/11

$277

Tue 10/281:10 pmISP - DCA

1 stop9h 45mSouthwest

Thu 10/306:55 amDCA - ISP

1 stop7h 40mSouthwest

Deal found 9/9

$332

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 11, 2025.

Wed 11/121:57 pmISP - DCA

1 stop8h 18mJetBlue

Deal found 9/10

$113

Mon 12/1512:15 pmISP - DCA

1 stop10h 14mJetBlue

Deal found 9/11

$118

Sun 11/236:26 pmISP - DCA

1 stop16h 34mJetBlue

Deal found 9/11

$150

Fri 12/512:15 pmISP - DCA

1 stop6h 40mJetBlue

Deal found 9/11

$154

Thu 10/301:57 pmISP - DCA

1 stop8h 32mJetBlue

Deal found 9/10

$155

Wed 12/1710:45 amISP - DCA

1 stop26h 18mJetBlue

Deal found 9/11

$158

Wed 11/191:57 pmISP - DCA

1 stop8h 18mJetBlue

Deal found 9/10

$159

Tue 12/1612:15 pmISP - DCA

1 stop6h 40mJetBlue

Deal found 9/10

$162

Wed 12/1012:15 pmISP - DCA

1 stop10h 14mJetBlue

Deal found 9/10

$163

Thu 12/1112:15 pmISP - DCA

1 stop10h 14mJetBlue

Deal found 9/10

$170

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

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 10/22

1:10 pm-10:55 pm

1 stop9h 45m

Washington, D.C. Reagan-National

Sat 10/25

2:30 pm-8:10 pm

1 stop5h 40m

$277

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Tue 10/28

1:10 pm-10:55 pm

1 stop9h 45m

Washington, D.C. Reagan-National

Thu 10/30

6:55 am-2:35 pm

1 stop7h 40m

$332

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 10/3

11:35 am-6:06 pm

1 stop6h 31m

Washington, D.C. Reagan-National

Sun 10/5

3:00 pm-3:20 pm

1 stop24h 20m

$381

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 10/3

3:20 pm-10:55 pm

1 stop7h 35m

Washington, D.C. Reagan-National

Mon 10/6

6:55 am-2:35 pm

1 stop7h 40m

$428

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Mon 9/29

6:25 am-4:10 pm

1 stop9h 45m

Washington, D.C. Reagan-National

Tue 9/30

12:50 pm-9:05 pm

1 stop8h 15m

$431

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Thu 10/9

5:55 am-3:55 pm

1 stop10h 00m

Washington, D.C. Reagan-National

Thu 10/16

6:55 am-2:35 pm

1 stop7h 40m

$434

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 10/10

3:20 pm-10:55 pm

1 stop7h 35m

Washington, D.C. Reagan-National

Fri 10/17

11:50 am-10:10 pm

1 stop10h 20m

$444

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Mon 10/6

3:20 pm-10:55 pm

1 stop7h 35m

Washington, D.C. Reagan-National

Wed 10/8

6:55 am-4:20 pm

1 stop9h 25m

$472

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sun 10/12

12:55 pm-10:55 pm

1 stop10h 00m

Washington, D.C. Reagan-National

Thu 10/16

6:55 am-2:35 pm

1 stop7h 40m

$472

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Thu 9/25

6:25 am-4:10 pm

1 stop9h 45m

Washington, D.C. Reagan-National

Sat 9/27

8:00 am-4:10 pm

1 stop8h 10m

$472

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

Showing 1-10 of 22 results

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.

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, D.C. Reagan-National Airport

What is the cheapest month to book a flight from Islip to Washington, D.C. Reagan-National Airport?

Currently, February is the cheapest month in which you can book a flight from Islip to Washington, D.C. Reagan-National Airport (average of $278). Flying from Islip to Washington, D.C. Reagan-National Airport in March is currently the most expensive (average of $335). 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.

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 to Washington, D.C. Reagan-National Airport as you normally would.

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 to Washington, D.C. Reagan-National Airport?
A quick flight from Islip to Washington, D.C. Reagan-National Airport can take about 6h 31m. Southwest provides one of the quickest options available for as low as $381. There are 248 mi between Islip and Washington, D.C. Reagan-National Airport. This flight may include one or multiple stops.
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.
What is the cheapest month to book a flight from Islip to Washington, D.C. Reagan-National Airport?
Currently, February is the cheapest month in which you can book a flight from Islip to Washington, D.C. Reagan-National Airport (average of $278). Flying from Islip to Washington, D.C. Reagan-National Airport in March is currently the most expensive (average of $335). 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

Woodbridge

Alexandria

Arlington

Tysons

Silver Spring

Springfield

Gaithersburg

Fredericksburg

Linthicum Heights

Fairfax

Falls Church

Owings Mills

Manassas

Rockville

Hanover

Oxon Hill

Laurel

Towson

Dundalk

National Harbor

Browse thousands of different options on Cheapflights for your next trip

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

$113+ Cheap flights from Islip (ISP) to Reagan-National (DCA)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/22. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Islip to Reagan-National 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 Reagan-National

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find 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 11, 2025.

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 11, 2025.

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.

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.

Cheapflights Insights

Everything you need to know about your flight from Islip to Washington, D.C. Reagan-National Airport

What is the cheapest month to book a flight from Islip to Washington, D.C. Reagan-National Airport?

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

Related info for your journey

Find useful and relevant information for your journey from Islip to Reagan-National. 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, D.C. Reagan-National?

How long is the flight from Islip 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?

What is the cheapest month to book a flight from Islip to Washington, D.C. Reagan-National Airport?

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

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 Reagan-National

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

100% Free

Book with Flexibility

Travel Smart

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 11, 2025.