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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Islip, New York-Washington, D.C. Reagan-National Airport flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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.

$124+ Flights from Islip, NY 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

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 diciembre 12, 2025.

vie. 12/127:00 amISP - DCA

1 stop8h 55mSouthwest

vie. 12/197:30 amDCA - ISP

1 stop9h 35mSouthwest

Deal found 12/11

$652

dom. 12/1410:45 amISP - DCA

1 stop27h 42mJetBlue

mié. 12/1711:00 amDCA - ISP

1 stop23h 01mJetBlue

Deal found 12/11

$854

jue. 12/2510:46 amISP - DCA

1 stop6h 34mMultiple Airlines

lun. 12/292:00 pmDCA - ISP

1 stop5h 45mMultiple Airlines

Deal found 12/10

$922

vie. 12/1211:50 amISP - DCA

1 stop10h 49mMultiple Airlines

dom. 12/147:30 amDCA - ISP

1 stop8h 40mMultiple Airlines

Deal found 12/10

$952

jue. 12/113:40 pmISP - DCA

1 stop7h 10mSouthwest

dom. 12/1411:55 amDCA - ISP

1 stop10h 40mSouthwest

Deal found 12/11

$1,002

vie. 12/121:40 pmISP - DCA

2 stops9h 10mSouthwest

dom. 12/1411:55 amDCA - ISP

1 stop10h 40mSouthwest

Deal found 12/10

$1,008

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 diciembre 12, 2025.

mar. 1/139:15 amISP - DCA

1 stop6h 30mSouthwest

jue. 1/157:30 amDCA - ISP

1 stop6h 00mSouthwest

Deal found 12/9

$367

lun. 2/210:00 amISP - DCA

2 stops11h 45mMultiple Airlines

mar. 2/310:05 amDCA - ISP

1 stop6h 05mMultiple Airlines

Deal found 12/11

$731

lun. 1/129:15 amISP - DCA

2 stops8h 45mSouthwest

jue. 1/157:30 amDCA - ISP

1 stop6h 00mSouthwest

Deal found 12/9

$403

vie. 1/162:10 pmISP - DCA

2 stops8h 45mSouthwest

dom. 1/187:55 amDCA - ISP

1 stop6h 40mSouthwest

Deal found 12/11

$427

lun. 2/29:15 amISP - DCA

1 stop6h 30mSouthwest

mar. 2/37:55 amDCA - ISP

1 stop6h 40mSouthwest

Deal found 12/11

$427

jue. 1/16:15 amISP - DCA

2 stops11h 10mSouthwest

dom. 1/46:55 amDCA - ISP

1 stop7h 05mSouthwest

Deal found 12/10

$597

vie. 1/21:35 pmISP - DCA

1 stop7h 10mSouthwest

dom. 1/46:55 amDCA - ISP

1 stop7h 05mSouthwest

Deal found 12/11

$647

Last-minute flights from Islip to Reagan-National
Discover last-minute flight deals from Islip to Reagan-National. Data last updated diciembre 12, 2025 and is based on user searches.

vie. 12/127:00 amISP - DCA

1 stop8h 55mSouthwest

vie. 12/197:30 amDCA - ISP

1 stop9h 35mSouthwest

Deal found 12/11

$652

jue. 1/16:15 amISP - DCA

2 stops11h 10mSouthwest

dom. 1/46:55 amDCA - ISP

1 stop7h 05mSouthwest

Deal found 12/10

$597

vie. 1/21:35 pmISP - DCA

1 stop7h 10mSouthwest

dom. 1/46:55 amDCA - ISP

1 stop7h 05mSouthwest

Deal found 12/11

$647

dom. 1/47:25 amISP - DCA

1 stop6h 35mMultiple Airlines

lun. 1/59:10 amDCA - ISP

1 stop7h 00mMultiple Airlines

Deal found 12/11

$749

lun. 1/129:15 amISP - DCA

2 stops8h 45mSouthwest

jue. 1/157:30 amDCA - ISP

1 stop6h 00mSouthwest

Deal found 12/9

$403

mar. 1/139:15 amISP - DCA

1 stop6h 30mSouthwest

jue. 1/157:30 amDCA - ISP

1 stop6h 00mSouthwest

Deal found 12/9

$367

vie. 1/162:10 pmISP - DCA

2 stops8h 45mSouthwest

dom. 1/187:55 amDCA - ISP

1 stop6h 40mSouthwest

Deal found 12/11

$427

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 diciembre 12, 2025.

jue. 1/227:43 pmISP - DCA

1 stop19h 16mMultiple Airlines

Deal found 12/10

$124

mié. 1/2112:25 pmISP - DCA

1 stop6h 53mJetBlue

Deal found 12/10

$177

jue. 1/16:15 amISP - DCA

2 stops11h 10mSouthwest

Deal found 12/9

$229

mié. 12/313:40 pmISP - DCA

1 stop6h 55mSouthwest

Deal found 12/9

$234

mié. 12/1711:50 amISP - DCA

1 stop7h 05mJetBlue

Deal found 12/9

$282

sáb. 12/2010:46 amISP - DCA

1 stop7h 19mJetBlue

Deal found 12/11

$337

lun. 12/2910:46 amISP - DCA

1 stop6h 34mJetBlue

Deal found 12/11

$512

vie. 1/22:45 pmISP - DCA

2 stops8h 05mSouthwest

Deal found 12/9

$523

jue. 1/111:40 amISP - DCA

3 stops34h 19mMultiple Airlines

Deal found 12/11

$538

dom. 12/2810:46 amISP - DCA

1 stop6h 34mJetBlue

Deal found 12/10

$809

Find flight deals from Islip to Reagan-National

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$367 (Southwest)
One-way from	$124 (Trip.com)
Popular in	January
Cheapest in	April
Average price	$254

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. 22% potential increase in price ($62 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease ($9 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

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

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

mar. 1/13

9:15 am-3:45 pm

1 stop6h 30m

Washington, D.C. Reagan-National

jue. 1/15

7:30 am-1:30 pm

1 stop6h 00m

$367

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

lun. 1/12

9:15 am-6:00 pm

2 stops8h 45m

Washington, D.C. Reagan-National

jue. 1/15

7:30 am-1:30 pm

1 stop6h 00m

$403

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

vie. 1/16

2:10 pm-10:55 pm

2 stops8h 45m

Washington, D.C. Reagan-National

dom. 1/18

7:55 am-2:35 pm

1 stop6h 40m

$427

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

lun. 2/2

9:15 am-3:45 pm

1 stop6h 30m

Washington, D.C. Reagan-National

mar. 2/3

7:55 am-2:35 pm

1 stop6h 40m

$427

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

jue. 1/1

6:15 am-5:25 pm

2 stops11h 10m

Washington, D.C. Reagan-National

dom. 1/4

6:55 am-2:00 pm

1 stop7h 05m

$597

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

vie. 1/2

1:35 pm-8:45 pm

1 stop7h 10m

Washington, D.C. Reagan-National

dom. 1/4

6:55 am-2:00 pm

1 stop7h 05m

$647

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

lun. 2/2

10:00 am-9:45 pm

2 stops11h 45m

Washington, D.C. Reagan-National

mar. 2/3

10:05 am-4:10 pm

1 stop6h 05m

$731

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

jue. 1/22

7:43 pm-2:59 pm

1 stop19h 16m

$124

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

mié. 1/21

12:25 pm-7:18 pm

1 stop6h 53m

$177

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

lun. 1/26

12:25 pm-10:31 pm

1 stop10h 06m

$177

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Showing 1-10 of 15 results

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 December.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Islip, New York-Washington, D.C. Reagan-National Airport flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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.

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, New York to Washington, D.C. Reagan-National Airport?

Currently, July is the cheapest month in which you can book a flight from Islip, New York to Washington, D.C. Reagan-National Airport (average of $64). Flying from Islip, New York to Washington, D.C. Reagan-National Airport in September is currently the most expensive (average of $127). 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.

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 30m. 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.
What is the cheapest month to book a flight from Islip, New York to Washington, D.C. Reagan-National Airport?
Currently, July is the cheapest month in which you can book a flight from Islip, New York to Washington, D.C. Reagan-National Airport (average of $64). Flying from Islip, New York to Washington, D.C. Reagan-National Airport in September is currently the most expensive (average of $127). 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

Alexandria

Woodbridge

Tysons

Arlington

Owings Mills

Springfield

Hanover

Silver Spring

Fredericksburg

Fairfax

Linthicum Heights

Manassas

Rockville

Laurel

Towson

National Harbor

Bowie

Largo

McLean

Clinton

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.

$124+ Cheap flights from Islip, NY (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 1/22. 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

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 diciembre 12, 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 diciembre 12, 2025.

Find flight deals from Islip to Reagan-National

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

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.

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 December.

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, New York to Washington, D.C. Reagan-National Airport?

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, 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?

What is the cheapest month to book a flight from Islip, New York 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 diciembre 12, 2025.