What is the cheapest month to fly from Islip, New York 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, New York. Prices for April average $234 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 27% 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.

$127+ Flights from Islip, NY to Washington, D.C. Reagan-National Airport

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

Users have found that booking a flight from Islip, New York to Washington, D.C. Reagan-National Airport at least 32 days early can save you up to 156% on average compared to booking a flight this week. If booking 32 days before your flight isn’t an option for you, users have found flights from Islip, New York to Washington, D.C. Reagan-National Airport for as little as $298 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 $451 for flights departing within the next 3 days.

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Cheap flight deals from Islip to Reagan-National

Round-trip from	$255 (Southwest)
One-way from	$127 (JetBlue)
Popular in	December
Cheapest in	April
Average price	$227

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

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

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Highest demand for flights based on searches. 16% potential increase in price ($47 potential increase over avg. RT price).

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Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).

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Average for round-trip flights in June 2025

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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 June 12, 2025.

Wed 9/34:00 pmISP - DCA

1 stop6h 00mSouthwest

Wed 9/176:55 amDCA - ISP

1 stop6h 20mSouthwest

Deal found 6/10

$255

Thu 8/147:30 amISP - DCA

1 stop7h 15mMultiple Airlines

Mon 8/188:00 pmDCA - ISP

1 stop15h 41mMultiple Airlines

Deal found 6/10

$550

Fri 6/131:21 pmISP - DCA

1 stop7h 38mJetBlue

Sun 6/157:00 amDCA - ISP

1 stop6h 43mJetBlue

Deal found 6/10

$840

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 June 12, 2025.

Wed 9/34:00 pmISP - DCA

1 stop6h 00mSouthwest

Wed 9/176:55 amDCA - ISP

1 stop6h 20mSouthwest

Deal found 6/10

$255

Thu 8/147:30 amISP - DCA

1 stop7h 15mMultiple Airlines

Mon 8/188:00 pmDCA - ISP

1 stop15h 41mMultiple Airlines

Deal found 6/10

$550

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

Fri 6/131:21 pmISP - DCA

1 stop7h 38mJetBlue

Sun 6/157:00 amDCA - ISP

1 stop6h 43mJetBlue

Deal found 6/10

$840

Sat 6/216:30 amISP - DCA

1 stop7h 55mSouthwest

Sun 6/2211:35 amDCA - ISP

1 stop5h 45mSouthwest

Deal found 6/11

$527

Tue 7/87:30 amISP - DCA

1 stop5h 24mMultiple Airlines

Tue 7/157:00 amDCA - ISP

1 stop28h 41mMultiple Airlines

Deal found 6/10

$569

Thu 7/245:05 amISP - DCA

1 stop6h 20mSouthwest

Sun 7/276:55 amDCA - ISP

2 stops10h 25mSouthwest

Deal found 6/12

$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 June 12, 2025.

Sat 7/1211:40 amISP - DCA

1 stop9h 19mJetBlue

Deal found 6/11

$127

Tue 7/156:25 amISP - DCA

2 stops7h 55mSouthwest

Deal found 6/10

$169

Mon 7/214:33 pmISP - DCA

2 stops21h 49mMultiple Airlines

Deal found 6/11

$373

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 9/3

4:00 pm-10:00 pm

1 stop6h 00m

Washington, D.C. Reagan-National

Wed 9/17

6:55 am-1:15 pm

1 stop6h 20m

$255

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Thu 8/14

7:30 am-2:45 pm

1 stop7h 15m

Washington, D.C. Reagan-National

Mon 8/18

8:00 pm-11:41 am

1 stop15h 41m

$550

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sat 7/12

11:40 am-8:59 pm

1 stop9h 19m

$127

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Tue 7/15

6:25 am-2:20 pm

2 stops7h 55m

$169

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Mon 7/21

4:33 pm-2:22 pm

2 stops21h 49m

$373

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

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, February is the cheapest month in which you can book a flight from Islip, New York to Washington, D.C. Reagan-National Airport (average of $278). Flying from Islip, New York to Washington, D.C. Reagan-National Airport in June is currently the most expensive (average of $337). 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, New York to Washington, D.C. Reagan-National Airport as you normally would.

Rainfall in Reagan-National by month

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.

Temperature in Reagan-National by month

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).

Reviews of airlines servicing Reagan-National

Southwest

8.0

Very good

4,287 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Southwest

8.0

Very good

4,287 reviews

Southwest

8.0

Very good

4,287 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

JetBlue

7.3

Good

2,925 reviews

Southwest

8.0

Very good

4,287 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

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.
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, February is the cheapest month in which you can book a flight from Islip, New York to Washington, D.C. Reagan-National Airport (average of $278). Flying from Islip, New York to Washington, D.C. Reagan-National Airport in June is currently the most expensive (average of $337). 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.

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$127+ 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 7/12. 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 June 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 June 12, 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, New York to Washington, D.C. Reagan-National Airport?

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

Find hourly flight availability from Islip to Reagan-National. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 12, 2025.

Rainfall in Reagan-National by month

Plan your trip to Reagan-National by taking into account the average rainfall totals by month.

Temperature in Reagan-National by month

Plan your trip to Reagan-National by taking into account the average temperature totals by month.

Reviews of airlines servicing Reagan-National

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?

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 Islip?

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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 June 12, 2025.