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 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 $229 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 29% 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.

$99+ 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 27 days early can save you up to 188% 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, New York to Washington, D.C. Reagan-National Airport for as little as $308 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	$215 (lastminute.com)
One-way from	$99 (Southwest)
Popular in	December
Cheapest in	April
Average price	$229

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. 17% potential increase in price ($50 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 July 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 July 29, 2025.

Sat 9/611:35 amISP - DCA

1 stop9h 19mJetBlue

Sun 9/72:59 pmDCA - ISP

1 stop24h 24mJetBlue

Deal found 7/27

$215

Sat 9/66:05 amISP - DCA

1 stop10h 55mSouthwest

Sun 9/76:55 amDCA - ISP

2 stops10h 05mSouthwest

Deal found 7/27

$348

Sat 9/67:30 amISP - DCA

2 stops7h 52mMultiple Airlines

Mon 9/85:27 pmDCA - ISP

2 stops17h 31mMultiple Airlines

Deal found 7/28

$725

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 July 29, 2025.

Sat 9/611:35 amISP - DCA

1 stop9h 19mJetBlue

Sun 9/72:59 pmDCA - ISP

1 stop24h 24mJetBlue

Deal found 7/27

$215

Sat 9/66:05 amISP - DCA

1 stop10h 55mSouthwest

Sun 9/76:55 amDCA - ISP

2 stops10h 05mSouthwest

Deal found 7/27

$348

Sat 9/67:30 amISP - DCA

2 stops7h 52mMultiple Airlines

Mon 9/85:27 pmDCA - ISP

2 stops17h 31mMultiple Airlines

Deal found 7/28

$725

Last-minute flights from Islip to Reagan-National
Discover last-minute flight deals from Islip to Reagan-National. Data last updated July 29, 2025 and is based on user searches.

Fri 8/86:25 amISP - DCA

1 stop9h 45mSouthwest

Sun 8/106:05 amDCA - ISP

1 stop7h 50mSouthwest

Deal found 7/28

$592

Fri 8/87:30 amISP - DCA

2 stops9h 58mMultiple Airlines

Sun 8/101:00 pmDCA - ISP

2 stops7h 01mMultiple Airlines

Deal found 7/28

$1,097

Wed 8/202:05 pmISP - DCA

2 stops7h 55mSouthwest

Sat 8/306:55 amDCA - ISP

2 stops8h 10mSouthwest

Deal found 7/29

$364

Fri 8/222:19 pmISP - DCA

2 stops25h 03mMultiple Airlines

Sun 8/2410:13 amDCA - ISP

2 stops9h 48mMultiple Airlines

Deal found 7/27

$869

Fri 8/2912:55 pmISP - DCA

1 stop8h 04mJetBlue

Mon 9/17:40 amDCA - ISP

1 stop26h 54mJetBlue

Deal found 7/27

$393

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 July 29, 2025.

Wed 8/274:00 pmISP - DCA

1 stop6h 00mSouthwest

Deal found 7/28

$99

Fri 9/1211:35 amISP - DCA

1 stop9h 19mJetBlue

Deal found 7/28

$118

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

Sat 9/6

11:35 am-8:54 pm

1 stop9h 19m

Washington, D.C. Reagan-National

Sun 9/7

2:59 pm-3:23 pm

1 stop24h 24m

$215

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sat 9/6

6:05 am-5:00 pm

1 stop10h 55m

Washington, D.C. Reagan-National

Sun 9/7

6:55 am-5:00 pm

2 stops10h 05m

$348

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sat 9/6

7:30 am-3:22 pm

2 stops7h 52m

Washington, D.C. Reagan-National

Mon 9/8

5:27 pm-10:58 am

2 stops17h 31m

$725

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 8/27

4:00 pm-10:00 pm

1 stop6h 00m

$99

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 9/12

11:35 am-8:54 pm

1 stop9h 19m

$118

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

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

Reviews of airlines servicing Reagan-National

Peruse reviews from past customers who have flown with Southwest and JetBlue from Islip to Washington, D.C. Reagan-National Airport to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.0

Very good

4,238 reviews

Reviews

1 / 20

8.0

Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

Southwest

8.0

Very good

4,238 reviews

Southwest

8.0

Very good

4,238 reviews

Reviews

1 / 20

8.0

Excellent

Gina,Jul 2025

LAS - DEN

JetBlue

7.3

Good

2,913 reviews

Southwest

8.0

Very good

4,238 reviews

Reviews

1 / 20

8.0

Excellent

Gina,Jul 2025

LAS - DEN

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 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.

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$99+ 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 8/27. 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

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2. Select your favorite providers

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Cheap flight deals from Islip to Reagan-National

Round-trip from

One-way from

Popular in

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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 July 29, 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 July 29, 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 July 29, 2025.

Reviews of airlines servicing Reagan-National

Peruse reviews from past customers who have flown with Southwest and JetBlue from Islip to Washington, D.C. Reagan-National Airport to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

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 Washington, D.C. Reagan-National Airport?

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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 July 29, 2025.