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Cheap flights from Islip, New York to Washington, D.C. from $118

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Islip, New York to Washington, D.C. departing on 9/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Islip, New York to Washington, D.C.

Cheap round-trip flights

Southwest Logo
3:20 pm - 10:55 pmISP-DCA
7h 35m1 stop
Southwest Logo
11:55 am - 10:35 pmDCA-ISP
10h 40m1 stop
$302Southwest
Find Deal
Mon, Oct 27 - Thu, Nov 6
JetBlue Logo
12:15 pm - 10:29 pmISP-DCA
10h 14m1 stop
JetBlue Logo
5:45 pm - 9:42 amDCA-ISP
15h 57m2 stops
$388JetBlue
Find Deal
Mon, Oct 27 - Thu, Nov 6
Southwest Logo
2:05 pm - 10:00 pmISP-DCA
7h 55m2 stops
Southwest Logo
8:00 am - 4:10 pmDCA-ISP
8h 10m1 stop
$434Southwest
Find Deal
Wed, Aug 20 - Sat, Aug 23
Southwest Logo
5:30 am - 11:10 amISP-DCA
5h 40m1 stop
Southwest Logo
8:00 am - 4:10 pmDCA-ISP
8h 10m1 stop
$447Southwest
Find Deal
Wed, Aug 20 - Sat, Aug 23
Southwest Logo
3:20 pm - 10:55 pmISP-DCA
7h 35m1 stop
Southwest Logo
11:50 am - 10:10 pmDCA-ISP
10h 20m1 stop
$456Southwest
Find Deal
Fri, Oct 17 - Mon, Oct 20
Southwest Logo
4:20 pm - 10:25 pmISP-DCA
6h 05m1 stop
Southwest Logo
6:55 am - 1:15 pmDCA-ISP
6h 20m1 stop
$467Southwest
Find Deal
Mon, Aug 18 - Tue, Aug 19
Southwest Logo
4:20 pm - 10:25 pmISP-DCA
6h 05m1 stop
Southwest Logo
6:55 am - 3:15 pmDCA-ISP
8h 20m2 stops
$472Southwest
Find Deal
Mon, Aug 18 - Tue, Aug 19
Southwest Logo
4:20 pm - 10:25 pmISP-DCA
6h 05m1 stop
Southwest Logo
6:55 am - 1:15 pmDCA-ISP
6h 20m1 stop
$477Southwest
Find Deal
Mon, Aug 18 - Tue, Aug 19
Southwest Logo
4:20 pm - 10:25 pmISP-DCA
6h 05m1 stop
Southwest Logo
6:55 am - 3:15 pmDCA-ISP
8h 20m2 stops
$482Southwest
Find Deal
Mon, Aug 18 - Tue, Aug 19
Logo
4:33 pm - 3:20 pmISP-DCA
22h 47m2 stops
Logo
9:05 am - 8:01 pmDCA-ISP
10h 56m2 stops
$697
Find Deal
Mon, Oct 27 - Thu, Nov 6

Southwest flights from Islip, New York to Washington, D.C. Reagan-National Airport

Our best Southwest deals on Islip, New York to Washington, D.C. Reagan-National Airport flight tickets
Southwest
Oct 27
ISP3:20 pmIslip Long Island
7h 35m
1 stop
DCA10:55 pmWashington, D.C. Reagan-National
Nov 6
DCA11:55 amWashington, D.C. Reagan-National
10h 40m
1 stop
ISP10:35 pmIslip Long Island
$302
Find similar
Southwest
Aug 20
ISP2:05 pmIslip Long Island
7h 55m
2 stops
DCA10:00 pmWashington, D.C. Reagan-National
Aug 23
DCA8:00 amWashington, D.C. Reagan-National
8h 10m
1 stop
ISP4:10 pmIslip Long Island
$434
Find similar
Southwest
Aug 20
ISP5:30 amIslip Long Island
5h 40m
1 stop
DCA11:10 amWashington, D.C. Reagan-National
Aug 23
DCA8:00 amWashington, D.C. Reagan-National
8h 10m
1 stop
ISP4:10 pmIslip Long Island
$447
Find similar

JetBlue flights from Islip, New York to Washington, D.C. Reagan-National Airport

Our best JetBlue deals on Islip, New York to Washington, D.C. Reagan-National Airport flight tickets
JetBlue
Oct 27
ISP12:15 pmIslip Long Island
10h 14m
1 stop
DCA10:29 pmWashington, D.C. Reagan-National
Nov 6
DCA5:45 pmWashington, D.C. Reagan-National
15h 57m
2 stops
ISP9:42 amIslip Long Island
$388
Find similar
JetBlue
Aug 12
ISP12:35 pmIslip Long Island
8h 24m
1 stop
DCA8:59 pmWashington, D.C. Reagan-National
Aug 19
DCA9:02 amWashington, D.C. Reagan-National
7h 28m
1 stop
ISP4:30 pmIslip Long Island
$996
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Islip, New York to Washington, D.C. Reagan-National Airport that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated August 5, 2025.
Use the filters below to find and compare flights from Islip, New York 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

Mon 10/27

3:20 pm-10:55 pm

1 stop7h 35m

Washington, D.C. Reagan-National

Thu 11/6

11:55 am-10:35 pm

1 stop10h 40m

$302

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Mon 10/27

12:15 pm-10:29 pm

1 stop10h 14m

Washington, D.C. Reagan-National

Thu 11/6

5:45 pm-9:42 am

2 stops15h 57m

$388

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 8/20

2:05 pm-10:00 pm

2 stops7h 55m

Washington, D.C. Reagan-National

Sat 8/23

8:00 am-4:10 pm

1 stop8h 10m

$434

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 8/20

5:30 am-11:10 am

1 stop5h 40m

Washington, D.C. Reagan-National

Sat 8/23

8:00 am-4:10 pm

1 stop8h 10m

$447

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 10/17

3:20 pm-10:55 pm

1 stop7h 35m

Washington, D.C. Reagan-National

Mon 10/20

11:50 am-10:10 pm

1 stop10h 20m

$456

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Mon 8/18

4:20 pm-10:25 pm

1 stop6h 05m

Washington, D.C. Reagan-National

Tue 8/19

6:55 am-1:15 pm

1 stop6h 20m

$467

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Mon 8/18

4:20 pm-10:25 pm

1 stop6h 05m

Washington, D.C. Reagan-National

Tue 8/19

6:55 am-3:15 pm

2 stops8h 20m

$472

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Mon 8/18

4:20 pm-10:25 pm

1 stop6h 05m

Washington, D.C. Reagan-National

Tue 8/19

6:55 am-1:15 pm

1 stop6h 20m

$477

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Mon 8/18

4:20 pm-10:25 pm

1 stop6h 05m

Washington, D.C. Reagan-National

Tue 8/19

6:55 am-3:15 pm

2 stops8h 20m

$482

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Mon 10/27

4:33 pm-3:20 pm

2 stops22h 47m

Washington, D.C. Reagan-National

Thu 11/6

9:05 am-8:01 pm

2 stops10h 56m

$697

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Washington, D.C. from

How to get the cheapest flight ticket from Islip, New York to Washington, D.C. Reagan-National Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Washington, D.C. Reagan-National Airport?

The cheapest day to depart from Islip, New York to Washington, D.C. Reagan-National Airport is on a Friday. Travelers who choose to depart for Washington, D.C. Reagan-National Airport on a Friday will often find tickets for as low as $300. Flights from Islip, New York to Washington, D.C. Reagan-National Airport on a Monday will generally be more expensive and average around $368. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Washington, D.C. Reagan-National Airport?

Our data shows that the cheapest Islip, New York to Washington, D.C. Reagan-National Airport flights are usually those with departure times in the evening. Our users have found flights to Washington, D.C. Reagan-National Airport in the evening for as low as $315. In contrast, the most expensive time of day to depart to Washington, D.C. Reagan-National Airport is at noon when prices are around $351.

When to book flights from Islip, New York to Washington, D.C. Reagan-National Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Islip, New York to Washington, D.C. Reagan-National Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Islip, New York to Washington, D.C. Reagan-National Airport (ISP to DCA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Islip, New York to Washington, D.C. Reagan-National Airport

Best Price Found

$118

Fastest flight time

5h 40m

Direct flights

None
The best one-way flight to Washington, D.C. Reagan-National Airport from Islip, New York in the past 72 hours is $118. The best round-trip flight deal from Islip, New York to Washington, D.C. Reagan-National Airport found on momondo in the last 72 hours is $302.
The fastest flight from Islip, New York to Washington, D.C. Reagan-National Airport takes 5h 40m
There are no direct flights from Islip, New York to Washington, D.C. Reagan-National Airport. Popular non-direct route for this connection is Islip Long Island Airport - Washington, D.C. Reagan-National Airport.
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  • How far is Islip Long Island to Washington, D.C. Reagan-National by plane?

    The distance between Islip Long Island and Washington, D.C. Reagan-National is about 240.8 mi. In terms of flight time, this usually takes a little over 5h 40m.

  • When did momondo last update prices for flights from Islip Long Island Airport to Washington, D.C. Reagan-National Airport?

    Prices for flights from Islip Long Island Airport to Washington, D.C. Reagan-National Airport refresh daily.

  • How old do you have to be to fly from Islip Long Island Airport to Washington, D.C. Reagan-National Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Islip Long Island Airport to Washington, D.C. Reagan-National Airport.

  • What documentation or ID do you need to fly to Washington, D.C. Reagan-National Airport?

    The travel and health documents required for your trip to Washington, D.C. Reagan-National Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Washington, D.C. Reagan-National Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Traveling to a place near Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Alexandria
Gettysburg
Arlington
National Harbor
Woodbridge
Laurel
Silver Spring
Tysons
Waldorf
Fredericksburg
Colonial Beach
Manassas
Rockville
Towson
Gaithersburg
Fairfax
Reston
Glen Burnie
Linthicum Heights
Springfield

Why use momondo?

Why should I use momondo to find a flight deal from Islip to Washington, D.C.?

Finding the right flight to Washington, D.C. from Islip is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Washington, D.C. quick and easy, saving you time and money.

Can I find flights from Islip to Washington, D.C. with flexible booking policies on momondo?

Yes. All flights to Washington, D.C. from Islip on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Islip to Washington, D.C.?

momondo provides multiple filters to help you find the best flight to Washington, D.C. from Islip. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Islip to Washington, D.C. right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Islip to Washington, D.C. now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Washington, D.C. and let you know when they change.

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