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Cheap flights from Islip, New York to Washington, D.C. from $174

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 7/11. 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

Enter your travel dates to find the best prices.
Southwest Logo
5:20 am - 12:00 pm
ISP
-
DCA
6h 40m
1 stop
Southwest Logo
4:40 pm - 10:40 pm
DCA
-
ISP
6h 00m
1 stop
$347Southwest
Fri, Jul 17 - Tue, Jul 21
Southwest Logo
5:20 am - 12:00 pm
ISP
-
DCA
6h 40m
1 stop
Southwest Logo
6:55 am - 4:40 pm
DCA
-
ISP
9h 45m
1 stop
$352Southwest
Thu, Jul 23 - Sun, Jul 26
Southwest Logo
1:10 pm - 10:55 pm
ISP
-
DCA
9h 45m
1 stop
Southwest Logo
6:10 am - 4:00 pm
DCA
-
ISP
9h 50m
2 stops
$358Southwest
Wed, Oct 14 - Fri, Oct 16
Southwest Logo
5:20 am - 3:55 pm
ISP
-
DCA
10h 35m
1 stop
Southwest Logo
4:30 pm - 12:15 am
DCA
-
ISP
7h 45m
1 stop
$362Southwest
Fri, Jun 26 - Sun, Jun 28
Southwest Logo
6:25 am - 12:00 pm
ISP
-
DCA
5h 35m
1 stop
Southwest Logo
4:40 pm - 10:35 pm
DCA
-
ISP
5h 55m
1 stop
$367Southwest
Wed, Jun 17 - Wed, Jun 24
Southwest Logo
5:20 am - 3:55 pm
ISP
-
DCA
10h 35m
1 stop
Southwest Logo
5:25 pm - 11:40 pm
DCA
-
ISP
6h 15m
1 stop
$372Southwest
Fri, Jun 26 - Fri, Jul 3
Southwest Logo
6:25 am - 12:00 pm
ISP
-
DCA
5h 35m
1 stop
Southwest Logo
5:25 pm - 11:40 pm
DCA
-
ISP
6h 15m
1 stop
$387Southwest
Wed, Jun 24 - Fri, Jun 26
Southwest Logo
6:25 am - 12:00 pm
ISP
-
DCA
5h 35m
1 stop
Southwest Logo
5:25 pm - 11:40 pm
DCA
-
ISP
6h 15m
1 stop
$398Southwest
Wed, Jun 24 - Fri, Jun 26
Southwest Logo
1:15 pm - 11:55 pm
ISP
-
DCA
10h 40m
2 stops
Southwest Logo
6:00 am - 11:55 am
DCA
-
ISP
5h 55m
1 stop
$403Southwest
Mon, Aug 10 - Thu, Aug 13
Southwest Logo
5:20 am - 12:00 pm
ISP
-
DCA
6h 40m
1 stop
Southwest Logo
5:25 pm - 11:40 pm
DCA
-
ISP
6h 15m
1 stop
$418Southwest
Thu, Jun 11 - Mon, Jun 15

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
Jul 17
ISP5:20 amIslip Long Island
6h 40m
1 stop
DCA12:00 pmWashington, D.C. Reagan-National
Jul 21
DCA4:40 pmWashington, D.C. Reagan-National
6h 00m
1 stop
ISP10:40 pmIslip Long Island
$347
Southwest
Jul 23
ISP5:20 amIslip Long Island
6h 40m
1 stop
DCA12:00 pmWashington, D.C. Reagan-National
Jul 26
DCA6:55 amWashington, D.C. Reagan-National
9h 45m
1 stop
ISP4:40 pmIslip Long Island
$352
Southwest
Oct 14
ISP1:10 pmIslip Long Island
9h 45m
1 stop
DCA10:55 pmWashington, D.C. Reagan-National
Oct 16
DCA6:10 amWashington, D.C. Reagan-National
9h 50m
2 stops
ISP4:00 pmIslip Long Island
$358

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
Jul 22
ISP6:00 amIslip Long Island
8h 15m
1 stop
DCA2:15 pmWashington, D.C. Reagan-National
Jul 30
DCA3:10 pmWashington, D.C. Reagan-National
6h 34m
1 stop
ISP9:44 pmIslip Long Island
$488
JetBlue
Jun 9
ISP12:30 pmIslip Long Island
10h 02m
1 stop
DCA10:32 pmWashington, D.C. Reagan-National
Jun 11
DCA7:10 amWashington, D.C. Reagan-National
7h 49m
1 stop
ISP2:59 pmIslip Long Island
$490
JetBlue
Jun 11
ISP11:30 amIslip Long Island
8h 29m
1 stop
DCA7:59 pmWashington, D.C. Reagan-National
Jun 15
DCA7:10 amWashington, D.C. Reagan-National
7h 02m
1 stop
ISP2:12 pmIslip Long Island
$502

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 May 29, 2026.
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

Cheapest round-trip

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 7/17

5:20 am-12:00 pm

1 stop6h 40m

Washington, D.C. Reagan-National

Tue 7/21

4:40 pm-10:40 pm

1 stop6h 00m

$347

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Thu 7/23

5:20 am-12:00 pm

1 stop6h 40m

Washington, D.C. Reagan-National

Sun 7/26

6:55 am-4:40 pm

1 stop9h 45m

$352

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 10/14

1:10 pm-10:55 pm

1 stop9h 45m

Washington, D.C. Reagan-National

Fri 10/16

6:10 am-4:00 pm

2 stops9h 50m

$358

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 6/26

5:20 am-3:55 pm

1 stop10h 35m

Washington, D.C. Reagan-National

Sun 6/28

4:30 pm-12:15 am

1 stop7h 45m

$362
Quickest round-trip

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 6/17

6:25 am-12:00 pm

1 stop5h 35m

Washington, D.C. Reagan-National

Wed 6/24

4:40 pm-10:35 pm

1 stop5h 55m

$367

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 6/26

5:20 am-3:55 pm

1 stop10h 35m

Washington, D.C. Reagan-National

Fri 7/3

5:25 pm-11:40 pm

1 stop6h 15m

$372

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 6/24

6:25 am-12:00 pm

1 stop5h 35m

Washington, D.C. Reagan-National

Fri 6/26

5:25 pm-11:40 pm

1 stop6h 15m

$387

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 6/24

6:25 am-12:00 pm

1 stop5h 35m

Washington, D.C. Reagan-National

Fri 6/26

5:25 pm-11:40 pm

1 stop6h 15m

$398

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Mon 8/10

1:15 pm-11:55 pm

2 stops10h 40m

Washington, D.C. Reagan-National

Thu 8/13

6:00 am-11:55 am

1 stop5h 55m

$403

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Thu 6/11

5:20 am-12:00 pm

1 stop6h 40m

Washington, D.C. Reagan-National

Mon 6/15

5:25 pm-11:40 pm

1 stop6h 15m

$418

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 Saturday. Travelers who choose to depart for Washington, D.C. Reagan-National Airport on a Saturday will often find tickets for as low as $295. Flights from Islip, New York to Washington, D.C. Reagan-National Airport on a Sunday will generally be more expensive and average around $365. 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 $313. In contrast, the most expensive time of day to depart to Washington, D.C. Reagan-National Airport is in the afternoon when prices are around $344.

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

Fastest flight time

5h 35m

Direct flights

None
The fastest flight from Islip, New York to Washington, D.C. Reagan-National Airport takes 5h 35m
There are no direct flights from Islip, New York to Washington, D.C. Reagan-National Airport. There are no popular flight routes from Islip, New York to Washington, D.C. Reagan-National Airport.
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Frequently asked questions about flying from Islip, New York to Washington, D.C. Reagan-National Airport

  • 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 35m.

  • 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
National Harbor
Gettysburg
Arlington
Waldorf
Woodbridge
Laurel
Gaithersburg
Colonial Beach
Fredericksburg
Silver Spring
Rockville
Towson
Manassas
Linthicum Heights
Tysons
Springfield
Bethesda
Fairfax
College Park

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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