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Cheap flights from Islip to Washington, D.C. from $113

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 to Washington, D.C. departing on 11/4. 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 to Washington, D.C.

Cheap round-trip flights

JetBlue Logo
11:35 am - 8:54 pmISP-DCA
9h 19m1 stop
JetBlue Logo
6:45 am - 1:02 pmDCA-ISP
6h 17m1 stop
$365JetBlue
Find Deal
Fri, Oct 24 - Sun, Oct 26
Southwest Logo
6:40 am - 4:00 pmISP-DCA
9h 20m1 stop
Southwest Logo
11:55 am - 10:35 pmDCA-ISP
10h 40m1 stop
$368Southwest
Find Deal
Fri, Oct 31 - Fri, Nov 7
Southwest Logo
6:40 am - 6:05 pmISP-DCA
11h 25m2 stops
Southwest Logo
11:55 am - 10:35 pmDCA-ISP
10h 40m1 stop
$373Southwest
Find Deal
Fri, Oct 31 - Fri, Nov 7
Southwest Logo
1:40 pm - 10:50 pmISP-DCA
9h 10m2 stops
Southwest Logo
6:55 am - 3:05 pmDCA-ISP
8h 10m2 stops
$378Southwest
Find Deal
Sun, Nov 9 - Wed, Nov 12
Southwest Logo
12:25 pm - 9:10 pmISP-DCA
8h 45m1 stop
Southwest Logo
11:55 am - 10:35 pmDCA-ISP
10h 40m1 stop
$472Southwest
Find Deal
Sat, Nov 8 - Sun, Nov 9
JetBlue Logo
11:35 am - 6:06 pmISP-DCA
6h 31m1 stop
JetBlue Logo
6:45 am - 1:02 pmDCA-ISP
6h 17m1 stop
$490JetBlue
Find Deal
Sat, Oct 25 - Sun, Oct 26
Southwest Logo
1:30 pm - 9:10 pmISP-DCA
7h 40m2 stops
Southwest Logo
11:55 am - 10:35 pmDCA-ISP
10h 40m1 stop
$499Southwest
Find Deal
Sat, Nov 8 - Sun, Nov 9
Southwest Logo
3:25 pm - 10:50 pmISP-DCA
7h 25m1 stop
Southwest Logo
11:55 am - 10:35 pmDCA-ISP
10h 40m1 stop
$506Southwest
Find Deal
Fri, Nov 21 - Sun, Nov 23
JetBlue Logo
10:29 am - 5:02 pmISP-DCA
6h 33m1 stop
JetBlue Logo
6:45 am - 3:30 pmDCA-ISP
8h 45m1 stop
$508JetBlue
Find Deal
Sun, Nov 2 - Wed, Nov 5
Multiple Airlines Logo
9:59 am - 7:32 pmISP-DCA
9h 33m2 stops
Multiple Airlines Logo
8:00 am - 4:15 pmDCA-ISP
8h 15m2 stops
$874Multiple Airlines
Find Deal
Sat, Nov 8 - Sun, Nov 9

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

Our best JetBlue deals on Islip to Washington, D.C. Reagan-National Airport flight tickets
JetBlue
Oct 24
ISP11:35 amIslip Long Island
9h 19m
1 stop
DCA8:54 pmWashington, D.C. Reagan-National
Oct 26
DCA6:45 amWashington, D.C. Reagan-National
6h 17m
1 stop
ISP1:02 pmIslip Long Island
$365
Find similar
JetBlue
Oct 25
ISP11:35 amIslip Long Island
6h 31m
1 stop
DCA6:06 pmWashington, D.C. Reagan-National
Oct 26
DCA6:45 amWashington, D.C. Reagan-National
6h 17m
1 stop
ISP1:02 pmIslip Long Island
$490
Find similar
JetBlue
Nov 2
ISP10:29 amIslip Long Island
6h 33m
1 stop
DCA5:02 pmWashington, D.C. Reagan-National
Nov 5
DCA6:45 amWashington, D.C. Reagan-National
8h 45m
1 stop
ISP3:30 pmIslip Long Island
$508
Find similar

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

Our best Southwest deals on Islip to Washington, D.C. Reagan-National Airport flight tickets
Southwest
Oct 31
ISP6:40 amIslip Long Island
9h 20m
1 stop
DCA4:00 pmWashington, D.C. Reagan-National
Nov 7
DCA11:55 amWashington, D.C. Reagan-National
10h 40m
1 stop
ISP10:35 pmIslip Long Island
$368
Find similar
Southwest
Oct 31
ISP6:40 amIslip Long Island
11h 25m
2 stops
DCA6:05 pmWashington, D.C. Reagan-National
Nov 7
DCA11:55 amWashington, D.C. Reagan-National
10h 40m
1 stop
ISP10:35 pmIslip Long Island
$373
Find similar
Southwest
Nov 9
ISP1:40 pmIslip Long Island
9h 10m
2 stops
DCA10:50 pmWashington, D.C. Reagan-National
Nov 12
DCA6:55 amWashington, D.C. Reagan-National
8h 10m
2 stops
ISP3:05 pmIslip Long Island
$378
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Islip 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 September 29, 2025.
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

Fri 10/24

11:35 am-8:54 pm

1 stop9h 19m

Washington, D.C. Reagan-National

Sun 10/26

6:45 am-1:02 pm

1 stop6h 17m

$365

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 10/31

6:40 am-4:00 pm

1 stop9h 20m

Washington, D.C. Reagan-National

Fri 11/7

11:55 am-10:35 pm

1 stop10h 40m

$368

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 10/31

6:40 am-6:05 pm

2 stops11h 25m

Washington, D.C. Reagan-National

Fri 11/7

11:55 am-10:35 pm

1 stop10h 40m

$373

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sun 11/9

1:40 pm-10:50 pm

2 stops9h 10m

Washington, D.C. Reagan-National

Wed 11/12

6:55 am-3:05 pm

2 stops8h 10m

$378

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sat 11/8

12:25 pm-9:10 pm

1 stop8h 45m

Washington, D.C. Reagan-National

Sun 11/9

11:55 am-10:35 pm

1 stop10h 40m

$472

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sat 10/25

11:35 am-6:06 pm

1 stop6h 31m

Washington, D.C. Reagan-National

Sun 10/26

6:45 am-1:02 pm

1 stop6h 17m

$490

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sat 11/8

1:30 pm-9:10 pm

2 stops7h 40m

Washington, D.C. Reagan-National

Sun 11/9

11:55 am-10:35 pm

1 stop10h 40m

$499

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 11/21

3:25 pm-10:50 pm

1 stop7h 25m

Washington, D.C. Reagan-National

Sun 11/23

11:55 am-10:35 pm

1 stop10h 40m

$506

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sun 11/2

10:29 am-5:02 pm

1 stop6h 33m

Washington, D.C. Reagan-National

Wed 11/5

6:45 am-3:30 pm

1 stop8h 45m

$508

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sat 11/8

9:59 am-7:32 pm

2 stops9h 33m

Washington, D.C. Reagan-National

Sun 11/9

8:00 am-4:15 pm

2 stops8h 15m

$874

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 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 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 $302. Flights from Islip 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 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 $311. In contrast, the most expensive time of day to depart to Washington, D.C. Reagan-National Airport is at noon when prices are around $353.

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

Are you open to changing your travel dates? Check out the ideal times to fly from Islip 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 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 to Washington, D.C. Reagan-National Airport

Direct flights

None
There are no direct flights from Islip to Washington, D.C. Reagan-National Airport. There are no popular flight routes from Islip to 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 6h 31m.

  • 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
National Harbor
Arlington
Woodbridge
Waldorf
Tysons
Laurel
Colonial Beach
Silver Spring
Fredericksburg
Towson
Rockville
Manassas
Fairfax
Reston
Glen Burnie
Gaithersburg
Springfield
Linthicum Heights

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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