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Cheap flights from Islip, New York to Washington, D.C. from $41

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 12/22. 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

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Frontier Logo
6:00 am - 7:22 amISP-BWI
25h 22m1 stop
Frontier Logo
6:00 am - 7:45 pmBWI-ISP
13h 45m1 stop
$142Frontier
Find Deal
Wed, Dec 17 - Thu, Jan 8
Frontier Logo
10:19 am - 8:16 pmISP-BWI
9h 57m1 stop
Frontier Logo
9:11 pm - 7:34 pmBWI-ISP
22h 23m1 stop
$156Frontier
Find Deal
Thu, Dec 4 - Mon, Dec 8
Multiple Airlines Logo
10:19 am - 8:16 pmISP-BWI
9h 57m1 stop
Multiple Airlines Logo
10:40 am - 9:13 amBWI-ISP
22h 33m1 stop
$165Multiple Airlines
Find Deal
Mon, Dec 8 - Wed, Dec 10
Multiple Airlines Logo
6:00 am - 6:55 pmISP-BWI
36h 55m2 stops
Multiple Airlines Logo
10:40 am - 7:34 pmBWI-ISP
8h 54m1 stop
$173Multiple Airlines
Find Deal
Fri, Dec 5 - Tue, Dec 9
Multiple Airlines Logo
12:37 pm - 1:29 pmISP-BWI
24h 52m2 stops
Multiple Airlines Logo
6:00 am - 7:45 pmBWI-ISP
13h 45m1 stop
$177Multiple Airlines
Find Deal
Wed, Dec 17 - Thu, Jan 8
Southwest Logo
5:40 am - 7:00 amISP-BWI
1h 20mnonstop
Southwest Logo
10:45 am - 11:55 amBWI-ISP
1h 10mnonstop
$206Southwest
Find Deal
Wed, Dec 17 - Thu, Jan 8
Southwest Logo
12:20 pm - 8:30 pmISP-DCA
8h 10m1 stop
Southwest Logo
7:30 am - 1:30 pmDCA-ISP
6h 00m1 stop
$327Southwest
Find Deal
Sat, Jan 10 - Fri, Jan 16
Southwest Logo
6:55 am - 3:55 pmISP-DCA
9h 00m1 stop
Southwest Logo
7:30 am - 5:05 pmDCA-ISP
9h 35m1 stop
$377Southwest
Find Deal
Fri, Dec 19 - Sun, Dec 21
Southwest Logo
9:15 am - 3:45 pmISP-DCA
6h 30m1 stop
Southwest Logo
7:55 am - 2:35 pmDCA-ISP
6h 40m1 stop
$378Southwest
Find Deal
Mon, Feb 2 - Tue, Feb 3
Frontier Logo
6:00 am - 9:59 pmISP-DCA
39h 59m2 stops
Frontier Logo
2:00 pm - 9:13 amDCA-ISP
19h 13m2 stops
$431Frontier
Find Deal
Wed, Dec 3 - Sun, Dec 7

Frontier flights from Islip, New York to Washington, D.C.

Our best Frontier deals on Islip, New York to Washington, D.C. flight tickets
Frontier
Dec 17
ISP6:00 amIslip Long Island
25h 22m
1 stop
BWI7:22 amBaltimore/Washington
Jan 8
BWI6:00 amBaltimore/Washington
13h 45m
1 stop
ISP7:45 pmIslip Long Island
$142
Find similar
Frontier
Dec 4
ISP10:19 amIslip Long Island
9h 57m
1 stop
BWI8:16 pmBaltimore/Washington
Dec 8
BWI9:11 pmBaltimore/Washington
22h 23m
1 stop
ISP7:34 pmIslip Long Island
$156
Find similar
Frontier
Jan 18
ISP8:45 pmIslip Long Island
10h 38m
1 stop
BWI7:23 amBaltimore/Washington
Feb 1
BWI9:55 pmBaltimore/Washington
20h 53m
1 stop
ISP6:48 pmIslip Long Island
$222
Find similar

Southwest flights from Islip, New York to Washington, D.C.

Our best Southwest deals on Islip, New York to Washington, D.C. flight tickets
Southwest
Dec 17
ISP5:40 amIslip Long Island
1h 20m
BWI7:00 amBaltimore/Washington
Jan 8
BWI10:45 amBaltimore/Washington
1h 10m
ISP11:55 amIslip Long Island
$206
Find similar
Southwest
Jan 10
ISP12:20 pmIslip Long Island
8h 10m
1 stop
DCA8:30 pmWashington, D.C. Reagan-National
Jan 16
DCA7:30 amWashington, D.C. Reagan-National
6h 00m
1 stop
ISP1:30 pmIslip Long Island
$327
Find similar
Southwest
Jan 18
ISP3:45 pmIslip Long Island
1h 20m
BWI5:05 pmBaltimore/Washington
Feb 1
BWI10:45 amBaltimore/Washington
1h 10m
ISP11:55 amIslip Long Island
$339
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Islip, New York to Washington, D.C. 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 November 20, 2025.
Use the filters below to find and compare flights from Islip, New York to Washington, D.C. that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Wed 12/17

6:00 am-7:22 am

1 stop25h 22m

Baltimore/Washington

Thu 1/8

6:00 am-7:45 pm

1 stop13h 45m

$142

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Thu 12/4

10:19 am-8:16 pm

1 stop9h 57m

Baltimore/Washington

Mon 12/8

9:11 pm-7:34 pm

1 stop22h 23m

$156

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Mon 12/8

10:19 am-8:16 pm

1 stop9h 57m

Baltimore/Washington

Wed 12/10

10:40 am-9:13 am

1 stop22h 33m

$165

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Fri 12/5

6:00 am-6:55 pm

2 stops36h 55m

Baltimore/Washington

Tue 12/9

10:40 am-7:34 pm

1 stop8h 54m

$173

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Wed 12/17

12:37 pm-1:29 pm

2 stops24h 52m

Baltimore/Washington

Thu 1/8

6:00 am-7:45 pm

1 stop13h 45m

$177

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Wed 12/17

5:40 am-7:00 am

Nonstop1h 20m

Baltimore/Washington

Thu 1/8

10:45 am-11:55 am

Nonstop1h 10m

$206

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sat 1/10

12:20 pm-8:30 pm

1 stop8h 10m

Washington, D.C. Reagan-National

Fri 1/16

7:30 am-1:30 pm

1 stop6h 00m

$327

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 12/19

6:55 am-3:55 pm

1 stop9h 00m

Washington, D.C. Reagan-National

Sun 12/21

7:30 am-5:05 pm

1 stop9h 35m

$377

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Mon 2/2

9:15 am-3:45 pm

1 stop6h 30m

Washington, D.C. Reagan-National

Tue 2/3

7:55 am-2:35 pm

1 stop6h 40m

$378

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 12/3

6:00 am-9:59 pm

2 stops39h 59m

Washington, D.C. Reagan-National

Sun 12/7

2:00 pm-9:13 am

2 stops19h 13m

$431

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.

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 month to fly to Washington, D.C.?

The month of May is, on average, the cheapest month to fly to Washington, D.C. from Islip, New York, with most prices found around $296. If you’re not able to fly to Washington, D.C. in May, then January is your next best option. Flight prices from Islip, New York to Washington, D.C. during January average around $320.

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

On average, the least expensive day to fly to Washington, D.C. from Islip, New York is on a Friday. momondo users have found tickets for Friday departures for as low as $346. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Islip, New York to Washington, D.C. for around $457.

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

In the morning is the cheapest time of day to fly from Islip, New York to Washington, D.C. when you can find flight prices for as low as $373. Flying to Washington, D.C. in the morning is an ideal time because this is during off-peak travel hours. Try not to purchase tickets at noon because they tend to be around $451. Of course, these prices can vary depending on the time of year and what airport you fly to.

What is the cheapest Islip Long Island to Washington, D.C. flight route?

Fly from Islip Long Island to Baltimore/Washington for the best Islip Long Island - Washington, D.C. flight prices

What cabin class options are available on Islip Long Island to Washington, D.C. flights?

There is only 1 cabin class available to choose from on Islip Long Island to Washington, D.C. flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Islip, New York to Washington, D.C. flights?

You could potentially save up to 19% on your flight if you consider stops on a Islip, New York to Washington, D.C. flight.

When to book flights from Islip, New York to Washington, D.C.

Are you open to changing your travel dates? Check out the ideal times to fly from Islip, New York to Washington, D.C. 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. (ISP to WAS) flight deals and tips

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

Best Price Found

$149

Fastest flight time

1h 20m

Direct flights

Mon, Tue, Thu, Fri, Sat and Sun

Airports in Washington, D.C.

1 airport
The best one-way flight to Washington, D.C. from Islip, New York in the past 72 hours is $149. The best round-trip flight deal from Islip, New York to Washington, D.C. found on momondo in the last 72 hours is $356.
The fastest flight from Islip, New York to Washington, D.C. takes 1h 20m
Direct flights go from Islip, New York to Washington, D.C. on Monday, Tuesday, Thursday, Friday, Saturday and Sunday. There are no airlines offering direct flights.
There is 1 airport near Washington, D.C.: Baltimore/Washington (BWI)
Search flight deals

  • How far is Islip Long Island to Washington, D.C. by plane?

    A flight from Islip Long Island to Washington, D.C. will travel around 238.7 mi. A reasonable flight in good conditions will take 1h 20m.

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

    Prices for flights from Islip Long Island Airport to Washington, D.C. are updated daily.

  • How many operators does momondo search for flights from Islip Long Island Airport to Washington, D.C.?

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, 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..

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

    The required travel and health documents for your Washington, D.C. trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Washington, D.C.. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Islip, New York to Washington, D.C.?

  • What is the most popular airline from Islip, New York to Washington, D.C.?

Best airlines flying from Islip, New York to Washington, D.C.

Compare and see reviews for airlines that fly from Islip, New York to Washington, D.C. with momondo
Airline
Rating
Free Cancellation
Price
SouthwestPriceFrom $250Free CancellationRating
8.0
4,251 reviews
Search Southwest flights

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

Why use momondo?

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

It is quick and easy to find Islip to Washington, D.C. flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Washington, D.C. that suits you.

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

All flight searches from Islip to Washington, D.C. on momondo can be filtered to show those which offer flexible booking policies.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Islip to Washington, D.C..

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 simply researching potential flights to Washington, D.C., momondo offers a useful price alert feature which will track prices for flights to Washington, D.C. from Islip and alert you when they change.

An easier way to manage your Washington, D.C. trip

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Find better results for your trip to the United States

Fly into one of these airports located in Washington, D.C.

Airports listed have a maximum distance of 22.4 mi from Washington, D.C.
Washington, D.C. Reagan-National Airport
Washington, D.C. Dulles Intl Airport