What is the cheapest airline that flies from Washington, D.C. to Islip Long Island?

Frontier and Southwest are the most popular carriers operating from Washington, D.C. to Islip Long Island

How long does it take to fly to Islip, New York?

The flight from Washington, D.C. to Islip, New York depends on which airports you’re departing and arriving from and whether or not you have a layover. If you fly from Washington, D.C. (a popular airport in Washington, D.C.) to New York John F Kennedy Intl Airport (the most popular airport in Islip, New York), then the flight time is 1h 18m on average. If you fly from Baltimore (another popular airport in Washington, D.C.) to New York John F Kennedy Intl Airport, then the average flight time is 4h 14m.

How many flights depart from Washington, D.C. to Islip, New York on average per week?

As of April 2026, 15 flights take off from Washington, D.C. and land in Islip, New York each week. The most common flight departure day for this route is Mon, with 27% of weekly flights taking off on this day.

What airlines fly to Islip, New York?

United Airlines, Delta and American Airlines are the top three most popular airlines that fly to Islip, New York from Washington, D.C. according to our data. United Airlines is the first choice among our users, with 41% of people opting to fly with this airline when traveling to Islip, New York. Keep in mind that there are 5 different airlines that fly to Islip, New York on a routine basis, so you have a few additional options to choose from.

How many flights depart from Washington, D.C. to Islip, New York on average per day?

2 flights are operational daily from Washington, D.C. to Islip, New York as of April 2026. The most popular departure time for this route is 10:00AM, with 46% of flights per day taking off in the evening.

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

Prices for flights from Washington, D.C. to Islip Long Island Airport are refreshed on a daily basis.

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

As of April 2026, there is 1 operator available to choose from for flights from Washington, D.C. to Islip Long Island Airport.

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

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Washington, D.C. to Islip Long Island Airport.

What documentation or ID do you need to fly to Islip Long Island Airport?

The travel and health documents you'll need for your trip to Islip Long Island Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Islip Long Island Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$76 Cheap Flights from Washington, D.C. to Islip in 2026

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Find the cheapest flights from Washington, D.C. to New York

Round-trip

One-way

Last minute

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Cheap round-trip flights

Enter your travel dates to find the best prices.

2:52 pm - 10:05 am

IAD

ISP

19h 13m

2 stops

5:38 pm - 4:22 pm

ISP

IAD

22h 44m

1 stop

$185Multiple Airlines

Fri, May 15 - Tue, May 19

7:12 pm - 10:05 am

IAD

ISP

14h 53m

1 stop

5:38 pm - 4:22 pm

ISP

IAD

22h 44m

1 stop

$196Frontier

Thu, May 14 - Tue, May 19

8:12 am - 9:13 am

IAD

ISP

25h 01m

1 stop

5:38 pm - 4:22 pm

ISP

IAD

22h 44m

1 stop

$197Frontier

Sat, May 2 - Tue, May 5

6:49 am - 5:58 pm

IAD

ISP

11h 09m

2 stops

5:38 pm - 4:22 pm

ISP

IAD

22h 44m

1 stop

$200Frontier

Sat, May 16 - Tue, May 19

7:27 pm - 10:05 am

IAD

ISP

14h 38m

1 stop

10:48 am - 10:22 am

ISP

IAD

23h 34m

2 stops

$214Multiple Airlines

Fri, Jun 5 - Wed, Jun 10

8:12 am - 9:13 am

IAD

ISP

25h 01m

1 stop

5:38 pm - 4:22 pm

ISP

IAD

22h 44m

1 stop

$218Frontier

Sat, May 2 - Tue, May 5

6:00 am - 12:05 pm

DCA

ISP

6h 05m

1 stop

5:35 am - 11:10 am

ISP

DCA

5h 35m

1 stop

$347Southwest

Fri, May 29 - Sat, Jun 6

3:55 pm - 10:40 pm

DCA

ISP

6h 45m

1 stop

2:30 pm - 10:25 pm

ISP

DCA

7h 55m

2 stops

$352Southwest

Sat, May 30 - Tue, Jun 2

6:00 am - 12:05 pm

DCA

ISP

6h 05m

1 stop

5:10 pm - 10:50 pm

ISP

DCA

5h 40m

1 stop

$357Southwest

Mon, May 18 - Mon, May 18

6:00 am - 11:55 am

DCA

ISP

5h 55m

1 stop

10:30 am - 6:50 pm

ISP

DCA

8h 20m

1 stop

$367Southwest

Fri, Sep 18 - Sun, Sep 20

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

Our best Southwest deals on Washington, D.C. to Islip, New York flight tickets

Southwest

May 14

BWI10:20 pmBaltimore/Washington

1h 10m

ISP11:30 pmIslip Long Island

May 16

ISP9:20 amIslip Long Island

1h 20m

BWI10:40 amBaltimore/Washington

$279

Southwest

Jul 1

BWI6:50 amBaltimore/Washington

1h 15m

ISP8:05 amIslip Long Island

Jul 7

ISP2:55 pmIslip Long Island

1h 15m

BWI4:10 pmBaltimore/Washington

$311

Southwest

May 8

BWI3:20 pmBaltimore/Washington

1h 10m

ISP4:30 pmIslip Long Island

May 12

ISP6:30 amIslip Long Island

1h 20m

BWI7:50 amBaltimore/Washington

$322

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

Our best Frontier deals on Washington, D.C. to Islip, New York flight tickets

Frontier

May 14

IAD7:12 pmWashington, D.C. Dulles Intl

14h 53m

1 stop

ISP10:05 amIslip Long Island

May 19

ISP5:38 pmIslip Long Island

22h 44m

1 stop

IAD4:22 pmWashington, D.C. Dulles Intl

$196

Frontier

May 2

IAD8:12 amWashington, D.C. Dulles Intl

25h 01m

1 stop

ISP9:13 amIslip Long Island

May 5

ISP5:38 pmIslip Long Island

22h 44m

1 stop

IAD4:22 pmWashington, D.C. Dulles Intl

$197

Frontier

May 16

IAD6:49 amWashington, D.C. Dulles Intl

11h 09m

2 stops

ISP5:58 pmIslip Long Island

May 19

ISP5:38 pmIslip Long Island

22h 44m

1 stop

IAD4:22 pmWashington, D.C. Dulles Intl

$200

momondo Fare Finder

Use the filters below to find and compare flights from Washington, D.C. to Islip, New York that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Fri 5/15

2:52 pm-10:05 am

2 stops19h 13m

Islip Long Island

Tue 5/19

5:38 pm-4:22 pm

1 stop22h 44m

$185

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Thu 5/14

7:12 pm-10:05 am

1 stop14h 53m

Islip Long Island

Tue 5/19

5:38 pm-4:22 pm

1 stop22h 44m

$196

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Sat 5/2

8:12 am-9:13 am

1 stop25h 01m

Islip Long Island

Tue 5/5

5:38 pm-4:22 pm

1 stop22h 44m

$197

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Sat 5/16

6:49 am-5:58 pm

2 stops11h 09m

Islip Long Island

Tue 5/19

5:38 pm-4:22 pm

1 stop22h 44m

$200

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Fri 6/5

7:27 pm-10:05 am

1 stop14h 38m

Islip Long Island

Wed 6/10

10:48 am-10:22 am

2 stops23h 34m

$214

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Sat 5/2

8:12 am-9:13 am

1 stop25h 01m

Islip Long Island

Tue 5/5

5:38 pm-4:22 pm

1 stop22h 44m

$218

Quickest round-trip

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Fri 5/29

6:00 am-12:05 pm

1 stop6h 05m

Islip Long Island

Sat 6/6

5:35 am-11:10 am

1 stop5h 35m

$347

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Sat 5/30

3:55 pm-10:40 pm

1 stop6h 45m

Islip Long Island

Tue 6/2

2:30 pm-10:25 pm

2 stops7h 55m

$352

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Mon 5/18

6:00 am-12:05 pm

1 stop6h 05m

Islip Long Island

Mon 5/18

5:10 pm-10:50 pm

1 stop5h 40m

$357

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Fri 9/18

6:00 am-11:55 am

1 stop5h 55m

Islip Long Island

Sun 9/20

10:30 am-6:50 pm

1 stop8h 20m

$367

Flights are sorted by cheapest round-trip flights first.

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

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

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

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

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

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

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

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

Estimated round-trip price

Cheap Washington, D.C. to Islip, New York (WAS to ISP) flight deals and tips

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

Best Price Found	$139
Fastest flight time	1h 10m
Direct flights	Mon, Tue, Thu, Fri, Sat and Sun
Airports in Islip, New York	1 airport

The best one-way flight to Islip, New York from Washington, D.C. in the past 72 hours is $139. The best round-trip flight deal from Washington, D.C. to Islip, New York found on momondo in the last 72 hours is $336.

The fastest flight from Washington, D.C. to Islip, New York takes 1h 10m

Direct flights go from Washington, D.C. to Islip, New York on Monday, Tuesday, Thursday, Friday, Saturday and Sunday. The only airline offering direct flights is Southwest.

There is 1 airport in Islip, New York. From Washington, D.C. there are direct flights to Islip Long Island (ISP).

Search flight deals

Frequently asked questions about flying from Washington, D.C. to Islip, New York

How far is Washington, D.C. to Islip Long Island by plane?
The straight-line distance from Washington, D.C. to Islip Long Island is 238.7 mi. Flights usually cover this in 1h 10m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Washington, D.C. to Islip Long Island Airport?
Prices for flights from Washington, D.C. to Islip Long Island Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Washington, D.C. to Islip Long Island Airport?
As of April 2026, there is 1 operator available to choose from for flights from Washington, D.C. to Islip Long Island Airport.
How old do you have to be to fly from Washington, D.C. to Islip Long Island Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Washington, D.C. to Islip Long Island Airport.
What documentation or ID do you need to fly to Islip Long Island Airport?
The travel and health documents you'll need for your trip to Islip Long Island Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Islip Long Island Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Washington, D.C. to Islip, New York?
Based on momondo bookings for flights between Washington, D.C. and Islip, New York, the leading plane model is Boeing 737 MAX 8, making up 16.84% of the total bookings. Other popular models include Boeing 737-800 Passenger/BBJ2 (winglets) with 16.84%, Embraer 175 (Enhanced Winglets) with 8.42%, and Airbus A220-300 with 7.37%.
What is the most popular airline from Washington, D.C. to Islip, New York?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Washington, D.C. to Islip, New York is Southwest (100% of total bookings).

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

Compare and see reviews for airlines that fly from Washington, D.C. to Islip, New York with momondo

Airline	Rating	Free Cancellation	Price
Southwest	PriceFrom $221	Free Cancellation	Rating 8.0 4,328 reviews		Search Southwest flights

Montauk

Riverhead

Sag Harbor

Southampton

Amagansett

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Washington, D.C. to Islip. Millions of users trust and use momondo every year so you are in good hands.

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

momondo does allow users to show only those flights to Islip from Washington, D.C. which offer a flexible booking policy as well as other useful filters and features.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Islip from Washington, D.C..

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

Price alerts on flights to Islip from Washington, D.C. are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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Cheap flights from Washington, D.C. to New York from $76

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. to New York departing on 5/16. 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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Southwest flights from Washington, D.C. to Islip, New York

Our best Southwest deals on Washington, D.C. to Islip, New York flight tickets

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

Our best Frontier deals on Washington, D.C. to Islip, New York flight tickets

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

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

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

What is the cheapest airline that flies from Washington, D.C. to Islip Long Island?

What airlines fly to Islip, New York?

How many flights depart from Washington, D.C. to Islip, New York on average per day?

How many flights depart from Washington, D.C. to Islip, New York on average per week?

How long does it take to fly to Islip, New York?

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

Cheap Washington, D.C. to Islip, New York (WAS to ISP) flight deals and tips

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

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Fastest flight time

Direct flights

Airports in Islip, New York

Frequently asked questions about flying from Washington, D.C. to Islip, New York

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

Compare and see reviews for airlines that fly from Washington, D.C. to Islip, New York with momondo

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