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

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

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 December 2025. The most popular departure time for this route is 10:00PM, with 57% of flights per day taking off in the evening.

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

As of December 2025, 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 20% of weekly flights taking off on this day.

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 17m 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 5h 58m.

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 35% 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.

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 December 2025, 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.

$62 Cheap Flights from Washington, D.C. to Islip in 2025/26

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Cheap round-trip flights

Enter your travel dates to find the best prices.

11:30 am - 10:46 pmBWI-ISP

11h 16m1 stop

8:00 am - 12:17 amISP-BWI

16h 17m1 stop

$162Multiple Airlines

Find Deal

Wed, Jan 14 - Sat, Jan 17

9:11 pm - 7:34 pmBWI-ISP

22h 23m1 stop

12:20 pm - 9:05 pmISP-BWI

8h 45m1 stop

$166Frontier

Find Deal

Mon, Dec 15 - Thu, Dec 18

1:00 pm - 8:55 amBWI-ISP

19h 55m2 stops

8:00 am - 12:17 amISP-BWI

16h 17m1 stop

$196Multiple Airlines

Find Deal

Wed, Jan 14 - Sat, Jan 17

6:15 pm - 8:40 amBWI-ISP

14h 25m1 stop

7:53 pm - 10:26 amISP-BWI

14h 33m2 stops

$211Frontier

Find Deal

Sat, Jan 24 - Sun, Jan 25

8:00 am - 11:25 amBWI-ISP

27h 25m2 stops

8:35 pm - 7:22 amISP-BWI

10h 47m1 stop

$213Frontier

Find Deal

Wed, Dec 17 - Sun, Dec 21

8:45 pm - 9:55 pmBWI-ISP

1h 10mnonstop

3:35 pm - 4:55 pmISP-BWI

1h 20mnonstop

$216Southwest

Find Deal

Wed, Jan 14 - Sat, Jan 17

9:26 am - 11:59 pmIAD-ISP

14h 33m1 stop

6:00 am - 9:48 amISP-IAD

27h 48m1 stop

$217Frontier

Find Deal

Mon, Dec 15 - Thu, Dec 18

7:55 am - 2:35 pmDCA-ISP

6h 40m1 stop

2:10 pm - 10:55 pmISP-DCA

8h 45m2 stops

$362Southwest

Find Deal

Thu, Jan 29 - Sun, Feb 1

7:20 am - 2:40 pmDCA-ISP

7h 20m1 stop

6:55 am - 3:55 pmISP-DCA

9h 00m1 stop

$402Southwest

Find Deal

Sat, Dec 27 - Tue, Dec 30

11:40 am - 9:40 pmDCA-ISP

10h 00m1 stop

1:40 pm - 10:50 pmISP-DCA

9h 10m2 stops

$440Southwest

Find Deal

Mon, Dec 15 - Thu, Dec 18

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

Jan 14

BWI8:45 pmBaltimore/Washington

1h 10m

ISP9:55 pmIslip Long Island

Jan 17

ISP3:35 pmIslip Long Island

1h 20m

BWI4:55 pmBaltimore/Washington

$216

Find similar

Southwest

Feb 5

BWI10:45 amBaltimore/Washington

1h 10m

ISP11:55 amIslip Long Island

Feb 5

ISP4:05 pmIslip Long Island

1h 25m

BWI5:30 pmBaltimore/Washington

$247

Find similar

Southwest

Jan 16

BWI3:30 pmBaltimore/Washington

1h 05m

ISP4:35 pmIslip Long Island

Jan 19

ISP11:50 amIslip Long Island

1h 20m

BWI1:10 pmBaltimore/Washington

$278

Find similar

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

Dec 15

BWI9:11 pmBaltimore/Washington

22h 23m

1 stop

ISP7:34 pmIslip Long Island

Dec 18

ISP12:20 pmIslip Long Island

8h 45m

1 stop

BWI9:05 pmBaltimore/Washington

$166

Find similar

Frontier

Dec 12

IAD9:26 amWashington, D.C. Dulles Intl

14h 33m

1 stop

ISP11:59 pmIslip Long Island

Dec 17

ISP12:37 pmIslip Long Island

20h 09m

1 stop

IAD8:46 amWashington, D.C. Dulles Intl

$196

Find similar

Frontier

Jan 24

BWI6:15 pmBaltimore/Washington

14h 25m

1 stop

ISP8:40 amIslip Long Island

Jan 25

ISP7:53 pmIslip Long Island

14h 33m

2 stops

BWI10:26 amBaltimore/Washington

$211

Find similar

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

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Wed 1/14

11:30 am-10:46 pm

1 stop11h 16m

Islip Long Island

Sat 1/17

8:00 am-12:17 am

1 stop16h 17m

$162

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Mon 12/15

9:11 pm-7:34 pm

1 stop22h 23m

Islip Long Island

Thu 12/18

12:20 pm-9:05 pm

1 stop8h 45m

$166

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Wed 1/14

1:00 pm-8:55 am

2 stops19h 55m

Islip Long Island

Sat 1/17

8:00 am-12:17 am

1 stop16h 17m

$196

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Sat 1/24

6:15 pm-8:40 am

1 stop14h 25m

Islip Long Island

Sun 1/25

7:53 pm-10:26 am

2 stops14h 33m

$211

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Wed 12/17

8:00 am-11:25 am

2 stops27h 25m

Islip Long Island

Sun 12/21

8:35 pm-7:22 am

1 stop10h 47m

$213

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Wed 1/14

8:45 pm-9:55 pm

Nonstop1h 10m

Islip Long Island

Sat 1/17

3:35 pm-4:55 pm

Nonstop1h 20m

$216

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Mon 12/15

9:26 am-11:59 pm

1 stop14h 33m

Islip Long Island

Thu 12/18

6:00 am-9:48 am

1 stop27h 48m

$217

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Thu 1/29

7:55 am-2:35 pm

1 stop6h 40m

Islip Long Island

Sun 2/1

2:10 pm-10:55 pm

2 stops8h 45m

$362

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Sat 12/27

7:20 am-2:40 pm

1 stop7h 20m

Islip Long Island

Tue 12/30

6:55 am-3:55 pm

1 stop9h 00m

$402

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Mon 12/15

11:40 am-9:40 pm

1 stop10h 00m

Islip Long Island

Thu 12/18

1:40 pm-10:50 pm

2 stops9h 10m

$440

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

Other information

What is the cheapest month to fly to Islip, New York?

The month of April is, on average, the cheapest month to fly to Islip, New York from Washington, D.C., with most prices found around $285. If you aren’t able to travel to Islip, New York during the month of April, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $320.

What is the cheapest day to depart on your flight to Islip, New York?

The cheapest day to depart from Washington, D.C. to Islip, New York is on a Tuesday. Travelers who choose to depart for Islip, New York on a Tuesday will often find tickets for as low as $296. The most expensive day to fly to Islip, New York is Sunday, with ticket prices averaging around $487.

What is the cheapest time of day to depart on your flight to Islip, New York?

Flying to Islip, New York from Washington, D.C. in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $337 when looking at flights departing in the afternoon. Flights to Islip, New York are more costly in the morning, with an average ticket price of $377. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

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.

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

You could potentially save up to 21% on your flight if you consider stops on a Washington, D.C. to Islip, New York flight.

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	$234
Fastest flight time	1h 10m
Direct flights	Tue, Wed, 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 $234. The best round-trip flight deal from Washington, D.C. to Islip, New York found on momondo in the last 72 hours is $404.

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 Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday. The only airline offering direct flights is Southwest.

There is 1 airport near Islip, New York: Islip Long Island (ISP)

Search flight deals

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 05m, 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 December 2025, 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 737-800 Passenger/BBJ2 (winglets), making up 21.88% of the total bookings. Other popular models include Boeing 737-700 Passenger/BBJ1 (winglets) with 14.06%, Boeing 737 MAX 8 with 8.59%, and Embraer 175 with 7.03%.
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 $231	Free Cancellation	Rating 8.0 4,253 reviews		Search Southwest flights

Montauk

Riverhead

Sag Harbor

Southampton

Amagansett

Why use momondo?

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 $62

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 1/30. 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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Use the filters below to find and compare flights from Washington, D.C. to Islip, New York that are best for you.

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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

What is the cheapest month to fly to Islip, New York?

What is the cheapest day to depart on your flight to Islip, New York?

The cheapest day to depart from Washington, D.C. to Islip, New York is on a Tuesday. Travelers who choose to depart for Islip, New York on a Tuesday will often find tickets for as low as $296. The most expensive day to fly to Islip, New York is Sunday, with ticket prices averaging around $487.

What is the cheapest time of day to depart on your flight to Islip, New York?

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.

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

You could potentially save up to 21% on your flight if you consider stops on a Washington, D.C. to Islip, New York flight.

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

Frontier, Southwest, and JetBlue are the most popular carriers operating 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?

2 flights are operational daily from Washington, D.C. to Islip, New York as of December 2025. The most popular departure time for this route is 10:00PM, with 57% of flights per day taking off in the evening.

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

As of December 2025, 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 20% of weekly flights taking off on this day.

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

Best Price Found

Fastest flight time

Direct flights

Airports in Islip, New York

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

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

How many operators does momondo search 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?

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

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

What is the most popular airline 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

Traveling to a place near New York?

Why use momondo?

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

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

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

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

An easier way to manage your Islip, New York trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

Airports servicing New York