How popular is this Islip, New York to Washington, D.C. flight route?

This flight path from Islip Long Island to Washington, D.C. was viewed by 10 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

What are the cheapest airlines flying from Islip, New York to Washington, D.C. round-trip?

According to our current data, Southwest ($186), and JetBlue ($279) offers the cheapest pricing from Islip, New York to Washington, D.C.. You may be able to fly from Islip, New York to Washington, D.C. for 57% less than the average price by searching for these airlines.

What is the cheapest day to fly from Islip, New York to Washington, D.C.?

Travelers seeking maximum savings on their Islip, New York to Washington, D.C. flight should consider departing on Wednesday mornings when fares are most often at their lowest. Wednesday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

In terms of precipitation, rainfall in Washington, D.C. ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. when rainfall is around 2.6 in.

If weather is an important factor for your trip to Washington, D.C., use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

What are the cheapest flights from Islip, New York to Washington, D.C.?

On average you can expect to pay $354 for a flight from Islip, New York to Washington, D.C.. The cheapest flight overall is $93 while the most popular route, (Islip Long Island - Baltimore/Washington) is currently priced at $186.

What is the cheapest day to fly round-trip from Islip, New York to Washington, D.C.?

Thursday is generally a great day to depart. Flying on this day could help you save up to 40%.

How far in advance should I book a flight from Islip, New York to Washington, D.C.?

To save on the cost of your flight from Islip, New York to Washington, D.C., book at least 27 days before your planned departure. Booking around this time can save you about 188% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $308 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $451.

What is the cheapest month to fly from Islip, New York to Washington, D.C.?

April is one of the best times of the year to fly to Washington, D.C. from Islip, New York. Prices for April average $229 per person but you can even find prices for as low as $91. The most expensive prices can be found in the month of December. Opting for a April flight can save you 29% on your journey compared to booking in December

What airport do you fly from for flights from Islip to Washington, D.C.?

Located just 7.2 mi from the city center, Islip Long Island is the airport most travelers will use when flying to Washington, D.C. from Islip. Booking flights from Long Island (ISP) to Washington, D.C. should be relatively easy as there are 0 daily outbound flights to Washington, D.C. from 1 airline.

Can I find deals for flights from Islip to Washington, D.C. that include hotel bookings?

Yes. In addition to deals on Islip to Washington, D.C. flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Islip to Washington, D.C.?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to Washington, D.C..

Can I find deals for business class flights from Islip to Washington, D.C.?

Yes. Cheapflights offers flight deals from Islip to Washington, D.C. by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$89+ Flights from Islip, NY to Washington, D.C.

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Cheap flight deals from Islip to Washington, D.C.

Round-trip from	$186 (Southwest)
One-way from	$89 (Southwest)
Popular in	August
Cheapest in	May
Average price	$531
Good round-trip deal	$327 or less
Good one-way deal	$190 or less

From Islip Long Island to Washington, D.C. (WAS)

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One-way flight from Islip Long Island to Washington, D.C. (WAS)

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Highest demand for flights based on searches. 13% potential increase in price ($65 potential increase over avg. RT price).

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Cheapest flight prices on average. 4% potential price decrease ($21 potential savings vs. average RT price).

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Average for round-trip flights in July 2025

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Price to beat on a round-trip flight from Islip Long Island to Washington, D.C. (WAS).

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Price to beat on a one-way flight from Islip Long Island to Washington, D.C. (WAS).

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Find flight deals from Islip to Washington, D.C.

Cheapest flights from Islip to Washington, D.C.
Explore the most affordable flight options available from Islip to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 30, 2025.

Sat 9/65:40 amISP - BWI

Nonstop1h 15mSouthwest

Mon 9/89:45 pmBWI - ISP

Nonstop1h 10mSouthwest

Deal found 7/29

$186

Wed 8/274:00 pmISP - DCA

1 stop6h 00mSouthwest

Wed 9/36:55 amDCA - ISP

1 stop6h 20mSouthwest

Deal found 7/30

$197

Sat 9/611:35 amISP - DCA

1 stop9h 19mJetBlue

Mon 9/86:19 amDCA - ISP

2 stops9h 04mJetBlue

Deal found 7/28

$279

Mon 8/2510:44 amISP - BWI

3 stops12h 15mMultiple Airlines

Wed 8/275:11 pmBWI - ISP

3 stops25h 48mMultiple Airlines

Deal found 7/29

$596

Sat 9/67:30 amISP - DCA

2 stops7h 52mMultiple Airlines

Mon 9/85:27 pmDCA - ISP

2 stops17h 31mMultiple Airlines

Deal found 7/28

$725

Best flights from Islip to Washington, D.C.
Discover carefully curated flight deals from Islip to Washington, D.C. that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 30, 2025.

Sat 9/65:40 amISP - BWI

Nonstop1h 15mSouthwest

Mon 9/89:45 pmBWI - ISP

Nonstop1h 10mSouthwest

Deal found 7/29

$186

Sat 9/611:35 amISP - DCA

1 stop9h 19mJetBlue

Mon 9/86:19 amDCA - ISP

2 stops9h 04mJetBlue

Deal found 7/28

$279

Wed 8/274:00 pmISP - DCA

1 stop6h 00mSouthwest

Wed 9/36:55 amDCA - ISP

1 stop6h 20mSouthwest

Deal found 7/30

$197

Mon 8/2510:44 amISP - BWI

3 stops12h 15mMultiple Airlines

Wed 8/275:11 pmBWI - ISP

3 stops25h 48mMultiple Airlines

Deal found 7/29

$596

Sat 9/67:30 amISP - DCA

2 stops7h 52mMultiple Airlines

Mon 9/85:27 pmDCA - ISP

2 stops17h 31mMultiple Airlines

Deal found 7/28

$725

Last-minute flights from Islip to Washington, D.C.
Discover last-minute flight deals from Islip to Washington, D.C.. Data last updated July 30, 2025 and is based on user searches.

Mon 8/45:05 amISP - DCA

1 stop6h 20mSouthwest

Mon 8/116:55 amDCA - ISP

1 stop8h 40mSouthwest

Deal found 7/29

$587

Tue 8/56:05 amISP - BWI

Nonstop1h 15mSouthwest

Tue 8/122:00 pmBWI - ISP

Nonstop1h 10mSouthwest

Deal found 7/29

$406

Fri 8/810:44 amISP - BWI

2 stops13h 29mMultiple Airlines

Sun 8/108:25 amBWI - ISP

3 stops25h 39mMultiple Airlines

Deal found 7/28

$639

Fri 8/87:30 amISP - DCA

2 stops9h 58mMultiple Airlines

Sun 8/101:00 pmDCA - ISP

2 stops7h 01mMultiple Airlines

Deal found 7/28

$1,097

Mon 8/2510:44 amISP - BWI

3 stops12h 15mMultiple Airlines

Wed 8/275:11 pmBWI - ISP

3 stops25h 48mMultiple Airlines

Deal found 7/29

$596

Wed 8/274:00 pmISP - DCA

1 stop6h 00mSouthwest

Wed 9/36:55 amDCA - ISP

1 stop6h 20mSouthwest

Deal found 7/30

$197

Fri 8/293:05 pmISP - BWI

Nonstop1h 15mSouthwest

Fri 9/53:20 pmBWI - ISP

Nonstop1h 10mSouthwest

Deal found 7/30

$247

One-way flights from Islip to Washington, D.C.
Search for one-way flight options from Islip to Washington, D.C.. Find affordable one-way fares based on user searches. Data last updated July 30, 2025.

Tue 10/284:55 pmISP - BWI

Nonstop1h 15mSouthwest

Deal found 7/29

$89

Wed 8/274:00 pmISP - DCA

1 stop6h 00mSouthwest

Deal found 7/28

$99

Fri 9/1211:35 amISP - DCA

1 stop9h 19mJetBlue

Deal found 7/28

$118

Thu 11/611:40 amISP - BWI

2 stops12h 49mMultiple Airlines

Deal found 7/28

$211

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Sat 9/6

5:40 am-6:55 am

Nonstop1h 15m

Baltimore/Washington

Mon 9/8

9:45 pm-10:55 pm

Nonstop1h 10m

$186

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 8/27

4:00 pm-10:00 pm

1 stop6h 00m

Washington, D.C. Reagan-National

Wed 9/3

6:55 am-1:15 pm

1 stop6h 20m

$197

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sat 9/6

11:35 am-8:54 pm

1 stop9h 19m

Washington, D.C. Reagan-National

Mon 9/8

6:19 am-3:23 pm

2 stops9h 04m

$279

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Mon 8/25

10:44 am-10:59 pm

3 stops12h 15m

Baltimore/Washington

Wed 8/27

5:11 pm-6:59 pm

3 stops25h 48m

$596

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sat 9/6

7:30 am-3:22 pm

2 stops7h 52m

Washington, D.C. Reagan-National

Mon 9/8

5:27 pm-10:58 am

2 stops17h 31m

$725

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Tue 10/28

4:55 pm-6:10 pm

Nonstop1h 15m

$89

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 8/27

4:00 pm-10:00 pm

1 stop6h 00m

$99

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 9/12

11:35 am-8:54 pm

1 stop9h 19m

$118

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Thu 11/6

11:40 am-12:29 am

2 stops12h 49m

$211

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Best time to book a flight from Islip to Washington, D.C.

Have a flexible travel schedule? Discover the best time to fly to Washington, D.C. from Islip with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Islip to Washington, D.C.

What is the cheapest month to book a flight from Islip, New York to Washington, D.C.?

Currently, August is the cheapest month in which you can book a flight from Islip, New York to Washington, D.C. (average of $241). Flying from Islip, New York to Washington, D.C. in March is currently the most expensive (average of $290). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ISP to WAS?

When flying from Islip, New York to Washington, D.C., the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 26% versus a flight in the morning.

Reviews of airlines servicing Washington, D.C.

Get a feel of what it's like to fly with Southwest and JetBlue from Islip to Washington, D.C. by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.0

Very good

4,241 reviews

Reviews

1 / 20

8.0

Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

Southwest

8.0

Very good

4,241 reviews

Southwest

8.0

Very good

4,241 reviews

Reviews

1 / 20

8.0

Excellent

Gina,Jul 2025

LAS - DEN

JetBlue

7.3

Good

2,913 reviews

Southwest

8.0

Very good

4,241 reviews

Reviews

1 / 20

8.0

Excellent

Gina,Jul 2025

LAS - DEN

Related info for your journey

What airport do you fly from for flights from Islip to Washington, D.C.?
Located just 7.2 mi from the city center, Islip Long Island is the airport most travelers will use when flying to Washington, D.C. from Islip. Booking flights from Long Island (ISP) to Washington, D.C. should be relatively easy as there are 0 daily outbound flights to Washington, D.C. from 1 airline.
How popular is this Islip, New York to Washington, D.C. flight route?
This flight path from Islip Long Island to Washington, D.C. was viewed by 10 users in the past month. Keep an eye out for changes in search interest prior to high and low season.
What are the cheapest airlines flying from Islip, New York to Washington, D.C. round-trip?
According to our current data, Southwest ($186), and JetBlue ($279) offers the cheapest pricing from Islip, New York to Washington, D.C.. You may be able to fly from Islip, New York to Washington, D.C. for 57% less than the average price by searching for these airlines.
What are the cheapest flights from Islip, New York to Washington, D.C.?
On average you can expect to pay $354 for a flight from Islip, New York to Washington, D.C.. The cheapest flight overall is $93 while the most popular route, (Islip Long Island - Baltimore/Washington) is currently priced at $186.
Can I find deals for flights from Islip to Washington, D.C. that include hotel bookings?
Yes. In addition to deals on Islip to Washington, D.C. flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Islip to Washington, D.C.?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to Washington, D.C..
Can I find deals for business class flights from Islip to Washington, D.C.?
Yes. Cheapflights offers flight deals from Islip to Washington, D.C. by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Islip, New York to Washington, D.C.?
Currently, August is the cheapest month in which you can book a flight from Islip, New York to Washington, D.C. (average of $241). Flying from Islip, New York to Washington, D.C. in March is currently the most expensive (average of $290). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Woodbridge

Arlington

Alexandria

Tysons

Silver Spring

Fredericksburg

Gaithersburg

Towson

Linthicum Heights

Easton

Fairfax

Manassas

Falls Church

Waldorf

Laurel

Rockville

Oxon Hill

National Harbor

Dundalk

Bowie

Browse thousands of different options on Cheapflights for your next trip

Top airline flying from Islip to Washington, D.C.

Airline	Cheapest	Average	Flexibility	On-time
Southwest	Cheapest$273	Average$351	FlexibilityNo cancel fee	On-time63%

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$89+ Cheap flights from Islip, NY (ISP) to Washington, D.C. (WAS)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/28. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Islip to Washington, D.C. with Cheapflights

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2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Islip to Washington, D.C.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Islip to Washington, D.C.

Cheapest flights from Islip to Washington, D.C.Explore the most affordable flight options available from Islip to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 30, 2025.

Explore the most affordable flight options available from Islip to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 30, 2025.

Cheapflights Fare Finder

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

Best time to book a flight from Islip to Washington, D.C.

Have a flexible travel schedule? Discover the best time to fly to Washington, D.C. from Islip with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Islip to Washington, D.C.

What is the cheapest month to book a flight from Islip, New York to Washington, D.C.?

What is the cheapest time of day to fly from ISP to WAS?

Find hourly flight availability from Islip to Washington, D.C.. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 30, 2025.

Reviews of airlines servicing Washington, D.C.

Get a feel of what it's like to fly with Southwest and JetBlue from Islip to Washington, D.C. by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Islip to Washington, D.C.. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly from for flights from Islip to Washington, D.C.?

How popular is this Islip, New York to Washington, D.C. flight route?

What are the cheapest airlines flying from Islip, New York to Washington, D.C. round-trip?

What are the cheapest flights from Islip, New York to Washington, D.C.?

Can I find deals for flights from Islip to Washington, D.C. that include hotel bookings?

How can I find direct flights from Islip to Washington, D.C.?

Can I find deals for business class flights from Islip to Washington, D.C.?

What is the cheapest month to book a flight from Islip, New York to Washington, D.C.?

Traveling to a place near Washington, D.C.?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Islip to Washington, D.C.

See prices for flight routes from nearby airports that may be better suited for you.

Top airline flying from Islip to Washington, D.C.

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Cheapest flights from Islip to Washington, D.C.
Explore the most affordable flight options available from Islip to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 30, 2025.