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 6 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 Frontier ($266) 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 55% less than the average price by searching for these airlines.

What are the cheapest airlines to fly from Islip, New York to Washington, D.C. one-way?

To fly one-way, consider booking your trip with Southwest, which is currently one of the cheapest options available, starting at $89. JetBlue flights start at $127 while deals on Frontier start at $129 one-way.

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.

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

On average you can expect to pay $306 for a flight from Islip, New York to Washington, D.C.. The cheapest flight overall is $127 while the most popular route, (Islip Long Island - Washington, D.C. Reagan-National) is currently priced at $255.

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 32 days before your planned departure. Booking around this time can save you about 156% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $298 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 $234 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 27% 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	$347
Good round-trip deal	$324 or less
Good one-way deal	$187 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. 2% potential increase in price ($9 potential increase over avg. RT price).

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Cheapest flight prices on average. 5% potential price decrease ($23 potential savings vs. average RT price).

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Average for round-trip flights in June 2025

Search Deals

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

Search Deals

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 June 12, 2025.

Sat 10/411:55 amISP - BWI

Nonstop1h 15mSouthwest

Mon 10/63:45 pmBWI - ISP

Nonstop1h 05mSouthwest

Deal found 6/12

$186

Wed 9/34:00 pmISP - DCA

1 stop6h 00mSouthwest

Wed 9/176:55 amDCA - ISP

1 stop6h 20mSouthwest

Deal found 6/10

$255

Sat 10/45:05 pmISP - BWI

1 stop28h 43mFrontier

Mon 10/64:32 pmBWI - ISP

1 stop24h 05mFrontier

Deal found 6/12

$266

Wed 7/162:55 pmISP - BWI

1 stop25h 43mMultiple Airlines

Sat 7/194:25 pmBWI - ISP

3 stops26h 34mMultiple Airlines

Deal found 6/12

$461

Thu 8/147:30 amISP - DCA

1 stop7h 15mMultiple Airlines

Mon 8/188:00 pmDCA - ISP

1 stop15h 41mMultiple Airlines

Deal found 6/10

$550

Fri 6/131:21 pmISP - DCA

1 stop7h 38mJetBlue

Sun 6/157:00 amDCA - ISP

1 stop6h 43mJetBlue

Deal found 6/10

$840

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 June 12, 2025.

Sat 10/411:55 amISP - BWI

Nonstop1h 15mSouthwest

Mon 10/63:45 pmBWI - ISP

Nonstop1h 05mSouthwest

Deal found 6/12

$186

Sat 10/45:05 pmISP - BWI

1 stop28h 43mFrontier

Mon 10/64:32 pmBWI - ISP

1 stop24h 05mFrontier

Deal found 6/12

$266

Wed 7/162:55 pmISP - BWI

1 stop25h 43mMultiple Airlines

Sat 7/194:25 pmBWI - ISP

3 stops26h 34mMultiple Airlines

Deal found 6/12

$461

Wed 9/34:00 pmISP - DCA

1 stop6h 00mSouthwest

Wed 9/176:55 amDCA - ISP

1 stop6h 20mSouthwest

Deal found 6/10

$255

Thu 8/147:30 amISP - DCA

1 stop7h 15mMultiple Airlines

Mon 8/188:00 pmDCA - ISP

1 stop15h 41mMultiple Airlines

Deal found 6/10

$550

Last-minute flights from Islip to Washington, D.C.
Discover last-minute flight deals from Islip to Washington, D.C.. Data last updated June 12, 2025 and is based on user searches.

Fri 6/131:21 pmISP - DCA

1 stop7h 38mJetBlue

Sun 6/157:00 amDCA - ISP

1 stop6h 43mJetBlue

Deal found 6/10

$840

Thu 6/198:21 pmISP - BWI

2 stops15h 02mFrontier

Sun 6/224:28 pmBWI - ISP

2 stops20h 38mFrontier

Deal found 6/12

$388

Sat 6/216:30 amISP - DCA

1 stop7h 55mSouthwest

Sun 6/2211:35 amDCA - ISP

1 stop5h 45mSouthwest

Deal found 6/11

$527

Sun 6/226:00 amISP - BWI

Nonstop1h 15mSouthwest

Tue 6/243:50 pmBWI - ISP

Nonstop1h 10mSouthwest

Deal found 6/10

$406

Sun 6/227:39 pmISP - BWI

2 stops26h 29mMultiple Airlines

Tue 6/2410:23 amBWI - ISP

3 stops27h 09mMultiple Airlines

Deal found 6/10

$736

Tue 7/87:30 amISP - DCA

1 stop5h 24mMultiple Airlines

Tue 7/157:00 amDCA - ISP

1 stop28h 41mMultiple Airlines

Deal found 6/10

$569

Wed 7/162:55 pmISP - BWI

1 stop25h 43mMultiple Airlines

Sat 7/194:25 pmBWI - ISP

3 stops26h 34mMultiple Airlines

Deal found 6/12

$461

Thu 7/245:05 amISP - DCA

1 stop6h 20mSouthwest

Sun 7/276:55 amDCA - ISP

2 stops10h 25mSouthwest

Deal found 6/12

$332

Thu 7/316:00 amISP - BWI

Nonstop1h 15mSouthwest

Tue 8/510:45 amBWI - ISP

Nonstop1h 10mSouthwest

Deal found 6/12

$248

Thu 7/316:00 amISP - BWI

1 stop9h 46mFrontier

Tue 8/58:00 amBWI - ISP

1 stop7h 42mFrontier

Deal found 6/12

$298

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 June 12, 2025.

Wed 8/206:05 amISP - BWI

Nonstop1h 15mSouthwest

Deal found 6/10

$89

Sat 7/1211:40 amISP - DCA

1 stop9h 19mJetBlue

Deal found 6/11

$127

Fri 7/118:37 pmISP - BWI

1 stop12h 56mFrontier

Deal found 6/12

$129

Tue 7/156:25 amISP - DCA

2 stops7h 55mSouthwest

Deal found 6/10

$169

Mon 9/82:25 pmISP - BWI

2 stops33h 52mMultiple Airlines

Deal found 6/11

$224

Mon 7/214:33 pmISP - DCA

2 stops21h 49mMultiple Airlines

Deal found 6/11

$373

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 10/4

11:55 am-1:10 pm

Nonstop1h 15m

Baltimore/Washington

Mon 10/6

3:45 pm-4:50 pm

Nonstop1h 05m

$186

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 9/3

4:00 pm-10:00 pm

1 stop6h 00m

Washington, D.C. Reagan-National

Wed 9/17

6:55 am-1:15 pm

1 stop6h 20m

$255

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Sat 10/4

5:05 pm-9:48 pm

1 stop28h 43m

Baltimore/Washington

Mon 10/6

4:32 pm-4:37 pm

1 stop24h 05m

$266

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Wed 7/16

2:55 pm-4:38 pm

1 stop25h 43m

Baltimore/Washington

Sat 7/19

4:25 pm-6:59 pm

3 stops26h 34m

$461

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Thu 8/14

7:30 am-2:45 pm

1 stop7h 15m

Washington, D.C. Reagan-National

Mon 8/18

8:00 pm-11:41 am

1 stop15h 41m

$550

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Wed 8/20

6:05 am-7:20 am

Nonstop1h 15m

$89

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sat 7/12

11:40 am-8:59 pm

1 stop9h 19m

$127

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Fri 7/11

8:37 pm-9:33 am

1 stop12h 56m

$129

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Tue 7/15

6:25 am-2:20 pm

2 stops7h 55m

$169

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Mon 9/8

2:25 pm-12:17 am

2 stops33h 52m

$224

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 11 results

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.

Rainfall in Washington, D.C. by month

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.

Temperature in Washington, D.C. by month

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).

Reviews of airlines servicing Washington, D.C.

Get a feel of what it's like to fly with Southwest, JetBlue and Frontier from Islip to Washington, D.C. by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.0

Very good

4,287 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Southwest

8.0

Very good

4,287 reviews

Southwest

8.0

Very good

4,287 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

JetBlue

7.3

Good

2,925 reviews

Southwest

8.0

Very good

4,287 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Frontier

5.9

Fair

3,295 reviews

Southwest

8.0

Very good

4,287 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

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 6 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 Frontier ($266) 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 55% less than the average price by searching for these airlines.
What are the cheapest airlines to fly from Islip, New York to Washington, D.C. one-way?
To fly one-way, consider booking your trip with Southwest, which is currently one of the cheapest options available, starting at $89. JetBlue flights start at $127 while deals on Frontier start at $129 one-way.
What are the cheapest flights from Islip, New York to Washington, D.C.?
On average you can expect to pay $306 for a flight from Islip, New York to Washington, D.C.. The cheapest flight overall is $127 while the most popular route, (Islip Long Island - Washington, D.C. Reagan-National) is currently priced at $255.
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

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Woodbridge

Tysons

Silver Spring

Linthicum Heights

Fredericksburg

Gaithersburg

Fairfax

Falls Church

Easton

Herndon

Towson

Bowie

Rockville

Reston

National Harbor

Springfield

Manassas

Dundalk

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

Airline	Cheapest	Average	Flexibility	On-time
Southwest	Cheapest$269	Average$346	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 8/20. 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

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

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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 June 12, 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 June 12, 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 June 12, 2025.

Rainfall in Washington, D.C. by month

Plan your trip to Washington, D.C. by taking into account the average rainfall totals by month.

Temperature in Washington, D.C. by month

Plan your trip to Washington, D.C. by taking into account the average temperature totals by month.

Reviews of airlines servicing Washington, D.C.

Get a feel of what it's like to fly with Southwest, JetBlue and Frontier from Islip to Washington, D.C. by reading reviews from past customers. You can also see how each airline stacks up 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 airlines to fly from Islip, New York to Washington, D.C. one-way?

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 Islip?

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Alternative routes for Islip to Washington, D.C.

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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 June 12, 2025.