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

Flights from Washington, D.C. to Islip Long Island have been viewed 2 times in the past calendar month.

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

Currently priced at $186, Southwest will fly you from Washington, D.C. to Islip, New York and back. In addition to Southwest, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Frontier and JetBlue - these airlines can fly you to your destination from $251 and $318, respectively. These flights start at 51% lower than the current average price 3 months from now.

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

$89 is the cheapest one-way deal found within the past few days, from Southwest. You may also be able to find cheap deals on Frontier and JetBlue, with prices starting from $138 and $191, respectively.

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

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

What are the most popular routes from Washington, D.C. to Islip, New York?

When deciding which route to take from Washington, D.C. to Islip, New York consider Washington, D.C. Dulles Intl - Islip Long Island, Baltimore/Washington - Islip Long Island or Washington, D.C. Reagan-National - Islip Long Island as they are the most popular.

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

Looking at all options, your cheapest flight can be booked for $123. While the most popular route (Washington, D.C. Dulles Intl - Islip Long Island) can be booked for $343 on average our data indicates $289 when flying from Washington, D.C. to Islip, New York.

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

Users have found that flying from Washington, D.C. to Islip, New York on a Saturday typically leans towards higher prices. However, this doesn’t mean you still can’t find a deal. Flexibility with other aspects of your flight can still land a great price for your trip.

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

Find a great deal and save up to 205% by booking at least 59 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Washington, D.C. to Islip, New York within the next two weeks, with the cheapest ticket starting at $266.

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

Flights from Washington, D.C. to Islip, New York lean towards being more expensive in December. Prices are generally better when you fly from Washington, D.C. to Islip, New York in April, with the cheapest ticket starting at $91.

What airport do you fly into for flights to Islip from 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 Islip from Washington, D.C.. Booking flights from Washington, D.C. to Long Island (ISP) should be relatively easy as there are 0 daily inbound flights from Washington, D.C. from 1 airline.

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

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

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

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

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

Yes. Cheapflights offers flight deals from Washington, D.C. to Islip 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 Washington, D.C. to Islip, NY

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

Round-trip from	$186 (Southwest)
One-way from	$89 (Southwest)
Popular in	January
Cheapest in	April
Average price	$395
Good round-trip deal	$319 or less
Good one-way deal	$171 or less

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

Search Deals

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

Search Deals

Highest demand for flights based on searches. 14% potential increase in price ($66 potential increase over avg. RT price).

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Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).

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Average for round-trip flights in June 2025

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

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

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

Cheapest flights from Washington, D.C. to Islip
Explore the most affordable flight options available from Washington, D.C. to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

Wed 8/202:00 pmBWI - ISP

Nonstop1h 10mSouthwest

Tue 8/266:05 amISP - BWI

Nonstop1h 15mSouthwest

Deal found 6/10

$186

Thu 8/283:26 pmBWI - ISP

1 stop8h 33mFrontier

Tue 9/26:05 amISP - BWI

1 stop8h 03mFrontier

Deal found 6/10

$251

Wed 8/2012:50 pmDCA - ISP

1 stop8h 15mSouthwest

Tue 8/265:30 amISP - DCA

1 stop5h 40mSouthwest

Deal found 6/10

$268

Sat 7/128:12 pmDCA - ISP

1 stop15h 29mJetBlue

Mon 7/1412:55 pmISP - DCA

1 stop22h 05mJetBlue

Deal found 6/12

$318

Fri 7/41:29 pmIAD - ISP

1 stop6h 07mFrontier

Fri 7/118:37 pmISP - IAD

1 stop16h 14mFrontier

Deal found 6/10

$318

Fri 6/271:29 pmIAD - ISP

1 stop6h 07mMultiple Airlines

Sun 6/297:49 pmISP - IAD

1 stop12h 16mMultiple Airlines

Deal found 6/10

$440

Wed 7/96:25 amBWI - ISP

3 stops36h 34mMultiple Airlines

Wed 7/162:55 pmISP - BWI

1 stop25h 43mMultiple Airlines

Deal found 6/11

$528

Thu 8/148:00 pmDCA - ISP

1 stop14h 51mMultiple Airlines

Fri 8/152:19 pmISP - DCA

1 stop18h 20mMultiple Airlines

Deal found 6/9

$566

Thu 7/318:30 amDCA - ISP

1 stop4h 54mAlaska Airlines

Mon 8/44:33 pmISP - DCA

1 stop4h 26mAlaska Airlines

Deal found 6/9

$798

Best flights from Washington, D.C. to Islip
Discover carefully curated flight deals from Washington, D.C. to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 12, 2025.

Wed 8/202:00 pmBWI - ISP

Nonstop1h 10mSouthwest

Tue 8/266:05 amISP - BWI

Nonstop1h 15mSouthwest

Deal found 6/10

$186

Thu 8/283:26 pmBWI - ISP

1 stop8h 33mFrontier

Tue 9/26:05 amISP - BWI

1 stop8h 03mFrontier

Deal found 6/10

$251

Sat 7/128:12 pmDCA - ISP

1 stop15h 29mJetBlue

Mon 7/1412:55 pmISP - DCA

1 stop22h 05mJetBlue

Deal found 6/12

$318

Fri 6/271:29 pmIAD - ISP

1 stop6h 07mMultiple Airlines

Sun 6/297:49 pmISP - IAD

1 stop12h 16mMultiple Airlines

Deal found 6/10

$440

Wed 8/2012:50 pmDCA - ISP

1 stop8h 15mSouthwest

Tue 8/265:30 amISP - DCA

1 stop5h 40mSouthwest

Deal found 6/10

$268

Fri 7/41:29 pmIAD - ISP

1 stop6h 07mFrontier

Fri 7/118:37 pmISP - IAD

1 stop16h 14mFrontier

Deal found 6/10

$318

Thu 7/318:30 amDCA - ISP

1 stop4h 54mAlaska Airlines

Mon 8/44:33 pmISP - DCA

1 stop4h 26mAlaska Airlines

Deal found 6/9

$798

Wed 7/96:25 amBWI - ISP

3 stops36h 34mMultiple Airlines

Wed 7/162:55 pmISP - BWI

1 stop25h 43mMultiple Airlines

Deal found 6/11

$528

Thu 8/148:00 pmDCA - ISP

1 stop14h 51mMultiple Airlines

Fri 8/152:19 pmISP - DCA

1 stop18h 20mMultiple Airlines

Deal found 6/9

$566

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

Wed 6/189:40 pmBWI - ISP

Nonstop1h 15mSouthwest

Sun 6/226:00 amISP - BWI

Nonstop1h 15mSouthwest

Deal found 6/10

$461

Wed 6/188:25 amIAD - ISP

3 stops34h 34mMultiple Airlines

Sun 6/227:39 pmISP - IAD

3 stops25h 30mMultiple Airlines

Deal found 6/12

$1,030

Sat 6/211:35 pmDCA - ISP

1 stop8h 30mSouthwest

Mon 6/305:05 amISP - DCA

1 stop6h 20mSouthwest

Deal found 6/11

$478

Sun 6/226:06 pmIAD - ISP

1 stop19h 00mFrontier

Wed 6/254:45 pmISP - IAD

1 stop24h 36mFrontier

Deal found 6/11

$388

Sun 6/228:30 amBWI - ISP

1 stop28h 36mFrontier

Wed 6/258:21 pmISP - BWI

1 stop19h 22mFrontier

Deal found 6/11

$394

Sun 6/226:17 pmBWI - ISP

2 stops15h 47mMultiple Airlines

Wed 6/252:55 pmISP - BWI

3 stops39h 54mMultiple Airlines

Deal found 6/10

$652

Fri 6/271:29 pmIAD - ISP

1 stop6h 07mMultiple Airlines

Sun 6/297:49 pmISP - IAD

1 stop12h 16mMultiple Airlines

Deal found 6/10

$440

Fri 7/41:29 pmIAD - ISP

1 stop6h 07mFrontier

Fri 7/118:37 pmISP - IAD

1 stop16h 14mFrontier

Deal found 6/10

$318

Wed 7/96:25 amBWI - ISP

3 stops36h 34mMultiple Airlines

Wed 7/162:55 pmISP - BWI

1 stop25h 43mMultiple Airlines

Deal found 6/11

$528

Thu 7/102:59 pmBWI - ISP

1 stop28h 43mFrontier

Wed 7/168:37 pmISP - BWI

1 stop19h 09mFrontier

Deal found 6/9

$271

Sat 7/128:12 pmDCA - ISP

1 stop15h 29mJetBlue

Mon 7/1412:55 pmISP - DCA

1 stop22h 05mJetBlue

Deal found 6/12

$318

Fri 7/258:12 pmDCA - ISP

1 stop14h 39mMultiple Airlines

Fri 8/14:33 pmISP - DCA

1 stop16h 06mMultiple Airlines

Deal found 6/10

$614

One-way flights from Washington, D.C. to Islip
Search for one-way flight options from Washington, D.C. to Islip. Find affordable one-way fares based on user searches. Data last updated June 12, 2025.

Mon 8/48:10 amBWI - ISP

Nonstop1h 15mSouthwest

Deal found 6/10

$89

Thu 9/1110:45 pmBWI - ISP

1 stop11h 52mFrontier

Deal found 6/11

$138

Sat 8/239:33 pmIAD - ISP

1 stop26h 26mFrontier

Deal found 6/12

$147

Sat 7/261:35 pmDCA - ISP

1 stop8h 30mSouthwest

Deal found 6/12

$154

Sun 8/101:16 pmBWI - ISP

1 stop26h 03mMultiple Airlines

Deal found 6/10

$168

Wed 9/179:35 amIAD - ISP

1 stop25h 02mMultiple Airlines

Deal found 6/11

$188

Sat 8/97:00 amDCA - ISP

1 stop8h 13mJetBlue

Deal found 6/12

$191

Sun 7/278:25 amIAD - ISP

1 stop26h 54mBreeze Airways

Deal found 6/12

$302

Thu 8/2810:30 amDCA - ISP

1 stop4h 51mMultiple Airlines

Deal found 6/11

$354

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Wed 8/20

2:00 pm-3:10 pm

Nonstop1h 10m

Islip Long Island

Tue 8/26

6:05 am-7:20 am

Nonstop1h 15m

$186

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Thu 8/28

3:26 pm-11:59 pm

1 stop8h 33m

Islip Long Island

Tue 9/2

6:05 am-2:08 pm

1 stop8h 03m

$251

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Wed 8/20

12:50 pm-9:05 pm

1 stop8h 15m

Islip Long Island

Tue 8/26

5:30 am-11:10 am

1 stop5h 40m

$268

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Sat 7/12

8:12 pm-11:41 am

1 stop15h 29m

Islip Long Island

Mon 7/14

12:55 pm-11:00 am

1 stop22h 05m

$318

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Fri 7/4

1:29 pm-7:36 pm

1 stop6h 07m

Islip Long Island

Fri 7/11

8:37 pm-12:51 pm

1 stop16h 14m

$318

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Fri 6/27

1:29 pm-7:36 pm

1 stop6h 07m

Islip Long Island

Sun 6/29

7:49 pm-8:05 am

1 stop12h 16m

$440

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Wed 7/9

6:25 am-6:59 pm

3 stops36h 34m

Islip Long Island

Wed 7/16

2:55 pm-4:38 pm

1 stop25h 43m

$528

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Thu 8/14

8:00 pm-10:51 am

1 stop14h 51m

Islip Long Island

Fri 8/15

2:19 pm-8:39 am

1 stop18h 20m

$566

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Thu 7/31

8:30 am-1:24 pm

1 stop4h 54m

Islip Long Island

Mon 8/4

4:33 pm-8:59 pm

1 stop4h 26m

$798

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Wed 10/8

3:00 pm-4:05 pm

Nonstop1h 05m

$89

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 18 results

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

Have a flexible travel schedule? Discover the best time to fly to Islip from Washington, D.C. 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 Washington, D.C. to Islip

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

Currently, January is the cheapest month in which you can book a flight from Washington, D.C. to Islip, New York (average of $108). Flying from Washington, D.C. to Islip, New York in November is currently the most expensive (average of $213). 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 WAS to ISP?

When flying from Washington, D.C. to Islip, New York, the time of day you fly usually plays a role in the price. Save by searching for a flight at noon, which can drop the price by up to 11% versus a flight in the morning.

Rainfall in Islip by month

In terms of precipitation, rainfall in Islip, New York ranges from 3.3 - 4.4 inches per month. March is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Islip, New York when rainfall is around 3.3 in.

Temperature in Islip by month

If weather is an important factor for your trip to Islip, New York, 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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

Reviews of airlines servicing Islip

Peruse reviews from past customers who have flown with Breeze Airways, Alaska Airlines and Southwest from Washington, D.C. to Islip to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Breeze Airways

8.1

Very good

178 reviews

Reviews

1 / 11

10.0

Excellent

Dena,Dec 2024

LAS - BDL

It was comfortable and the crew was great! A few free snacks offered would be nice!

Breeze Airways

8.1

Very good

178 reviews

Breeze Airways

8.1

Very good

178 reviews

Reviews

1 / 11

10.0

Excellent

Dena,Dec 2024

LAS - BDL

It was comfortable and the crew was great! A few free snacks offered would be nice!

Alaska Airlines

8.0

Very good

10,000 reviews

Breeze Airways

8.1

Very good

178 reviews

Reviews

1 / 11

10.0

Excellent

Dena,Dec 2024

LAS - BDL

It was comfortable and the crew was great! A few free snacks offered would be nice!

Southwest

8.0

Very good

4,287 reviews

Breeze Airways

8.1

Very good

178 reviews

Reviews

1 / 11

10.0

Excellent

Dena,Dec 2024

LAS - BDL

It was comfortable and the crew was great! A few free snacks offered would be nice!

JetBlue

7.3

Good

2,925 reviews

Breeze Airways

8.1

Very good

178 reviews

Reviews

1 / 11

10.0

Excellent

Dena,Dec 2024

LAS - BDL

It was comfortable and the crew was great! A few free snacks offered would be nice!

Frontier

6.0

Okay

3,295 reviews

Breeze Airways

8.1

Very good

178 reviews

Reviews

1 / 11

10.0

Excellent

Dena,Dec 2024

LAS - BDL

It was comfortable and the crew was great! A few free snacks offered would be nice!

Related info for your journey

What airport do you fly into for flights to Islip from 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 Islip from Washington, D.C.. Booking flights from Washington, D.C. to Long Island (ISP) should be relatively easy as there are 0 daily inbound flights from Washington, D.C. from 1 airline.
How popular is this Washington, D.C. to Islip, New York flight route?
Flights from Washington, D.C. to Islip Long Island have been viewed 2 times in the past calendar month.
What are the cheapest airlines flying from Washington, D.C. to Islip, New York round-trip?
Currently priced at $186, Southwest will fly you from Washington, D.C. to Islip, New York and back. In addition to Southwest, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Frontier and JetBlue - these airlines can fly you to your destination from $251 and $318, respectively. These flights start at 51% lower than the current average price 3 months from now.
What are the cheapest airlines to fly from Washington, D.C. to Islip, New York one-way?
$89 is the cheapest one-way deal found within the past few days, from Southwest. You may also be able to find cheap deals on Frontier and JetBlue, with prices starting from $138 and $191, respectively.
What are the most popular routes from Washington, D.C. to Islip, New York?
When deciding which route to take from Washington, D.C. to Islip, New York consider Washington, D.C. Dulles Intl - Islip Long Island, Baltimore/Washington - Islip Long Island or Washington, D.C. Reagan-National - Islip Long Island as they are the most popular.
What are the cheapest flights from Washington, D.C. to Islip, New York?
Looking at all options, your cheapest flight can be booked for $123. While the most popular route (Washington, D.C. Dulles Intl - Islip Long Island) can be booked for $343 on average our data indicates $289 when flying from Washington, D.C. to Islip, New York.
Can I find deals for flights from Washington, D.C. to Islip that include hotel bookings?
Yes. In addition to deals on Washington, D.C. to Islip flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Washington, D.C. to Islip?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington, D.C. to Islip.
Can I find deals for business class flights from Washington, D.C. to Islip?
Yes. Cheapflights offers flight deals from Washington, D.C. to Islip 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 Washington, D.C. to Islip, New York?
Currently, January is the cheapest month in which you can book a flight from Washington, D.C. to Islip, New York (average of $108). Flying from Washington, D.C. to Islip, New York in November is currently the most expensive (average of $213). 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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Alternative routes for Washington, D.C. to Islip

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Other flights to Islip

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

Airline	Cheapest	Average	Flexibility	On-time
Southwest	Cheapest$250	Average$349	FlexibilityNo cancel fee	On-time63%

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

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 8/4. Fares are subject to change and may not be available on all flights or dates of travel.

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

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

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

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

Cheapest flights from Washington, D.C. to IslipExplore the most affordable flight options available from Washington, D.C. to Islip. 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 Washington, D.C. to Islip. 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 Washington, D.C. to Islip that are best for you.

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

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

Cheapflights Insights

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

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

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

Find hourly flight availability from Washington, D.C. to Islip. 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 Islip by month

Plan your trip to Islip by taking into account the average rainfall totals by month.

Temperature in Islip by month

Plan your trip to Islip by taking into account the average temperature totals by month.

Reviews of airlines servicing Islip

Get insights into the airlines that provide service to Islip. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Islip. Reviews last updated June 12, 2025.

Peruse reviews from past customers who have flown with Breeze Airways, Alaska Airlines and Southwest from Washington, D.C. to Islip to help guide your decision. 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 Washington, D.C. to Islip. 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 into for flights to Islip from Washington, D.C.?

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

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

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

What are the most popular routes from Washington, D.C. to Islip, New York?

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

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

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

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Cheapest flights from Washington, D.C. to Islip
Explore the most affordable flight options available from Washington, D.C. to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.