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Washington, D.C.

$68+ 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 1/13. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — WAS
ene. 14 — ene. 211
mié. 1/14
mié. 1/21
1 adult, Economy
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Cheap 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 diciembre 15, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 12/218:35 pmISP - BWI
1 stop10h 47mFrontier
mié. 12/248:18 pmBWI - ISP
2 stops15h 07mFrontier
Deal found 12/15$396
This Kiwi.com deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/1510:19 amISP - BWI
1 stop9h 57mFrontier
lun. 12/228:18 pmBWI - ISP
2 stops15h 07mFrontier
Deal found 12/14$401
This Kiwi.com deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 12/206:40 pmISP - BWI
1 stop12h 38mFrontier
dom. 12/215:36 pmBWI - ISP
2 stops26h 04mFrontier
Deal found 12/15$408
This Kiwi.com deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/1510:19 amISP - BWI
1 stop9h 57mFrontier
dom. 12/215:36 pmBWI - ISP
2 stops19h 33mFrontier
Deal found 12/14$422
This Kiwi.com deal was found by Cheapflights users on 12/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/198:35 pmISP - BWI
1 stop11h 54mMultiple Airlines
dom. 12/215:36 pmBWI - ISP
2 stops26h 04mMultiple Airlines
Deal found 12/13$423
This Kiwi.com deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 12/206:40 pmISP - BWI
1 stop13h 49mMultiple Airlines
dom. 12/2110:00 pmBWI - ISP
1 stop21h 40mMultiple Airlines
Deal found 12/15$433
This Kiwi.com deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 12/288:35 pmISP - BWI
1 stop10h 47mFrontier
mar. 12/305:36 pmBWI - ISP
2 stops28h 41mFrontier
Deal found 12/15$446
This Kiwi.com deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/302:19 pmISP - BWI
2 stops18h 10mMultiple Airlines
sáb. 1/310:00 pmBWI - ISP
1 stop15h 09mMultiple Airlines
Deal found 12/15$477
This Kiwi.com deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 12/288:35 pmISP - BWI
1 stop10h 47mMultiple Airlines
mar. 12/309:09 pmBWI - ISP
1 stop19h 28mMultiple Airlines
Deal found 12/15$494
This Southwest deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 12/212:45 pmISP - DCA
2 stops8h 05mSouthwest
mié. 12/246:55 amDCA - ISP
1 stop5h 35mSouthwest
Deal found 12/15$667
This Southwest deal was found by Cheapflights users on 12/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/153:40 pmISP - DCA
1 stop7h 10mSouthwest
mar. 12/166:55 amDCA - ISP
1 stop5h 35mSouthwest
Deal found 12/13$717
This Southwest deal was found by Cheapflights users on 12/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/176:15 amISP - DCA
2 stops11h 10mSouthwest
vie. 12/197:30 amDCA - ISP
1 stop9h 35mSouthwest
Deal found 12/13$728

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

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to Washington, D.C. (WAS). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated diciembre 15, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$264
(Kiwi.com)

One-way from

$68
(Kiwi.com)

Popular in

July

Cheapest in

May

Average price

$534

Good round-trip deal

$310 or less

Good one-way deal

$179 or less
Provider with most accurate pricing for Islip Long Island-Washington, D.C. (WAS) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Islip Long Island-Washington, D.C. (WAS) flights.
Search Deals
From Islip Long Island to Washington, D.C. (WAS)
Search Deals
One-way flight from Islip Long Island to Washington, D.C. (WAS)
Search Deals
Highest demand for flights based on searches. 20% potential increase in price ($130 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 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).
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to Washington, D.C. that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated diciembre 15, 2025.
Use the filters below to find and compare flights from Islip to Washington, D.C. that are best for you.

Fly from

Islip

Fly to

Washington, D.C.

Route

Depart

Return

Price

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

lun. 2/16

2:31 pm-5:13 pm

2 stops26h 42m

Baltimore/Washington

mar. 2/24

7:54 pm-1:13 pm

1 stop17h 19m

$264

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

vie. 1/23

2:01 pm-11:47 pm

2 stops9h 46m

Baltimore/Washington

sáb. 1/24

6:15 pm-8:40 am

1 stop14h 25m

$273

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

lun. 2/16

5:35 pm-6:55 pm

Nonstop1h 20m

Baltimore/Washington

mar. 2/24

8:45 pm-9:55 pm

Nonstop1h 10m

$310

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

vie. 1/23

12:40 pm-2:05 pm

Nonstop1h 25m

Baltimore/Washington

sáb. 1/24

2:15 pm-3:25 pm

Nonstop1h 10m

$339

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

mié. 1/7

9:15 am-3:45 pm

1 stop6h 30m

Washington, D.C. Reagan-National

jue. 1/15

7:30 am-1:30 pm

1 stop6h 00m

$367

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

vie. 4/3

5:55 pm-7:15 pm

Nonstop1h 20m

Baltimore/Washington

dom. 4/5

10:40 pm-11:50 pm

Nonstop1h 10m

$379

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

vie. 1/2

5:40 am-7:00 am

Nonstop1h 20m

Baltimore/Washington

vie. 1/9

10:45 am-11:55 am

Nonstop1h 10m

$415

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

vie. 1/2

5:40 am-7:00 am

Nonstop1h 20m

Baltimore/Washington

lun. 1/5

3:45 pm-4:55 pm

Nonstop1h 10m

$415

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

vie. 1/2

8:35 pm-7:22 am

1 stop10h 47m

Baltimore/Washington

vie. 1/9

4:44 pm-7:08 pm

1 stop26h 24m

$417

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

vie. 1/16

2:10 pm-10:55 pm

2 stops8h 45m

Washington, D.C. Reagan-National

lun. 1/19

7:30 am-1:30 pm

1 stop6h 00m

$418

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/15

Showing 1-10 of 27 results
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Compare providers for flights from Islip to Washington, D.C.

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Islip to Washington, D.C. in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Islip, New York-Washington, D.C. flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Islip, New York-Washington, D.C. flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Islip, New York-Washington, D.C. flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Islip, New York-Washington, D.C. flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Islip, New York-Washington, D.C. flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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, March is the cheapest month in which you can book a flight from Islip, New York to Washington, D.C. (average of $48). Flying from Islip, New York to Washington, D.C. in January is currently the most expensive (average of $119). 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?

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 diciembre 15, 2025.

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 36% versus a flight in the evening.

Reviews of airlines servicing Washington, D.C.

Get insights into the airlines that provide service to Washington, D.C.. 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 Washington, D.C.. Reviews last updated diciembre 15, 2025.
Get a feel of what it's like to fly with Southwest 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
7.9
Good
4,250 reviews

Comfort

8.0

Overall

7.9

Food

7.0

Boarding

8.1

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
7.9
Good
4,250 reviews
Southwest
7.9
Good
4,250 reviews

Comfort

8.0

Overall

7.9

Food

7.0

Boarding

8.1

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

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.?

    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 long is the flight from Islip, New York to Washington, D.C.?

    There are many flights that can get you from Islip, New York to Washington, D.C. in 1h 20m. Fly via Southwest to get the fastest option. The distance between Islip, New York and Washington, D.C. is about 219 mi. All flights are typically nonstop.

  • 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, March is the cheapest month in which you can book a flight from Islip, New York to Washington, D.C. (average of $48). Flying from Islip, New York to Washington, D.C. in January is currently the most expensive (average of $119). 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

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

Book flights to Washington, D.C. if you plan to visit one of these locations
Alexandria
Woodbridge
Tysons
Arlington
Owings Mills
Springfield
Hanover
Silver Spring
Fredericksburg
Linthicum Heights
Rockville
Laurel
Towson
Manassas
National Harbor
Bowie
Largo
McLean
Clinton
Cordova

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Alternative routes for Islip to Washington, D.C.

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Islip to Washington, D.C.

Discover the top airline that operate flights from Islip to Washington, D.C.. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated diciembre 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$250Average$351FlexibilityNo cancel feeOn-time63%

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