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$147+ Cheap flights from Islip, NY (ISP) to District of Columbia

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 1/8. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — IAD
Jan 14 — Jan 211
Wed 1/14
Wed 1/21
1 adult, Economy
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Cheap flight deals from Islip to District of Columbia

Cheapest flights from Islip to District of Columbia
Explore the most affordable flight options available from Islip to District of Columbia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 15, 2025.

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.
Sun 12/212:45 pmISP - DCA
2 stops8h 05mSouthwest
Wed 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.
Mon 12/153:40 pmISP - DCA
1 stop7h 10mSouthwest
Tue 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.
Wed 12/176:15 amISP - DCA
2 stops11h 10mSouthwest
Fri 12/197:30 amDCA - ISP
1 stop9h 35mSouthwest
Deal found 12/13$728
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/183:25 pmISP - DCA
1 stop7h 25mSouthwest
Sat 12/207:20 amDCA - ISP
1 stop7h 20mSouthwest
Deal found 12/14$742
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.
Sun 12/212:45 pmISP - DCA
2 stops8h 05mSouthwest
Fri 12/267:30 amDCA - ISP
1 stop9h 35mSouthwest
Deal found 12/13$807

Find flight deals from Islip to District of Columbia

Keep the following information in mind while searching for Islip to District of Columbia flight deals. Data was last updated December 15, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$367
(Southwest)

One-way from

$147
(JetBlue)

Popular in

January

Cheapest in

April

Average price

$256
Provider with most accurate pricing for New York (NYC)-Washington, D.C. (WAS) flight deals.
Search Deals
Provider most trusted by Cheapflights users for New York (NYC)-Washington, D.C. (WAS) flights.
Search Deals
From Islip Long Island to District of Columbia
Search Deals
One-way flight from Islip Long Island to District of Columbia
Search Deals
Highest demand for flights based on searches. 22% potential increase in price ($59 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to District of Columbia 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 December 15, 2025.
Use the filters below to find and compare flights from Islip to District of Columbia that are best for you.

Fly from

Islip

Fly to

District of Columbia

Route

Depart

Return

Price

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 1/7

9:15 am-3:45 pm

1 stop6h 30m

Washington, D.C. Reagan-National

Thu 1/15

7:30 am-1:30 pm

1 stop6h 00m

$367

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 1/16

2:10 pm-10:55 pm

2 stops8h 45m

Washington, D.C. Reagan-National

Mon 1/19

7:30 am-1:30 pm

1 stop6h 00m

$418

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 3/18

2:20 pm-10:35 pm

2 stops8h 15m

Washington, D.C. Reagan-National

Sun 3/22

6:55 am-5:15 pm

1 stop10h 20m

$428

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Tue 12/30

7:40 pm-9:04 am

1 stop13h 24m

Washington, D.C. Reagan-National

Sat 1/3

9:10 am-7:45 pm

1 stop10h 35m

$834

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Thu 1/8

12:25 pm-10:31 pm

1 stop10h 06m

$147

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 1/7

12:25 pm-10:31 pm

1 stop10h 06m

$182

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 12/31

3:40 pm-10:35 pm

1 stop6h 55m

$224

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Tue 12/30

6:55 am-3:55 pm

1 stop9h 00m

$234

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sat 1/10

12:25 pm-10:31 pm

1 stop10h 06m

$242

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 1/9

12:25 pm-10:31 pm

1 stop10h 06m

$247

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/13

Showing 1-10 of 12 results
1
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Best time to book a flight from Islip to District of Columbia

Have a flexible travel schedule? Discover the best time to fly to District of Columbia 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 District of Columbia

What is the cheapest month to book a flight from Islip, New York to District of Columbia?

Currently, March is the cheapest month in which you can book a flight from Islip, New York to District of Columbia (average of $48). Flying from Islip, New York to District of Columbia 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 DC?

Find hourly flight availability from Islip to District of Columbia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 15, 2025.

It’s optimal to fly from Islip, New York to District of Columbia in the afternoon. By choosing this option you can save up to 36% on the cost of your flight, compared to a flight in the evening.

Reviews of airlines servicing District of Columbia

Get insights into the airlines that provide service to District of Columbia. 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 District of Columbia. Reviews last updated December 15, 2025.
Get a feel of what it's like to fly with Southwest from Islip to District of Columbia by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
7.9
Good
4,250 reviews

Boarding

8.1

Food

7.0

Comfort

8.0

Overall

7.9

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

Boarding

8.1

Food

7.0

Comfort

8.0

Overall

7.9

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 District of Columbia. 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 District of Columbia?

    For a flight from Islip to District of Columbia, you will be flying from Long Island. Islip Long Island (ISP) is just 7.2 mi from the center of the city.

  • How long is the flight from Islip, New York to District of Columbia?

    Southwest can get you from Islip, New York to District of Columbia in just under 6h 30m. Your travel time can differ by up to . The distance between Islip, New York and District of Columbia is about 248 mi.

  • Can I find deals for flights from Islip to District of Columbia that include hotel bookings?

    Yes. In addition to deals on Islip to District of Columbia flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Islip to District of Columbia?

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

  • Can I find deals for business class flights from Islip to District of Columbia?

    Yes. Cheapflights offers flight deals from Islip to District of Columbia 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 District of Columbia?

    Currently, March is the cheapest month in which you can book a flight from Islip, New York to District of Columbia (average of $48). Flying from Islip, New York to District of Columbia 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

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Top airline flying from Islip to District of Columbia

Discover the top airline that operate flights from Islip to District of Columbia. 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 December 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$250Average$351FlexibilityNo cancel feeOn-time63%

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