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District of Columbia

$184+ 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 6/13. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — IAD
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
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 January 29, 2026.

This Southwest deal was found by Cheapflights users on 1/27. 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 3/22:10 pm
ISP
-
DCA
2 stops8h 45m
Southwest
Tue 3/37:55 am
DCA
-
ISP
1 stop6h 40m
Southwest
Deal found 1/27$332
This Southwest deal was found by Cheapflights users on 1/29. 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 4/226:55 am
ISP
-
DCA
1 stop8h 50m
Southwest
Sat 4/251:05 pm
DCA
-
ISP
1 stop8h 20m
Southwest
Deal found 1/29$337
This Southwest deal was found by Cheapflights users on 1/27. 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.
Fri 2/276:35 am
ISP
-
DCA
1 stop8h 20m
Southwest
Sun 3/17:30 am
DCA
-
ISP
1 stop9h 15m
Southwest
Deal found 1/27$397
This Southwest deal was found by Cheapflights users on 1/26. 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 3/111:55 am
ISP
-
DCA
1 stop8h 50m
Southwest
Tue 3/37:55 am
DCA
-
ISP
1 stop6h 40m
Southwest
Deal found 1/26$408
This Southwest deal was found by Cheapflights users on 1/27. 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 4/165:10 pm
ISP
-
DCA
1 stop5h 40m
Southwest
Mon 4/206:00 am
DCA
-
ISP
1 stop6h 05m
Southwest
Deal found 1/27$427
This Expedia deal was found by Cheapflights users on 1/28. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/168:25 pm
ISP
-
DCA
1 stop12h 35m
JetBlue
Wed 3/187:00 am
DCA
-
ISP
1 stop12h 30m
JetBlue
Deal found 1/28$428

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 January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$332
(Southwest)

One-way from

$184
(Southwest)

Popular in

January

Cheapest in

April

Average price

$283
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. 16% potential increase in price ($38 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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 January 29, 2026.
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

Mon 3/2

2:10 pm-10:55 pm

2 stops8h 45m

Washington, D.C. Reagan-National

Tue 3/3

7:55 am-2:35 pm

1 stop6h 40m

$332

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 4/22

6:55 am-3:45 pm

1 stop8h 50m

Washington, D.C. Reagan-National

Sat 4/25

1:05 pm-9:25 pm

1 stop8h 20m

$337

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 2/27

6:35 am-2:55 pm

1 stop8h 20m

Washington, D.C. Reagan-National

Sun 3/1

7:30 am-4:45 pm

1 stop9h 15m

$397

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sat 5/23

5:30 am-4:10 pm

1 stop10h 40m

Washington, D.C. Reagan-National

Sun 5/24

1:00 pm-9:05 pm

1 stop8h 05m

$402

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sun 3/1

11:55 am-8:45 pm

1 stop8h 50m

Washington, D.C. Reagan-National

Tue 3/3

7:55 am-2:35 pm

1 stop6h 40m

$408

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sat 6/13

5:35 am-2:15 pm

1 stop8h 40m

$184

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 6/19

1:51 pm-9:00 pm

1 stop7h 09m

$221

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Tue 2/10

12:25 pm-10:31 pm

1 stop10h 06m

$227

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Mon 2/9

12:25 pm-10:31 pm

1 stop10h 06m

$355

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Tue 2/3

10:00 am-6:00 pm

1 stop8h 00m

$386

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

Showing 1-10 of 13 results
1
2

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 $50). Flying from Islip, New York to District of Columbia in September is currently the most expensive (average of $107). 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 January 29, 2026.

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 20% 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 January 29, 2026.
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
8.0
Very good
4,267 reviews

Boarding

8.1

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Comfort

8.0

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
8.0
Very good
4,267 reviews
Southwest
8.0
Very good
4,267 reviews

Boarding

8.1

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Comfort

8.0

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 8h 45m. 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 $50). Flying from Islip, New York to District of Columbia in September is currently the most expensive (average of $107). 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 January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$242Average$357FlexibilityNo cancel feeOn-time63%

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