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$111+ 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 11/18. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — IAD
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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Find 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 October 30, 2025.

This Trip.com deal was found by Cheapflights users on 10/28. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/58:29 pmISP - DCA
2 stops20h 30mFrontier
Sun 12/72:00 pmDCA - ISP
2 stops19h 13mFrontier
Deal found 10/28$288
This JetBlue deal was found by Cheapflights users on 10/30. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/2810:32 amISP - DCA
1 stop7h 03mJetBlue
Sat 11/299:55 amDCA - ISP
1 stop8h 06mJetBlue
Deal found 10/30$326
This JetBlue deal was found by Cheapflights users on 10/29. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/181:15 pmISP - DCA
1 stop9h 00mJetBlue
Thu 11/2010:45 amDCA - ISP
1 stop7h 16mJetBlue
Deal found 10/29$377
This Trip.com deal was found by Cheapflights users on 10/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/1710:44 amISP - DCA
1 stop24h 11mJetBlue
Wed 11/1911:05 amDCA - ISP
1 stop22h 40mJetBlue
Deal found 10/30$393
This Southwest deal was found by Cheapflights users on 10/29. 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.
Tue 11/183:40 pmISP - DCA
1 stop7h 10mSouthwest
Thu 11/206:55 amDCA - ISP
2 stops8h 10mSouthwest
Deal found 10/29$403
This Trip.com deal was found by Cheapflights users on 10/28. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/14:58 pmISP - DCA
2 stops45h 04mFrontier
Mon 11/36:00 pmDCA - ISP
2 stops23h 42mFrontier
Deal found 10/28$412
This Southwest deal was found by Cheapflights users on 10/30. 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 11/173:40 pmISP - DCA
1 stop7h 10mSouthwest
Wed 11/196:55 amDCA - ISP
2 stops8h 10mSouthwest
Deal found 10/30$443
This Southwest deal was found by Cheapflights users on 10/29. 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.
Fri 12/53:40 pmISP - DCA
1 stop7h 10mSouthwest
Sun 12/711:55 amDCA - ISP
1 stop10h 40mSouthwest
Deal found 10/29$454
This Southwest deal was found by Cheapflights users on 10/29. 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 11/261:35 pmISP - DCA
1 stop7h 10mSouthwest
Wed 12/36:55 amDCA - ISP
1 stop5h 35mSouthwest
Deal found 10/29$457

Cheap 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 October 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$288
(Trip.com)

One-way from

$111
(JetBlue)

Popular in

December

Cheapest in

April

Average price

$263
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. 20% potential increase in price ($56 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 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 October 30, 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

Fri 12/5

8:29 pm-4:59 pm

2 stops20h 30m

Washington, D.C. Reagan-National

Sun 12/7

2:00 pm-9:13 am

2 stops19h 13m

$288

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Tue 11/18

1:15 pm-10:15 pm

1 stop9h 00m

Washington, D.C. Reagan-National

Thu 11/20

10:45 am-6:01 pm

1 stop7h 16m

$377

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Mon 11/17

10:44 am-10:55 am

1 stop24h 11m

Washington, D.C. Reagan-National

Wed 11/19

11:05 am-9:45 am

1 stop22h 40m

$393

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Tue 11/18

3:40 pm-10:50 pm

1 stop7h 10m

Washington, D.C. Reagan-National

Thu 11/20

6:55 am-3:05 pm

2 stops8h 10m

$403

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 12/5

3:40 pm-10:50 pm

1 stop7h 10m

Washington, D.C. Reagan-National

Sun 12/7

11:55 am-10:35 pm

1 stop10h 40m

$443

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Mon 11/17

3:40 pm-10:50 pm

1 stop7h 10m

Washington, D.C. Reagan-National

Wed 11/19

6:55 am-3:05 pm

2 stops8h 10m

$443

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 11/26

1:35 pm-8:45 pm

1 stop7h 10m

Washington, D.C. Reagan-National

Wed 12/3

6:55 am-12:30 pm

1 stop5h 35m

$457

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 12/10

11:50 am-6:55 pm

1 stop7h 05m

Washington, D.C. Reagan-National

Wed 12/17

11:00 am-7:50 pm

1 stop8h 50m

$497

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Tue 11/18

1:15 pm-10:15 pm

1 stop9h 00m

$111

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Tue 2/24

1:15 pm-8:59 pm

1 stop7h 44m

$111

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Showing 1-10 of 17 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 $48). Flying from Islip, New York to District of Columbia in January is currently the most expensive (average of $197). 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 October 30, 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 23% on the cost of your flight, compared to a flight at noon.

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 October 30, 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
8.0
Very good
4,243 reviews

Comfort

8.0

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,243 reviews
Southwest
8.0
Very good
4,243 reviews

Comfort

8.0

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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?

    Frontier, JetBlue, and Southwest can get you from Islip, New York to District of Columbia in just under 7h 10m. Your travel time can differ by up to 13h 20m. The distance between Islip, New York and District of Columbia is about 248 mi. This flight may include one or multiple stops.

  • 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 $197). 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$250Average$387FlexibilityNo cancel feeOn-time63%

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