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$99+ 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 8/27. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — BWI
Aug 4 — Aug 111
Mon 8/4
Mon 8/11
1 adult, Economy
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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 July 30, 2025.

Round-trip from

$262
(Southwest)

One-way from

$99
(Southwest)

Popular in

December

Cheapest in

April

Average price

$229
From Islip Long Island to District of Columbia
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One-way flight from Islip Long Island to District of Columbia
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($50 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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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 July 30, 2025.

This Southwest deal was found by Cheapflights users on 7/30. 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.
Wed 8/274:00 pmISP - DCA
1 stop6h 00mSouthwest
Wed 9/36:55 amDCA - ISP
1 stop6h 20mSouthwest
Deal found 7/30$197
This Expedia deal was found by Cheapflights users on 7/28. 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.
Sat 9/611:35 amISP - DCA
1 stop9h 19mJetBlue
Mon 9/86:19 amDCA - ISP
2 stops9h 04mJetBlue
Deal found 7/28$279
This United deal was found by Cheapflights users on 7/28. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/67:30 amISP - DCA
2 stops7h 52mMultiple Airlines
Mon 9/85:27 pmDCA - ISP
2 stops17h 31mMultiple Airlines
Deal found 7/28$725

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 July 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

Wed 8/27

4:00 pm-10:00 pm

1 stop6h 00m

Washington, D.C. Reagan-National

Wed 9/3

6:55 am-1:15 pm

1 stop6h 20m

$197

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sat 9/6

11:35 am-8:54 pm

1 stop9h 19m

Washington, D.C. Reagan-National

Mon 9/8

6:19 am-3:23 pm

2 stops9h 04m

$279

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sat 9/6

7:30 am-3:22 pm

2 stops7h 52m

Washington, D.C. Reagan-National

Mon 9/8

5:27 pm-10:58 am

2 stops17h 31m

$725

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 8/27

4:00 pm-10:00 pm

1 stop6h 00m

$99

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 9/12

11:35 am-8:54 pm

1 stop9h 19m

$118

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

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, August is the cheapest month in which you can book a flight from Islip, New York to District of Columbia (average of $241). Flying from Islip, New York to District of Columbia in March is currently the most expensive (average of $290). 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 July 30, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Islip, New York to District of Columbia as you normally would.

Weekly flight availability from Islip, New York to District of Columbia

Explore weekly flight availability from Islip to District of Columbia. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 30, 2025.

The most flights from ISP to USDC are scheduled on a Monday (5 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (1 on average).

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 July 30, 2025.
Get a feel of what it's like to fly with Southwest and JetBlue 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
4,241 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Southwest
8.0
Very good
4,241 reviews
Southwest
8.0
Very good
4,241 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
JetBlue
7.3
Good
2,913 reviews
Southwest
8.0
Very good
4,241 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

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 popular is this Islip, New York to District of Columbia flight route?

    The Islip Long Island to District of Columbia flight path was viewed by 10 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • What are the cheapest flights from Islip, New York to District of Columbia?

    The cheapest flight price from Islip, New York to District of Columbia is $93. On average you can expect to pay $354. The most popular route, (Islip Long Island - Washington, D.C. Reagan-National), can usually be booked for $215.

  • 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, August is the cheapest month in which you can book a flight from Islip, New York to District of Columbia (average of $241). Flying from Islip, New York to District of Columbia in March is currently the most expensive (average of $290). 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.

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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 July 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$273Average$351FlexibilityNo cancel feeOn-time63%

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