$113 Find Cheap Flights from Islip to District of Columbia

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Islip to District of Columbia departing on 10/22. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to District of Columbia

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Islip to District of Columbia, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Islip to District of Columbia, as well as popular online travel agencies
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Cheap Flights from Islip to District of Columbia

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Washington, D.C.
Baltimore1 stop$161
Washington, D.C.
Baltimore1 stop$161

Book Cheap Islip to District of Columbia Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Islip to District of Columbia that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Islip to District of Columbia

Tue, Oct 28 - Fri, Oct 31
JetBlue Logo
1:57 pm - 10:29 pmISP-DCA
8h 32m1 stop
JetBlue Logo
6:15 am - 1:11 pmDCA-ISP
6h 56m1 stop
$287JetBlue
Find Deal
Wed, Nov 26 - Sat, Nov 29
Southwest Logo
6:55 am - 3:55 pmISP-DCA
9h 00m1 stop
Southwest Logo
12:55 pm - 10:50 pmDCA-ISP
9h 55m1 stop
$392Southwest
Find Deal
Thu, Oct 16 - Sun, Oct 19
Southwest Logo
3:20 pm - 10:55 pmISP-DCA
7h 35m1 stop
Southwest Logo
1:00 pm - 10:40 pmDCA-ISP
9h 40m1 stop
$393Southwest
Find Deal
Wed, Nov 26 - Sat, Nov 29
Southwest Logo
2:40 pm - 10:50 pmISP-DCA
8h 10m2 stops
Southwest Logo
12:55 pm - 10:50 pmDCA-ISP
9h 55m1 stop
$398Southwest
Find Deal
Sat, Nov 8 - Sun, Nov 9
Southwest Logo
12:25 pm - 9:00 pmISP-DCA
8h 35m1 stop
Southwest Logo
11:55 am - 10:35 pmDCA-ISP
10h 40m1 stop
$414Southwest
Find Deal
Tue, Sep 30 - Fri, Oct 3
Southwest Logo
5:30 am - 11:10 amISP-DCA
5h 40m1 stop
Southwest Logo
6:55 am - 2:35 pmDCA-ISP
7h 40m1 stop
$449Southwest
Find Deal
Mon, Oct 13 - Mon, Oct 20
Southwest Logo
5:55 am - 3:55 pmISP-DCA
10h 00m1 stop
Southwest Logo
6:55 am - 2:35 pmDCA-ISP
7h 40m1 stop
$452Southwest
Find Deal
Tue, Sep 30 - Fri, Oct 3
Southwest Logo
2:05 pm - 10:00 pmISP-DCA
7h 55m2 stops
Southwest Logo
6:55 am - 2:35 pmDCA-ISP
7h 40m1 stop
$476Southwest
Find Deal
Mon, Sep 29 - Fri, Oct 3
JetBlue Logo
11:35 am - 8:54 pmISP-DCA
9h 19m1 stop
JetBlue Logo
9:45 am - 3:44 pmDCA-ISP
5h 59m1 stop
$689JetBlue
Find Deal
Sat, Nov 8 - Sun, Nov 9
Multiple Airlines Logo
7:30 am - 8:38 pmISP-DCA
13h 08m2 stops
Multiple Airlines Logo
11:05 am - 7:45 pmDCA-ISP
8h 40m2 stops
$775Multiple Airlines
Find Deal
Booking Insights

KAYAK's insights & trends for Islip to District of Columbia flights

Get data-powered insights and trends into flights from Islip to District of Columbia to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest Islip to District of Columbia flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to District of Columbia from Islip found in the last 72 hours was to Baltimore, at $211 round-trip. The most popular route is from Islip (ISP) to Baltimore (BWI), and the cheapest round-trip airline ticket found on this route in the last 72 hours was $211.

What is the cheapest month to fly from Islip to District of Columbia?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Islip to District of Columbia, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Islip to District of Columbia is May, when tickets cost $296 (return) on average. On the other hand, the most expensive months are July and August, when the average cost of round-trip tickets is $766 and $766 respectively.

Good to know

Low seasonJuly
Cheapest flight$113
Best time to beat the crowds but there is an average 61% increase in price.
Most popular time to fly with an average 26% increase in price.
Flight from Islip to Reagan Washington National Airport

FAQs - booking District of Columbia flights

  • How does KAYAK find such low prices on flights from Islip to District of Columbia?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Islip to District of Columbia.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Islip to District of Columbia?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Islip to District of Columbia is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Islip to District of Columbia?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Islip to District of Columbia with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Islip to District of Columbia?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Islip to District of Columbia up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to District of Columbia?

    The cheapest time of day to fly to District of Columbia is generally in the evening, when round-trip flights cost $335 on average. Morning departures are around 33% more expensive than evening flights, on average. The most expensive time of day to fly to District of Columbia is generally in the morning, which is peak travel time and where the average cost of a ticket is $447.

Reviews of the top airline flying from Islip to District of Columbia

 
See real verified KAYAK customer reviews for airlines flying from Islip to District of Columbia. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Islip to District of Columbia? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4242 reviews
7.5Entertainment
8.6Crew
8.1Boarding
7.0Food
8.0Comfort
Airline reviews

I wish they had movie screens in the headrests. The seats are much improved, more legroom and recently renovated. Bathroom was clean. Staff was outstanding!!

10.0 ExcellentG, Sep 2025LAS - ATL
Read more Southwest reviews

I wish they had movie screens in the headrests. The seats are much improved, more legroom and recently renovated. Bathroom was clean. Staff was outstanding!!

As always, the entire Southwest experience was wonderful, from online booking to flight to baggage retrieval. Very grateful.

The weather could have been better. There was a 40 minute ATC delay in SFO because of marine fog and a micro cell storm delayed landing and take-off at Nashville. The gate was changed 5 minutes from boarding from gate B3 to gate C23 at Nashville airport.

After being assaulted by a flight attendant I was then brushed off as oh well because he long braids didn’t mean to whip me in the eye. I have filed complaints and will see. But like any other issue I’ve had with kayak involved it’s been trash. Last time I’ll be using your app

AC sub par. WiFi not working correctly. Ac sucked. Seats very narrow.

Near 4 hour flight with only 1 service. Had to use call button to request water. Internet and power not working until into flight. Internet would stop working during flight.

Southwest's seats are the least comfortable I have ever sat in.

The cabin was quiet for the redeye flight. The area was clean. The staff was great. The 787 Max was in good condition. Drawbacks were that the seat widths were tight for some passengers. The seat padding was at best average and for a long flight uncomfortable.

Southwest like most American domestic airlines, is a mediocre airline. But it is among the cheapest. Oh well.

My flight was delayed 50 minutes and we were rushed to board to then sit for 15 minutes until the pilot arrived. Unacceptable since we could have waited to board. Also the delayed flight was updated AFTER we boarded to more than the 10 minutes as originally stated.

Everything you need to know for your flight from Islip to District of Columbia

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