$118 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 9/12. 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.
Baltimorenonstop$186
Washington, D.C.
Baltimorenonstop$186

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

Wed, Aug 27 - Wed, Sep 3
Southwest Logo
4:00 pm - 10:00 pmISP-DCA
6h 00m1 stop
Southwest Logo
6:55 am - 1:15 pmDCA-ISP
6h 20m1 stop
$197Southwest
Find Deal
Wed, Aug 27 - Wed, Sep 3
Southwest Logo
2:05 pm - 10:00 pmISP-DCA
7h 55m2 stops
Southwest Logo
6:55 am - 1:15 pmDCA-ISP
6h 20m1 stop
$202Southwest
Find Deal
Wed, Aug 27 - Wed, Sep 3
Southwest Logo
2:05 pm - 10:00 pmISP-DCA
7h 55m2 stops
Southwest Logo
6:55 am - 3:15 pmDCA-ISP
8h 20m2 stops
$207Southwest
Find Deal
Sat, Sep 6 - Sat, Sep 13
Southwest Logo
6:05 am - 5:00 pmISP-DCA
10h 55m1 stop
Southwest Logo
6:55 am - 3:05 pmDCA-ISP
8h 10m2 stops
$208Southwest
Find Deal
Wed, Aug 27 - Tue, Sep 2
Southwest Logo
4:00 pm - 10:00 pmISP-DCA
6h 00m1 stop
Southwest Logo
12:50 pm - 9:05 pmDCA-ISP
8h 15m1 stop
$262Southwest
Find Deal
Wed, Aug 27 - Tue, Sep 2
Southwest Logo
4:00 pm - 10:00 pmISP-DCA
6h 00m1 stop
Southwest Logo
6:55 am - 3:15 pmDCA-ISP
8h 20m2 stops
$267Southwest
Find Deal
Wed, Aug 27 - Tue, Sep 2
Southwest Logo
2:05 pm - 10:00 pmISP-DCA
7h 55m2 stops
Southwest Logo
6:55 am - 3:15 pmDCA-ISP
8h 20m2 stops
$272Southwest
Find Deal
Sat, Sep 6 - Mon, Sep 8
JetBlue Logo
11:35 am - 8:54 pmISP-DCA
9h 19m1 stop
JetBlue Logo
4:00 pm - 3:23 pmDCA-ISP
23h 23m1 stop
$337JetBlue
Find Deal
Thu, Sep 18 - Sun, Sep 21
Southwest Logo
6:25 am - 4:10 pmISP-DCA
9h 45m1 stop
Southwest Logo
6:55 am - 5:00 pmDCA-ISP
10h 05m2 stops
$358Southwest
Find Deal
Sat, Sep 6 - Sat, Sep 13
 Logo
7:30 am - 3:22 pmISP-DCA
7h 52m2 stops
 Logo
6:00 am - 8:01 pmDCA-ISP
14h 01m2 stops
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?

The cheapest price for flight routes found by users searching on KAYAK in the last 2 weeks for round-trip flights from Islip to District of Columbia.

The cheapest ticket to District of Columbia from Islip found in the last 72 hours was to Baltimore, at $192 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 $192.

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 August and March, when the average cost of round-trip tickets is $666 and $599 respectively.

What’s the cheapest day of the week to fly from Islip to District of Columbia?

The average price of all round-trip flights from Islip to District of Columbia clicked on KAYAK for each day over the last 12 months.

When flying from Islip to District of Columbia, you should consider leaving on a Tuesday and avoid Sundays if you are looking for the best rates. For your return to Islip, you’ll find the best rates on Tuesdays and the most expensive ones on Wednesdays.


Good to know

Low seasonJuly
Cheapest flight$118
Best time to beat the crowds but there is an average 20% increase in price.
Most popular time to fly and prices are also 3% lower on average.
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 4241 reviews
8.0Comfort
8.1Boarding
8.6Crew
7.5Entertainment
7.0Food
Airline reviews

southwest just starting charging for luggage. hadnt realized it until it was too late. now out $70 when i couldve bought a carry on if i wouldve known. free bags was one of the only reasons i chose southwest over another airline (the other being no assigned seats, which is apparently also being changed). stupid business decision. wont be flying southwest anymore.

2.0 MediocreAnonymous, Jul 2025AUS - RDU
Read more Southwest reviews

southwest just starting charging for luggage. hadnt realized it until it was too late. now out $70 when i couldve bought a carry on if i wouldve known. free bags was one of the only reasons i chose southwest over another airline (the other being no assigned seats, which is apparently also being changed). stupid business decision. wont be flying southwest anymore.

The quality of Southwest Airlines continues to degrade each time I fly with them. If it were not for the free luggage, I would probably choose another airline. Their prices are a little bit competitive, but way too high for the quality of the service. Southwest is not unique in this way. Domestic flight in the United States of America has continued to be a lower and lower quality product. Very sad when you compare the quality of domestic airlines to that of many international airlines around the world.

Very smooth checking in our luggage with a super pleasant SW agent. I enjoyed a fun entertaining movie.

WiFi did not work. For as outrageous as these flights cost, when they’re advertised with certain services/ features they should be in working order

Worst experience I had on Southwest. Still better than most, but the seating was barely tolerable.

The Southwest employees (all two of them) were very nice and cheerful despite the fact the line to self-check a bag (simply drop it off) was hundreds of people long. Thank God I arrived early to the airport because I stood in this line for at least an hour. Once on the flight that had been delayed by an hour, we had no Wi-Fi and thus no entertainment. Finally, I hope the investor strong arm tactics against Southwest pay off in a short-term windfall to your C-Suite because the rest of you are screwed. I have been a faithful Southwest customer for 15 years due to everything you just got rid of. I'm flying to Idaho and Washington in October, both places I used to simply book with Southwest without a second thought now with Frontier (Washington) and United (Idaho) because they offer everything the "new" Southwest does but cheaper and at better times, destinations, etc. This really makes me sad...

It was okay. The plane was delayed from earlier in the day, but they kept updating the departure time, sometimes later, sometimes earlier. That was stressful. Once we finally got on and took off, it was fine. I was supposed to have a connection in Chicago to Los Angeles, and the time for so late I was rebooked to arrive in LA 3 hours late. The departure time to Chicago later became early enough to have taken my original connection and arrive earlier but that wasn't an option.

It was one and half hour late... Not sure if any other experience matters.

Delayed flight. Nicest crew member was a SW pilot flying seated next to me who kindly move to seat the final passenger. Flight extra delayed. My cup of refreshment of ginger ale was so packed with ice it was literally 2 sips.

For my birthday trip this was my second time ever flying, this trip was the best.

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

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