$347 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 3/25. 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, 0 bags

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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Flight Deals

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

Sat, May 16 - Sat, May 16
Southwest Logo
5:30 am - 11:20 am
ISP
-
DCA
5h 50m
1 stop
Southwest Logo
3:55 pm - 10:40 pm
DCA
-
ISP
6h 45m
1 stop
$347Southwest
Wed, Apr 15 - Wed, Apr 22
Southwest Logo
6:55 am - 3:45 pm
ISP
-
DCA
8h 50m
1 stop
Southwest Logo
1:00 pm - 10:40 pm
DCA
-
ISP
9h 40m
1 stop
$352Southwest
Wed, Apr 15 - Sat, Apr 18
Southwest Logo
6:55 am - 3:45 pm
ISP
-
DCA
8h 50m
1 stop
Southwest Logo
3:55 pm - 10:40 pm
DCA
-
ISP
6h 45m
1 stop
$367Southwest
Wed, Apr 15 - Sat, Apr 18
Southwest Logo
2:30 pm - 10:25 pm
ISP
-
DCA
7h 55m
2 stops
Southwest Logo
3:55 pm - 10:40 pm
DCA
-
ISP
6h 45m
1 stop
$372Southwest
Fri, Apr 17 - Fri, Apr 24
Southwest Logo
5:10 pm - 10:50 pm
ISP
-
DCA
5h 40m
1 stop
Southwest Logo
6:00 am - 12:05 pm
DCA
-
ISP
6h 05m
1 stop
$377Southwest
Wed, Apr 15 - Wed, Apr 22
Southwest Logo
2:30 pm - 10:25 pm
ISP
-
DCA
7h 55m
2 stops
Southwest Logo
6:05 am - 4:35 pm
DCA
-
ISP
10h 30m
1 stop
$378Southwest
Thu, May 14 - Sun, May 17
Southwest Logo
5:10 pm - 10:50 pm
ISP
-
DCA
5h 40m
1 stop
Southwest Logo
1:00 pm - 11:45 pm
DCA
-
ISP
10h 45m
1 stop
$412Southwest
Fri, Apr 17 - Fri, Apr 24
Southwest Logo
6:50 am - 6:05 pm
ISP
-
DCA
11h 15m
2 stops
Southwest Logo
6:00 am - 12:05 pm
DCA
-
ISP
6h 05m
1 stop
$419Southwest
Sun, Apr 26 - Wed, Apr 29
Southwest Logo
5:15 am - 12:00 pm
ISP
-
DCA
6h 45m
1 stop
Southwest Logo
6:05 am - 4:35 pm
DCA
-
ISP
10h 30m
1 stop
$453Southwest
Tue, Mar 31 - Sat, Apr 4
Southwest Logo
6:10 am - 12:00 pm
ISP
-
DCA
5h 50m
1 stop
Southwest Logo
7:25 am - 5:20 pm
DCA
-
ISP
9h 55m
1 stop
$454Southwest
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 $247 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 $247.

Good to know

Low seasonDecember
Cheapest flight$294
Best time to beat the crowds with an average 45% drop in price.
Most popular time to fly and prices are also 35% 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.

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 4324 reviews
8.1Boarding
8.6Crew
8.0Comfort
7.0Food
7.5Entertainment
Airline reviews

I flew twice this week on Southwest, was delayed over 2 hours both ways. From Pittsburgh to Chicago it was due to weather but the gate agents, pilot etc were great at updating everyone. Today from Midway to Pittsburgh the plane had come from an international location, kept getting delayed, no information was given until we were delayed for the third time. It was ridiculous, whoever scheduled that plane to fly to Pittsburgh after didn’t consider a lot of things.

2.0 MediocreBeth, Mar 2026
MDW - PIT
Read more Southwest reviews

I flew twice this week on Southwest, was delayed over 2 hours both ways. From Pittsburgh to Chicago it was due to weather but the gate agents, pilot etc were great at updating everyone. Today from Midway to Pittsburgh the plane had come from an international location, kept getting delayed, no information was given until we were delayed for the third time. It was ridiculous, whoever scheduled that plane to fly to Pittsburgh after didn’t consider a lot of things.

Boarding was easy. The seats are small and fairly uncomfortable

I was supposed to be on a later flight. When I showed up at the gate, the woman working there was extremely helpful getting moved up to this earlier flight.

We had a 5 hour delay on the tarmac in Baltimore

Long layover between flights to Long Island from BWI - need better coordination between flights

I elected to pay for the upgrades and found very little difference

The new seating arrangement is so over priced for what you get.

The problem with the seat assignments is that there were a lot of rows in the front that were empty but my row at the back was full. Just not so pleasant.

No food or entertainment, just a quick 40 minute flight. A little bumpy due to Santa Ana winds but pilot has no control over that. Good flight and landing!

Good but I prefer choose your own seat. With the new assigned seats they should board from the back I see no advantage to this new boarding. Just like every other airline

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

Information on your arrival and departure airports