IAD - ISP

$121 Find Cheap Flights from Washington Dulles Airport to Islip

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Dulles Intl to Islip departing on 2/22. 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, 0 bags

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

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to Islip, 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 Washington, D.C. to Islip, as well as popular online travel agencies
Travelers love KAYAK
41.299.237 searches in the past 7 days on KAYAK

Save 23% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$235
Frontier
Fri 1/30Sun 2/1
IAD - ISP • 1 stop
Cheapest one-way
$121
Frontier
Sun 2/22
IAD - ISP • 1 stop
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Islip!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Dulles Intl to Islip (IAD-ISP)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Dulles Intl to Islip 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 Dulles Intl to Islip

Fri, Jan 30 - Sun, Feb 1
Frontier Logo
9:35 am - 8:47 pm
IAD
-
ISP
11h 12m1 stop
Frontier Logo
7:53 pm - 4:28 pm
ISP
-
IAD
20h 35m2 stops
$235Frontier
Sun, Jan 25 - Thu, Jan 29
Multiple Airlines Logo
5:37 pm - 1:21 pm
IAD
-
ISP
19h 44m2 stops
Multiple Airlines Logo
7:43 pm - 8:40 am
ISP
-
IAD
12h 57m1 stop
$264Multiple Airlines
Sun, Jan 25 - Wed, Jan 28
Multiple Airlines Logo
2:10 pm - 11:15 am
IAD
-
ISP
21h 05m1 stop
Multiple Airlines Logo
11:50 am - 10:42 am
ISP
-
IAD
22h 52m2 stops
$281Multiple Airlines
Fri, Jan 30 - Sun, Feb 1
Multiple Airlines Logo
9:35 am - 8:47 pm
IAD
-
ISP
11h 12m1 stop
Multiple Airlines Logo
10:31 am - 5:47 pm
ISP
-
IAD
7h 16m1 stop
$311Multiple Airlines
Sat, Jan 31 - Sun, Feb 1
Multiple Airlines Logo
11:39 am - 8:40 am
IAD
-
ISP
21h 01m2 stops
Multiple Airlines Logo
12:00 pm - 8:06 pm
ISP
-
IAD
8h 06m1 stop
$331Multiple Airlines
Sun, Jan 25 - Thu, Jan 29
Multiple Airlines Logo
2:10 pm - 11:15 am
IAD
-
ISP
21h 05m1 stop
Multiple Airlines Logo
7:43 pm - 8:40 am
ISP
-
IAD
12h 57m1 stop
$332Multiple Airlines
Wed, Apr 1 - Sat, Apr 4
Frontier Logo
9:58 pm - 8:41 am
IAD
-
ISP
10h 43m1 stop
Frontier Logo
8:19 pm - 8:18 am
ISP
-
IAD
11h 59m1 stop
$355Frontier
Sun, Jan 25 - Fri, Jan 30
Multiple Airlines Logo
2:10 pm - 11:15 am
IAD
-
ISP
21h 05m1 stop
Multiple Airlines Logo
9:43 pm - 10:44 am
ISP
-
IAD
13h 01m2 stops
$381Multiple Airlines
Sun, Jan 18 - Thu, Jan 22
Frontier Logo
8:49 am - 7:03 pm
IAD
-
ISP
10h 14m1 stop
Frontier Logo
7:43 pm - 8:40 am
ISP
-
IAD
12h 57m1 stop
$382Frontier
Sun, Jan 18 - Thu, Jan 22
Multiple Airlines Logo
8:49 am - 7:03 pm
IAD
-
ISP
10h 14m1 stop
Multiple Airlines Logo
11:55 am - 8:40 am
ISP
-
IAD
20h 45m2 stops
$385Multiple Airlines
Booking Insights

Good to know

Cheapest flight$121
Flight from Washington Dulles Airport to Islip

When to book flights from Dulles Intl to Islip

Are your dates flexible? Find out the best times to travel from Dulles Intl to Islip based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking Washington Dulles Airport to Islip flights

  • What is the cheapest flight from Washington, D.C. Dulles Intl Airport to Islip?

    In the last 3 days, the lowest price for a flight from Washington, D.C. Dulles Intl Airport to Islip was $121 for a one-way ticket and $235 for a round-trip.

  • Do I need a passport to fly between Washington Dulles Airport and Islip?

    A passport is not required to fly from Washington Dulles Airport to Islip.

  • Which airports will I be using when flying from Washington Dulles Airport to Islip?

    When flying out of Washington Dulles Airport you will be using Washington, D.C. Dulles Intl. You will be landing at Islip, also known as Islip Long Island.

  • Which aircraft models fly most regularly from Washington Dulles Airport to Islip?

    We unfortunately don’t have that data for this specific route.

  • How does KAYAK find such low prices on flights from Washington Dulles Airport to Islip?

    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 Washington Dulles Airport to Islip.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington Dulles Airport to Islip?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Islip from Washington Dulles Airport 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 Washington Dulles Airport to Islip?

    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 to Islip with an airline and back to Washington Dulles Airport with another airline. Booking your flights between Washington Dulles Airport and ISP can sometimes prove cheaper using this method.

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

    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 to Islip from Washington Dulles Airport up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Everything you need to know for your flight from Dulles Intl to Islip

Information on your arrival and departure airports

Washington Dulles Airport (IAD)
Islip (ISP)