WAS - ISP

$88 Find Cheap Flights from Washington, D.C. 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 Washington, D.C. to Islip departing on 8/16. 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 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 22% 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.

Flights Deals
Booking Insights
Flights Deals

Cheap Flights from Washington, D.C. to Islip (WAS-ISP)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Washington, D.C. 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 Washington, D.C. to Islip

Sat, Oct 18 - Tue, Oct 21
Southwest Logo
11:00 am - 12:10 pmBWI-ISP
1h 10mnonstop
Southwest Logo
11:40 am - 12:55 pmISP-BWI
1h 15mnonstop
$177Southwest
Find Deal
Sat, Sep 20 - Mon, Sep 22
Southwest Logo
10:55 am - 12:05 pmBWI-ISP
1h 10mnonstop
Southwest Logo
6:00 am - 7:15 amISP-BWI
1h 15mnonstop
$186Southwest
Find Deal
Sat, Sep 13 - Sun, Sep 14
Frontier Logo
7:14 pm - 10:40 amIAD-ISP
15h 26m1 stop
Frontier Logo
5:12 pm - 8:09 pmISP-IAD
26h 57m1 stop
$195Frontier
Find Deal
Wed, Sep 17 - Thu, Sep 18
Southwest Logo
8:55 pm - 10:05 pmBWI-ISP
1h 10mnonstop
Southwest Logo
3:05 pm - 4:20 pmISP-BWI
1h 15mnonstop
$195Southwest
Find Deal
Fri, Aug 29 - Sun, Aug 31
Frontier Logo
6:52 pm - 1:59 pmIAD-ISP
19h 07m1 stop
Frontier Logo
6:05 am - 8:48 pmISP-IAD
14h 43m1 stop
$205Frontier
Find Deal
Mon, Aug 25 - Thu, Aug 28
Southwest Logo
10:50 am - 12:00 pmBWI-ISP
1h 10mnonstop
Southwest Logo
6:00 am - 7:15 amISP-BWI
1h 15mnonstop
$221Southwest
Find Deal
Mon, Sep 8 - Wed, Sep 10
JetBlue Logo
6:19 am - 3:23 pmDCA-ISP
9h 04m2 stops
JetBlue Logo
11:35 am - 8:54 pmISP-DCA
9h 19m1 stop
$299JetBlue
Find Deal
Wed, Sep 17 - Thu, Sep 18
 Logo
11:02 am - 1:39 pmBWI-ISP
26h 37m3 stops
 Logo
7:36 pm - 5:08 pmISP-BWI
21h 32m2 stops
Fri, Sep 5 - Sun, Sep 7
 Logo
6:38 am - 8:07 pmBWI-ISP
13h 29m2 stops
 Logo
2:19 pm - 12:22 pmISP-BWI
22h 03m2 stops
Tue, Aug 12 - Thu, Aug 14
JetBlue Logo
9:02 am - 4:30 pmDCA-ISP
7h 28m1 stop
JetBlue Logo
11:40 am - 7:17 pmISP-DCA
7h 37m1 stop
$722JetBlue
Find Deal
Booking Insights

KAYAK's insights & trends for Washington, D.C. to Islip flights

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

What is the cheapest Washington, D.C. to Islip flight route?

The cheapest price for flight routes found by users searching on KAYAK in the last 2 weeks for round-trip flights from Washington, D.C. to Islip.

Our data shows that the cheapest route for a return flight from Washington, D.C. to Islip cost $186 and was between Baltimore (BWI) and Islip (ISP). On average, the best prices are found if you fly this route. The average price for a return flight for this route is $186.

What’s the cheapest day of the week to fly from Washington, D.C. to Islip?

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

For Washington, D.C. to Islip, Tuesday is the cheapest day to fly on average and Wednesday is the most expensive. Flying from Islip back to Washington, D.C., the best deals are generally found on Tuesday, with Sunday being the most expensive.

What is the cheapest month to fly from Washington, D.C. to Islip?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Washington, D.C. to Islip, 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 Washington, D.C. to Islip is April, where tickets cost $285 (return) on average. On the other hand, the most expensive months are January and August, where the average cost of round-trip tickets is $533 and $450 respectively.

Can I save money by flying with a layover from Washington, D.C. to Islip?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $249 on average.

Good to know

Low seasonDecember
Cheapest flight$88
Best time to beat the crowds but there is an average 10% increase in price.
Most popular time to fly and prices are also 8% lower on average.
Flight from Washington Dulles Airport to Islip

When to book flights from Washington, D.C. to Islip

Are your dates flexible? Find out the best times to travel from Washington, D.C. 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 flights from Washington, D.C. to Islip

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

    In the last 3 days, the lowest price for a flight from Washington, D.C. to Islip was $88 for a one-way ticket and $177 for a round-trip.

  • Do I need a passport to fly between Washington, D.C. and Islip?

    A passport is not required to fly from Washington, D.C. to Islip.

  • Which airports will I be using when flying from Washington, D.C. to Islip?

    Washington, D.C. is served by 2 major airports and there is only 1 main airport in Islip. You will leave Washington, D.C. from one of these airports: Washington, D.C. Reagan-National or Washington, D.C. Dulles Intl. You will be arriving at Islip Long Island.

  • Which airlines offer Wi-Fi service onboard planes from Washington, D.C. to Islip?

    JetBlue, Delta, and American Airlines offer inflight Wi-Fi service on the Washington, D.C. to Islip flight route.

  • Which aircraft models fly most regularly from Washington, D.C. to Islip?

    The Boeing 737-800 Passenger/BBJ2 (winglets) is the aircraft model that flies most regularly on the Washington, D.C. to Islip flight route.

  • On which days can I fly direct from Washington, D.C. to Islip?

    There are nonstop flights from Washington, D.C. to Islip on a daily basis.

  • How does KAYAK find such low prices on flights from Washington, D.C. 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, D.C. to Islip.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Islip from Washington, D.C. 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, D.C. 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, D.C. with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington, D.C. 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, D.C. up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Washington, D.C. to Islip

  • Looking for a cheap flight? 25% of our users found flights on this route for $248 or less one-way and $309 or less round-trip.

Reviews of the top airline flying from Washington, D.C. to Islip

 
See real verified KAYAK customer reviews for airlines flying from Washington, D.C. to Islip. 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 Washington, D.C. to Islip? 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
7.5Entertainment
8.0Comfort
8.1Boarding
7.0Food
8.6Crew
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 Washington, D.C. to Islip

Information on your arrival and departure airports

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.