ISP - WAS

$82 Find Cheap Flights from Islip to Washington, D.C. - Compare and Save

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 Washington, D.C. 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, 0 bags

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Everything you should know

Cheapest round-trip
$163
Typical prices: $399-$675
Southwest
Wed 9/16Sat 9/19
ISP - BWI • Non-stop
Cheapest one-way
$82
Typical prices: $135-$337
Southwest
Thu 10/22
ISP - BWI • Non-stop
Top airlines
Cheapest • from $163 (round-trip)
Best reviews • 8.0 score
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Flight Deals

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

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

Wed, Sep 16 - Sat, Sep 19
Southwest Logo
12:55 pm - 2:10 pm
ISP
-
BWI
1h 15mnonstop
Southwest Logo
10:55 am - 12:05 pm
BWI
-
ISP
1h 10mnonstop
$163Southwest
Thu, Aug 20 - Mon, Aug 24
Southwest Logo
12:35 pm - 1:50 pm
ISP
-
BWI
1h 15mnonstop
Southwest Logo
8:25 am - 9:40 am
BWI
-
ISP
1h 15mnonstop
$163Southwest
Wed, Sep 16 - Sat, Sep 19
Southwest Logo
12:55 pm - 2:10 pm
ISP
-
BWI
1h 15mnonstop
Southwest Logo
7:35 pm - 8:50 pm
BWI
-
ISP
1h 15mnonstop
$163Southwest
Wed, Aug 26 - Wed, Sep 2
Southwest Logo
10:55 am - 12:15 pm
ISP
-
BWI
1h 20mnonstop
Southwest Logo
9:05 am - 10:15 am
BWI
-
ISP
1h 10mnonstop
$163Southwest
Thu, Sep 17 - Sat, Sep 19
Southwest Logo
12:35 pm - 1:50 pm
ISP
-
BWI
1h 15mnonstop
Southwest Logo
7:35 pm - 8:50 pm
BWI
-
ISP
1h 15mnonstop
$163Southwest
Thu, Oct 29 - Mon, Nov 2
Southwest Logo
3:10 pm - 4:25 pm
ISP
-
BWI
1h 15mnonstop
Southwest Logo
10:20 pm - 11:30 pm
BWI
-
ISP
1h 10mnonstop
$163Southwest
Mon, Sep 14 - Wed, Sep 16
Southwest Logo
4:05 pm - 5:20 pm
ISP
-
BWI
1h 15mnonstop
Southwest Logo
7:55 pm - 9:10 pm
BWI
-
ISP
1h 15mnonstop
$163Southwest
Sat, Sep 5 - Sun, Sep 6
Southwest Logo
5:30 am - 6:45 am
ISP
-
BWI
1h 15mnonstop
Southwest Logo
3:25 pm - 4:35 pm
BWI
-
ISP
1h 10mnonstop
$185Southwest
Wed, Sep 16 - Sat, Sep 19
Frontier Logo
5:43 pm - 8:31 am
ISP
-
BWI
14h 48m
1 stop
Frontier Logo
7:09 pm - 4:58 pm
BWI
-
ISP
21h 49m
1 stop
$227Frontier
Sun, Sep 13 - Sat, Sep 19
Frontier Logo
5:43 pm - 8:31 am
ISP
-
BWI
14h 48m
1 stop
Frontier Logo
7:09 pm - 4:58 pm
BWI
-
ISP
21h 49m
1 stop
$246Frontier
Booking Insights

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

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

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

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

The cheapest return flight from Islip to Washington, D.C. costs $246 on the route between Islip (ISP) and Baltimore (BWI). It is also the most popular route.

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

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 $329 on average.

Good to know

Cheapest flight

$82
Flight from Islip to Baltimore

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

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

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

    In the last 5 days, the lowest price for a flight from Islip to Washington, D.C. was $82 for a one-way ticket and $163 for a round-trip.

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

    No, a passport isn't needed to fly from Islip to Washington, D.C.. However, local authorities might ask for an official ID.

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

    When flying out of Islip you will be using Islip Long Island. You will be landing at one of these airports: Washington, D.C. Reagan-National or Washington, D.C. Dulles Intl.

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

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

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

    The Airbus A320-100/200 is the aircraft model that flies most regularly on the Islip to Washington, D.C. flight route.

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

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

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

    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 Washington, D.C..

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

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

    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 Washington, D.C. with an airline and back to Islip with another airline.

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

    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 Washington, D.C. from Islip 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 Islip to Washington, D.C.

  • Looking for a cheap flight? 25% of our users found flights on this route for $210 or less one-way and $339 or less round-trip.

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

 
See real verified KAYAK customer reviews for airlines flying from Islip to Washington, D.C.. 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 Washington, D.C.? 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 4229 reviews
8.6Crew
8.0Comfort
7.5Entertainment
7.0Food
8.1Boarding
Airline reviews

Flight coming out of Buffalo was delayed, so we had to be rescheduled on another flight from Baltimore to Phoenix which means we had a long layover and got home 3.5 hours late. Shuttle to parking stopped at 10pm, so we had to pay for an Uber to the parking lot and got charged an extra day of parking since it was after midnight. Not the best experience. Long day!

2.0 MediocreDawn, Jun 2026
BUF - BWI
Read more Southwest reviews

Flight coming out of Buffalo was delayed, so we had to be rescheduled on another flight from Baltimore to Phoenix which means we had a long layover and got home 3.5 hours late. Shuttle to parking stopped at 10pm, so we had to pay for an Uber to the parking lot and got charged an extra day of parking since it was after midnight. Not the best experience. Long day!

We had a 5 hour delay on the tarmac in Baltimore

Airline travel is always too cramped to really be pleasant, but the cabin crew on this flight did a pretty good job of making up for it by putting on some music during boarding and sprinkling a few funny remarks into the safety briefing and announcements, and just generally being friendly and helpful. It definitely reminded me of why I prefer the in-flight experience on Southwest!

Flight was delayed due to plane not passing inspection And one of the crew had to time out and we had to wait for another one A 3 hour delay

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

It was 2 hours 45 minutes late, for no apparently clear reason.

It went well. Plane wasn't full. Will be great when assigned seating is in place

The flight was delayed about 20 minutes, but this was an evening flight, so it comes as no surprise. This flight came a good 1.5 days ahead of hurricane Helene which was still far out in the gulf. However, the flight never removed the seated buckle light. The staff announced from the beginning that due to the bad weather (I suppose the hurricane a day and a half away) they would have to do an abbreviated service with water and a snack. I am fine with their water and snack offering, but this was one of the smoothest flights I've had in years. If Southwest believes a flight like this requires everyone to remain seated, then all of their flights should remain buckled for the entire flight. I cannot help but wonder if things like this are a sneaky way to cut back on expenses since the airline is currently under a lot of pressure to reduce costs.

Although the flight was delayed, but the crew was amazing. They did the best they could to make the time enjoyable.

My experience was find with Southwest. The only issue I have is...at the exact time for me to check in...I don't understand how I always end up in C.

Everything you need to know for your flight from Islip to Washington, D.C.

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