WAS - ISP

$82 Find Cheap Flights from Washington, D.C. to Islip - 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 Washington, D.C. to Islip departing on 9/24. 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: $341-$453
Southwest
Wed 9/23Sat 9/26
BWI - ISP • Non-stop
Cheapest one-way
$82
Typical prices: $304-$380
Southwest
Thu 9/24
BWI - ISP • Non-stop
Top airlines
Cheapest • from $163 (round-trip)
Best reviews • 8.0 score
Airline reviews
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Top routes
Cheapest
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Insights
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When to travel
Cheapest • 100% price drop
Most popular
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Flight 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

Wed, Sep 23 - Sat, Sep 26
Southwest Logo
9:05 am - 10:15 am
BWI
-
ISP
1h 10mnonstop
Southwest Logo
3:15 pm - 4:30 pm
ISP
-
BWI
1h 15mnonstop
$163Southwest
Wed, Aug 26 - Thu, Aug 27
Southwest Logo
9:05 am - 10:15 am
BWI
-
ISP
1h 10mnonstop
Southwest Logo
6:10 am - 7:25 am
ISP
-
BWI
1h 15mnonstop
$163Southwest
Sat, Sep 19 - Sat, Sep 26
Southwest Logo
7:35 pm - 8:50 pm
BWI
-
ISP
1h 15mnonstop
Southwest Logo
11:55 am - 1:15 pm
ISP
-
BWI
1h 20mnonstop
$163Southwest
Tue, Aug 25 - Tue, Sep 1
Southwest Logo
9:05 am - 10:15 am
BWI
-
ISP
1h 10mnonstop
Southwest Logo
12:55 pm - 2:10 pm
ISP
-
BWI
1h 15mnonstop
$163Southwest
Wed, Sep 23 - Mon, Sep 28
Southwest Logo
9:05 am - 10:15 am
BWI
-
ISP
1h 10mnonstop
Southwest Logo
6:10 am - 7:25 am
ISP
-
BWI
1h 15mnonstop
$163Southwest
Mon, Sep 14 - Wed, Sep 16
Southwest Logo
8:25 am - 9:40 am
BWI
-
ISP
1h 15mnonstop
Southwest Logo
10:55 am - 12:15 pm
ISP
-
BWI
1h 20mnonstop
$163Southwest
Mon, Aug 24 - Wed, Aug 26
Southwest Logo
8:25 am - 9:40 am
BWI
-
ISP
1h 15mnonstop
Southwest Logo
10:55 am - 12:15 pm
ISP
-
BWI
1h 20mnonstop
$163Southwest
Wed, Sep 16 - Sat, Sep 19
Southwest Logo
9:05 am - 10:15 am
BWI
-
ISP
1h 10mnonstop
Southwest Logo
3:15 pm - 4:30 pm
ISP
-
BWI
1h 15mnonstop
$163Southwest
Tue, Aug 25 - Tue, Sep 1
Frontier Logo
11:05 am - 9:53 am
IAD
-
ISP
22h 48m
1 stop
Frontier Logo
10:57 am - 10:07 am
ISP
-
IAD
23h 10m
1 stop
$217Frontier
Sat, Aug 29 - Mon, Aug 31
Frontier Logo
12:28 pm - 7:01 pm
IAD
-
ISP
6h 33m
1 stop
Frontier Logo
10:57 am - 10:07 am
ISP
-
IAD
23h 10m
1 stop
$229Frontier
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.

How much is a round-trip flight from Washington, D.C. to Islip, New York?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Washington, D.C. to Islip, New York departing in August.

Flight prices are below average for this route right now.

Flights to Islip, New York from Washington, D.C. usually cost between $289 and $451 in August.
The lowest price found in the past 5 days was $163 on Southwest (Aug 24-Aug 26).

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

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

The cheapest return flight from Washington, D.C. to Islip costs $283 on the route between Baltimore (BWI) and Islip (ISP). It is also the most popular route.

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 February, where tickets cost $0 (return) on average. On the other hand, the most expensive months are October and April, where the average cost of round-trip tickets is $889 and $633 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.

No, with an average price for the route of $505, prices are generally cheapest when you fly direct.

Good to know

Cheapest flight

$82
Most popular time to fly and prices are also 17% lower on average.
Flight from Baltimore 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 5 days, the lowest price for a flight from Washington, D.C. to Islip was $82 for a one-way ticket and $163 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 MAX 8 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 $278 or less one-way and $381 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 4228 reviews
8.1Boarding
7.0Food
8.6Crew
7.5Entertainment
8.0Comfort
Airline reviews

Had a great flight. Delayed takeoff, but comfortable. Snacks were good.

10.0 ExcellentMelissa, Mar 2026
MSY - LGA
Read more Southwest reviews

Had a great flight. Delayed takeoff, but comfortable. Snacks were good.

Pretty seamless, just a tad bit late in taking off and landing.

Haven’t flown on SW in years. Flight was on time departing and arriving. Served vegan butter onion flavored pretzels which were bad. Coke served was in a tiny paper cup. Crew was not engaging. Felt like they were going through the motions. Old plane, tight seats and no leg room.

No delays and arrived to destination 30 min early. Staff was super friendly.

after landing, we stay 2 hours on the taxi way before reaching the gate The airline and the crew were good though

My flight to Chicago left and landed early. My return flight left two minutes late and arrived 2 minutes late. My seat selections were ideal! There were no snacks going to Chicago and no snacks on the return trip. There are no charging outlets on board.

Gate agents were informative and friendly… flight attendants were as well. Had a fun time chatting about their legacy AirTran experiences as a former fan of the airline that Southwest acquired.

Pretty standard flight. We left late, but arrived early. The wifi entertainment is always nice. The free snacks and beverages are simple, but appreciated. I'm tall and the seats are an issue. I can deal with a short flight, but any longer, I have to find another airline where I know beforehand I have extra legroom.

Awesome experience. No in-flight video or meal. Still do not like the boarding process.

On time, good crew, easy flight. Just like the old days!

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

Information on your arrival and departure airports