ISP - WAS

$107 Find Cheap Flights from Islip to Washington, D.C.

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 7/29. 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 Washington, D.C.

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Islip to Washington, D.C., 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 Washington, D.C., as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$275
Typical prices: $562-$381
Southwest
Tue 6/30Tue 7/7
ISP - BWI • Non-stop
Cheapest one-way
$107
Typical prices: $214-$409
Frontier
Wed 7/29
ISP - BWI • 1 stop
Top airlines
Cheapest • from $275 (round-trip)
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Top routes
Cheapest
Most popular
Insights
Insights
Insights
Insights
When to travel
Cheapest • 100% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
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We hope you love your trip to Washington, D.C.!
Flight Deals
Booking Insights
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.

Tue, Jun 30 - Tue, Jul 7
Southwest Logo
4:40 pm - 5:55 pm
ISP
-
BWI
1h 15mnonstop
Southwest Logo
9:20 pm - 10:40 pm
BWI
-
ISP
1h 20mnonstop
$275Southwest
Sat, Aug 15 - Wed, Aug 19
Southwest Logo
3:15 pm - 4:30 pm
ISP
-
BWI
1h 15mnonstop
Southwest Logo
3:45 pm - 4:55 pm
BWI
-
ISP
1h 10mnonstop
$290Southwest
Sat, Sep 5 - Sat, Sep 12
Southwest Logo
11:55 am - 1:15 pm
ISP
-
BWI
1h 20mnonstop
Southwest Logo
10:55 am - 12:05 pm
BWI
-
ISP
1h 10mnonstop
$305Southwest
Sat, Aug 1 - Mon, Aug 3
Multiple Airlines Logo
11:57 am - 8:54 am
ISP
-
BWI
20h 57m
2 stops
Multiple Airlines Logo
11:30 am - 7:01 pm
BWI
-
ISP
7h 31m
1 stop
$318Multiple Airlines
Fri, Jul 31 - Mon, Aug 3
Multiple Airlines Logo
2:28 pm - 3:34 pm
ISP
-
BWI
25h 06m
2 stops
Multiple Airlines Logo
11:30 am - 7:01 pm
BWI
-
ISP
7h 31m
1 stop
$321Multiple Airlines
Wed, Jul 29 - Tue, Aug 4
Frontier Logo
10:57 am - 12:23 am
ISP
-
BWI
13h 26m
1 stop
Frontier Logo
9:37 pm - 7:01 pm
BWI
-
ISP
21h 24m
2 stops
$324Frontier
Tue, Jun 23 - Thu, Jun 25
Southwest Logo
12:25 pm - 1:40 pm
ISP
-
BWI
1h 15mnonstop
Southwest Logo
7:10 am - 8:20 am
BWI
-
ISP
1h 10mnonstop
$328Southwest
Mon, Jun 15 - Fri, Jun 19
Frontier Logo
9:52 pm - 9:01 am
ISP
-
BWI
11h 09m
1 stop
Frontier Logo
9:30 pm - 8:57 pm
BWI
-
ISP
23h 27m
1 stop
$334Frontier
Sat, Aug 15 - Wed, Aug 19
Multiple Airlines Logo
11:57 am - 3:34 pm
ISP
-
BWI
27h 37m
2 stops
Multiple Airlines Logo
10:34 am - 7:05 pm
BWI
-
ISP
8h 31m
1 stop
$338Multiple Airlines
Sat, Sep 5 - Wed, Sep 9
JetBlue Logo
1:50 pm - 7:59 pm
ISP
-
DCA
6h 09m
1 stop
JetBlue Logo
6:00 am - 1:05 pm
DCA
-
ISP
7h 05m
1 stop
$426JetBlue
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.

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

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

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 $316 on the route between Islip (ISP) and Baltimore (BWI). It is also the most popular route.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Islip to Washington, D.C., 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 Islip to Washington, D.C. is February, where tickets cost $0 (return) on average. On the other hand, the most expensive months are July and August, where the average cost of round-trip tickets is $766 and $766 respectively.

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

Low seasonDecember
Cheapest flight$107
Best time to beat the crowds with an average 45% drop in price.
Most popular time to fly and prices are also 26% lower on average.
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 $107 for a one-way ticket and $275 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, Delta, Alaska Airlines, and American Airlines 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 $203 or less one-way and $381 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 4255 reviews
7.0Food
7.5Entertainment
8.1Boarding
8.0Comfort
8.6Crew
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!

Was fine, delayed and feels like southwest is always late

I don't know why flying out of Sarasota requires two plane changes.

The first time I flew in the extra legroom section. It was difficult to notice a difference. I had bad luck with my neighbors. The crew was okay. Southwest has reduced the live TV options.

The flight was smooth. The Southwest experience has degraded overall, but this one was okay.

No gluten free snacks. Seats felt worn or bare bones even though it was a new 737 MAX 8.

One major problem that was very unprofessional and uncalled for. Plane landed and we had to wait 20 minutes to get off the plane since they were waiting for someone to come to the gate to drive the jetway. Southwest couldn't have someone available and waiting for the plane to land? Is there only one person in Hobby airport who knows to drive the jetway? Was he at lunch? In the bar? Uncomfortable and uncalled for!

The checking experience in Orlando was terrible, almost missed the flight. Too many travelers and Southwest completely understaffed.

I'm glad it wasn't only 75% full because I could get a good seat

if I was good. Not happy that I have to pay extra money to get the seat I need for lake room, but I guess that’s a sign of the times.

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

Information on your arrival and departure airports