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C$158 Cheap Flights from Washington D.C. (WASA) to Islip (ISP)

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Flight deals from Washington D.C. to Islip

Looking for a cheap last-minute deal or the best return flight from Washington D.C. to Islip Airport? If you want to travel next month, return fares start from C$432. Find the lowest prices on one-way and return tickets right here.
Islip.C$158 per passenger.Departing Wed., Sep. 16.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Baltimore Washington International on Wed., Sep. 16, arriving in Islip.Price includes taxes and charges.From C$158, select.
Islip.C$189 per passenger.Departing Fri., Jul. 17.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Fri., Jul. 17, arriving in Islip.Price includes taxes and charges.From C$189, select.
Islip.C$190 per passenger.Departing Tue., Aug. 4.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Baltimore Washington International on Tue., Aug. 4, arriving in Islip.Price includes taxes and charges.From C$190, select.
Islip.C$191 per passenger.Departing Wed., Jul. 15.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Baltimore Washington International on Wed., Jul. 15, arriving in Islip.Price includes taxes and charges.From C$191, select.
Islip.C$239 per passenger.Departing Sat., Jun. 27.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Baltimore Washington International on Sat., Jun. 27, arriving in Islip.Price includes taxes and charges.From C$239, select.
Islip.C$264 per passenger.Departing Sat., Jun. 27.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Baltimore Washington International on Sat., Jun. 27, arriving in Islip.Price includes taxes and charges.From C$264, select.

Find the cheapest month to fly from Washington D.C. to Islip

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Washington D.C. to Islip flights are currently cheapest in September.
Jun.
from C$239
Jul.
from C$189
Aug.
from C$190
Sep.
from C$158
Oct.
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Nov.
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Dec.
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Jan.
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Feb.
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Mar.
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Apr.
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May
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Which airlines fly from Washington D.C. to Islip?

Washington D.C. to Islip: Alternative routes

Compare routes from Washington D.C. to Islip below. You may find an airport to fly into that's cheaper, faster, or easier than Islip.

Islip

12km from central Islip
Closest
from C$158
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Bridgeport

49km from central Islip
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New York John F. Kennedy

49km from central Islip
from C$107
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Westchester County

56km from central Islip
from C$230
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New York LaGuardia

56km from central Islip
Cheapest
from C$104
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New Haven

65km from central Islip
from C$116
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New York Newark

81km from central Islip
Cheapest
from C$104
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Washington D.C. to Islip: Flight information

The things to know before you go.
Cheapest flight foundC$158
Cheapest month to flySeptember
Average flight time1 hr, 11 mins
Most popular airlineSouthwest Airlines
Average flights per week29

Finding cheap flights from Washington D.C. to Islip: Frequently asked questions

The best price we found for a return flight from Washington D.C. to Islip is C$370. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
1 hour and 11 minutes is the average flight time from Washington D.C. to Islip.
Southwest Airlines flies direct from Washington D.C. to Islip.
As of June 2026, there are 29 flights per week flying from Washington D.C. to Islip.
The cheapest month to fly from Washington D.C. to Islip is usually October.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Washington D.C. to Islip Airport on Thursday, October 1, 2026.
Yes – the average flight time is 1 hour and 11 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Islip but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Islip is around 40 days in advance, so don’t leave your flight to the last minute.

Travelling from Washington DC to Long Island MacArthur Airport (ISP): what you need to know

  • Begin your trip planning by checking out the departure points for your flight from Washington DC to Long Island MacArthur Airport (ISP). Explore the options for leaving from Ronald Reagan National Airport (DCA) or Washington Dulles International Airport (IAD), two of the city's main airports.

  • Islip's timezone is UTC-4, which is the same as Washington DC. Long Island MacArthur Airport is located in Islip.

  • With 39 direct weekly flights between the two airports, Ronald Reagan National Airport (DCA) to Long Island MacArthur Airport (ISP) is the busiest route. Southwest Airlines operates the earliest flight at 08:05. If you'd like to get more out of your day before you fly, the last flight from DCA to ISP is with Southwest Airlines at 22:55.

  • Arrive at the airport on time so you don't miss your flight from Washington DC to ISP. Be there at least two hours ahead for international flights and an hour early for domestic departures to skip the mad dash to your gate.

  • Peak months like July or high seasons such as Christmas and New Year will mean bigger waits at check-in and security. If you're travelling then, play it safe and get to the airport even earlier. Arriving two hours before a domestic flight and up four hours ahead of an international flight is a wise move.

Airports in Washington DC

Ronald Reagan National Airport (DCA)

  • From the centre of Washington DC, DCA is approximately 8 kilometres away. Use navigation apps or check the official airport website to find the best way to reach the terminal.

  • Planning to catch an early flight from Washington DC to Long Island MacArthur Airport? Avoid the last-minute rush to the terminal (and get some extra shut-eye) by picking one of these stays near Ronald Reagan National Airport:

Washington Dulles International Airport (IAD)

  • Washington Dulles International Airport (IAD) operates nonstop flights from Washington DC to Long Island MacArthur Airport (ISP).

  • On public transport, you can travel from central Washington DC to IAD in around 3 hours and 26 minutes. The airport is roughly 56 kilometres away, and getting there by car will take approximately 51 minutes.

  • It's your vacation, so why not extend it with another night away? Consider checking in to one of these hotels near Washington Dulles International Airport the day before your flight from Washington DC to ISP:

About Long Island MacArthur Airport (ISP)

Getting from Long Island MacArthur Airport (ISP) to central Islip

  • From Long Island MacArthur Airport, Islip is approximately 16 kilometres away. It takes around 17 minutes to reach the centre driving.

  • If you're taking public transport, expect a journey of roughly 1 hour and 11 minutes.

How to find the cheapest flights from Washington DC to Long Island MacArthur Airport (ISP)

  • Book a one-way ticket from Washington DC to Long Island MacArthur Airport from C$158 or travel return from just C$370. Fares listed are subject to change and may differ when you make your booking.

  • We recommend booking as soon as you can to secure flight tickets from Washington DC to ISP. You're more likely to score a great deal and have more options for departure times and dates.

  • If you're flexible with your travel dates, try using the 'Whole month' tool. It'll show you the cheapest price across each month when searching for your ticket from Washington DC to Long Island MacArthur Airport.

  • Log into your online account or use the app to set up a Price Alert. You'll get notified right away if there's a deal you can't miss. It's easy to do, and it'll save you the hassle of looking for a cheap ticket from Washington DC to ISP every day.

  • Tailor your trip with filters. Select your ideal arrival and departure times, airlines and total journey duration. You can also sort results by 'Fastest,' 'Best' or 'Cheapest' flights from Washington DC to Long Island MacArthur Airport.

The best time to fly from Washington DC to Long Island MacArthur Airport (ISP)

  • May is the quietest time to fly to Islip. Alternatively, join the crowds and take your trip in August. This is the most popular month for flights from Washington DC to Long Island MacArthur Airport, but the best time to go is up to you.

  • The warmest month in Islip is July, with temperatures ranging between 19ºC and 29ºC. Book your flights from Washington DC to ISP in this month if this is the type of weather you enjoy.

  • Search for cheap flights from Washington DC to Long Island MacArthur Airport in January if you like cooler conditions. Temperatures are at their lowest then, ranging between -4ºC and 8ºC on average.

More about Islip

Plan the rest of your trip from Washington D.C. to Islip

Prices shown on this page are estimated lowest prices only. Found in the last 12 days.