To save up to 136% on this flight, we recommend booking at least 58 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Washington, D.C. Dulles Intl Airport to Islip, New York from $248 1-2 weeks out and tickets from $373 for flights departing within the next 72 hours.
October is one of the best times of the year to fly to Islip, New York from Washington, D.C. Dulles Intl Airport. Prices for October average $213 per person but you can even find prices for as low as $113. The most expensive prices can be found in the month of May. Opting for a October flight can save you 11% on your journey compared to booking in May
When flying from Washington, D.C. Dulles Intl Airport to Islip, New York, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
Fly from
Fly to
Budget
$545 - $628
Route
Depart
Return
Price
Washington, D.C. Dulles IntlIslip Long Island
IAD - ISP
IADISP
Washington, D.C. Dulles Intl
Thu 7/11
3 stops21h 19m
Islip Long Island
Sun 7/14
2 stops20h 25m
Washington, D.C. Dulles IntlIslip Long Island
IAD - ISP
IADISP
Washington, D.C. Dulles Intl
Thu 6/20
3 stops16h 39m
Islip Long Island
Mon 6/24
3 stops25h 42m
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