Users have found that booking a flight from Washington Dulles Intl to Islip at least 60 days early can save you up to 27% on average compared to booking a flight this week. If booking 60 days before your flight isn’t an option for you, users have found flights from Washington Dulles Intl to Islip for as little as $263 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $320 for flights departing within the next 3 days.
Flights from Washington Dulles Intl to Islip lean towards being more expensive in July. Prices are generally better when you fly from Washington Dulles Intl to Islip in February, with the cheapest ticket starting at $124.
It’s typically best to fly out from Washington Dulles Intl to Islip in the morning. Doing so could potentially save you 13% on the flight price compared to flying in the noon, which is usually more expensive.