What is the longest flight in the world? The world's longest scheduled passenger flight is Singapore Airlines Flight SQ23, which flies from Singapore to New York. This nonstop flight spans many time zones and continents in a single journey, connecting Southeast Asia to the East Coast of the United States. It tests even the most experienced passengers, with an average flight duration of about 19 hours. This route's Airbus A350-900ULR aircraft is designed to maximize passenger comfort and fuel efficiency while providing improved room, lighting, and air quality.