Wanted to know, What is the longest flight in the world? The nonstop flight operated by Singapore Airlines from Singapore (SIN) to New York (JFK) is the longest in the world. Approximately 9,537 miles are covered in 18 to 19 hours of flight time. For maximum comfort, it provides first-rate economy and business class seats on the fuel-efficient Airbus A350-900ULR. For business and leisure travelers looking for a smooth trip, this flight is perfect because it avoids layovers. Future developments could significantly increase flight time as carriers compete.