They exist from Brisbane Airport (BNE), Melbourne Airport (MEL), Perth Airport (PER), and Sydney Kingsford Smith Airport (SYD). Qantas' Longest Nonstop Flights In AugustCredit: ShutterstockAs usual with such articles, the maximum block time was used to determine Qantas' longest nonstop services in August. Nonstop service to LHR is due to return in February 2027, while nonstop flights back to Western Australia continue to operate. With a maximum block time of 17 hours and 40 minutes back to Victoria, the leg is currently Qantas' longest nonstop offering. Usually, nonstop flights from PER to LHR would rank first.