Alongside its newest routes, Delta continues to operate some of the longest scheduled flights in its history. According to current schedules, the airline's longest service remains the return flight from Johannesburg to Atlanta, with a scheduled block time that can exceed 17 hours, depending on winds and operational conditions. Other ultra-long-haul services include flights between Atlanta and Cape Town, Detroit and Shanghai, Los Angeles and Melbourne, Atlanta and Seoul, Detroit and Seoul, Los Angeles and Sydney, and Los Angeles and Brisbane. These flights connect major U.S. hubs directly with destinations across Africa, Asia and Australia, reducing the need for intermediate stops and providing travelers with more convenient international journeys. Scheduled flight times vary throughout the year based on weather, air traffic and routing, meaning actual flight durations may differ from published schedules.