United’s new 787-9 Dreamliner allows it to fly nonstop to faraway places like… (Photo: United) On June 1, United Airlines will introduce what it says is the longest scheduled Boeing 787 flight in the world. Measured by distance it will also be the longest scheduled flight by any U.S. carrier, beating out Delta’s Atlanta-Johannesburg nonstop. It will be longer than United’s current longest flight between Los Angeles and Melbourne, Australia. At 8,446 miles each way, it will be the longest flight from San Francisco International Airport, swiping that superlative from Etihad’s nonstops to Abu Dhabi.