16 Hours Nonstop: San Francisco to Saigon, Vietnam on Vietnam Airlines
Vietnam Airlines flies from San Francisco to Saigon, Vietnam, three times a week on an Airbus A350-900, with a flight time of 16 hours and 30 minutes.
13 Hours Nonstop: Salt Lake City to Seoul, Korea on Delta Air Lines
Delta Air Lines operates this 13-hour-and-15-minute flight from Salt Lake City to Seoul, Korea, daily on an Airbus A350-900, beginning in June 2025.