Flight UA38 departs Singapore's Changi Airport at 11:00 a.m. daily, arriving the same day at Los Angeles International Airport at 11:15 a.m. Singapore time. The flight is around 15 hours 15 minutes long.
The returning flight UA37, departs LA at 9:25 p.m. Singapore time, and arrives in Singapore at 6:20 a.m. 2 days from departure. It's more than 2 hours longer than the flight from Singapore at 17 h 55 min.
The 14,000 km journey is the longest nonstop flight in the world to or from the United States.
Both of United Airlines' San Francisco and Los Angeles routes are operated via Boeing 787-9 Dreamliner aircraft which can accommodate up to 250 passengers.
United is the only airline to operate a direct flight between Singapore and LA.