From Hub's Summer 2020 Update (Dated June 9)
Across the Pacific we will grow our Tokyo service including the addition of Haneda (HND) from Chicago O'Hare (ORD), and will also resume service to Seoul (ICN),
Hong Kong (HKG), and Singapore (SIN) which will be served via a flight from Hong Kong (HKG), pending government approvals
San Francisco Hong Kong - Singapore* 5x/weekly
https://hub.united.com/united-summer...646143797.html