Hong Kong flag carrier Cathay Pacific said it would cancel all flights to and from the city from Sunday onwards until further notice.
Cathay Pacific flights in and out of the city will be cancelled from 6:00 pm (1000 GMT) Sunday, the airline said, adding that services will gradually resume on Monday “if weather conditions permit”.
Dragonair, a sister airline, will halt flights for the same period.
The Airport Authority was reported as stating that 376 flights would be cancelled.
Usagi, packing sustained winds of 240 kilometres per hour (150 miles per hour) with gusts of nearly 300 kilometres per hour, brought torrential rain and strong winds to the Philippines and Taiwan on Saturday.