Airport bosses have vowed to work round-the-clock to make flight arrangements and assist travellers, as the Hong Kong International Airport is expected to remain busy throughout the night and the next day amid a backlog.

Chris Au Young, the Airport Authority's general manager of terminal and passenger experience, said about 400 flights that had been rescheduled would either depart or arrive at the SAR on Sunday as Typhoon Wipha moves away from the city.

"We have been spoken with the Civil Aviation Department and various airlines on arranging flights overnight and deploying additional staff to handle the departure procedures for passengers. All 27 of our security checkpoints at departure will be fully operational to serve passengers overnight," he said.

"Due to the continued inclement weather, we expect the resumption of flights to continue until Monday evening."

The authority also aimed to resume all 500 cancelled flights, affecting about 100,000 passengers, in two to three days, Au Young added.

Among those stranded was a visitor from Ningbo, who told RTHK she would stay at the airport to wait for her flight that was delayed until Monday morning.

She said she failed to secure train tickets to leave the SAR "four or five times".

"We were going to go out for a stroll, but now that we couldn't, we would just wait here," she said. "When we woke up this morning, we were told that our train had been cancelled, so we booked a flight."

Another traveller was supposed to travel with her family to Seoul at noon, but the flight was cancelled.

"We booked a second flight, which was delayed," she said. "We had taken leave and hoped to travel with the entire family. There's no reason for us to cancel [this trip]."