Please advise Bus #, schedules and fair from Nathan Road to Hongkong International Airport?

Well, Nathan Road is a long Road, where exactly do you refer to?
Anyway, the bus A21 is available from the Haiphong Road, Nathan Road to the airport. The bus fare is HKD33 and the travel time is about 65 mins. The bus’s service time is from 05:30 to 23:00, and it runs at an interval of 10 – 15 mins.