Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Hong Kong to Appleton as you normally would.
Located just 8.3 km from the city centre, Appleton Intl (ATW) is the airport most travelers will use when flying to Appleton from Hong Kong.
This is defined as Hong Kong Intl Airport (HKG) and Appleton Intl Airport (ATW). Codes like Appleton Intl Airport are often used to just call airports uniquely.