Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Bangkok to Appleton as you normally would.
Appleton Outagamie County (ATW) is the airport you will fly into if you book a flight from Bangkok to Appleton. You should not have trouble finding flights to Outagamie County from Bangkok; the airport handles an average of 0 inbound flights from Bangkok per day. You should also have plenty of airline options to choose from since 0 airlines have flights to the Appleton airport from Bangkok. It is only a 8.3 km journey from Outagamie County (ATW) to Appleton’s city centre.