Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Aberdeen to Oshkosh as you normally would.
Aberdeen Dyce (ABZ) is the airport you will fly out of if you book a flight from Aberdeen to Oshkosh. You should not have trouble finding flights to Oshkosh from Dyce; the airport handles an average of 0 outbound flights to Oshkosh per day. You should also have plenty of airline options to choose from since 0 airlines have flights from the Aberdeen airport to Oshkosh. It is only a 5.3 mi journey to Dyce (ABZ) from Aberdeen’s city center.