Flight
General Mitchell International Airport in Milwaukee is a little over an hour drive to Fond du Lac.
Flight
Appleton International Airport is significantly smaller than MKE, but does have some options when flying on Allegiant from Phoenix. Appleton is about a 45 minute drive to Fond du Lac.
Flight
Flying into Madison is also an option. It's about an hour drive from Madison to Fond du Lac.
Travel Note
Both General Mitchell and Appleton Airports have rental car options.
Hotel
House Or Rental
Airbnb offers many vacation rental options in and around Fond du Lac.