The airline has recruited Paul Moore, comms and public affairs director at global bus and train company FirstGroup. He previously worked at Virgin Atlantic Airways, where he was director of corporate affairs.
Aust leaves at the end of the month for a new job. Aust declined to divulge where he was heading, but said he would be taking up another director of comms role.
EasyJet chief executive Carolyn McCall, herself appointed this year, said of Moore: 'His experience will be extremely valuable to easyJet.'