The royal couple, along with Prince George, will fly to Australia via New Zealand, landing on April 16th.
Buckingham Palace has now released the itinerary showing Prince William and the Duchess will attend the Easter Day service at St Andrew's Cathedral in Sydney and sign the First Fleet Bible.
Archbishop of Sydney Glenn Davies, who will preach at the service, said he will be "delighted to welcome the royal couple to the celebration of Easter at the Cathedral church of St. Andrew."
The couple will also visit Brisbane, Uluru and Canberra.
On Anzac Day, Prince William will lay a wreath during a Commemorative Service at the Australian War Memorial and plant a Lone Pine tree, the seed of which came from Gallipoli in the Memorial Garden.