Prince William has reportedly expressed a desire to keep his upcoming trip to Australia and New Zealand as "informal" as possible.

According to the NZ Herald newspaper Prince William wants to keep his visit to disaster-stricken areas of New Zealand and Australia as informal as possible.

He is due to visit earthquake-devastated New Zealand on March 17 and 18, then travel to areas of Australia hit by a cyclone and floods from March 19 to 21, including Queensland state.

Queensland Premier Anna Bligh said the prince wanted an opportunity "to really sit down and talk with some of the people that have been directly affected."

"He wants to be as informal as is reasonable - I don't think that's very easy when you're the prince - but he does want an opportunity to be pretty informal and get close to people."

Prince William's itinerary is yet to be finalised but he is also expected to visit communities in southeastern Australia as they recover from devastating flooding in January.

The visits, which comes just over a month before his April 29 wedding to Kate Middleton, followed invitations from New Zealand Prime Minister John Key and his Australian counterpart Julia Gillard, St James's Palace said on Wednesday.