The Duke and Duchess of Cambridge are expected to return home to Anglesey after spending 48 hours at a secret location.
The newlyweds have been enjoying a quiet weekend away in the UK after postponing their overseas honeymoon.
Clarence House denied reports of security concerns over the honeymoon, with a spokeswoman saying: "There was no last-minute change of plan."
Delaying their departure may give the couple more chance of slipping away unnoticed.
William will be back at work in his job as an RAF search and rescue helicopter pilot.
A Ministry of Defence spokesman said: "The chances are if he's back at work on Tuesday he'll be getting in to Anglesey on Monday evening. It will be a normal day at work for him after the wedding, nothing special planned."
Meanwhile, members of the public are to be given the chance to see the intricate design of Kate's wedding dress up close. Clarence House said plans were being drawn up to put the gown - designed by Sarah Burton for Alexander McQueen - on public display.
A spokeswoman said: "The Duchess of Cambridge is considering a number of options to give members of the public the opportunity to see close up the skilled British craftsmanship that went into the making of her wedding dress by Sarah Burton and her team as well as the Royal School of Needlework."
It is not known exactly when or where it will appear. But a number of gowns worn by Diana, Princess of Wales, went on display at Kensington Palace.
Speculation has been mounting about where the newlyweds could spend their time away when they jet off on honeymoon. The Duke is known to have a deep affection for Africa and would be on safe romantic territory if he chose to take his wife to Kenya, where he proposed to her last year. But a holiday on a Caribbean island is favourite with the bookies with odds of 8/15.