Nicole's daughters Sunday Rose, 10, and Faith Margaret, 7, headed for the departure lounge with dad Keith Urban.
The Oscar-winning actress, who is notoriously vigilant about protecting her children's privacy, was not pictured.
Dressed neatly in a pretty leopard print dress and tan ankle boots, Sunday looked a dead ringer for her famous country singer father but appeared to have her movie star mother's height and slender frame.
Little sister Faith wore a wide neck floral frock and black cowboy boots - the same outfit the youngster wore for a church outing with her parents on January 27.
The famous family has been making the most of the summer season Down Under since the beginning of the year.
Nicole and Keith were spotted at the Australian Open with Vogue editor-in-chief Anna Wintour and also made appearances at the ARIA and AACTA Awards.
Nicole looked stunning at the Sydney premiere of her latest project Destroyer, while Keith managed to fit in a tour of Oceania during their vacation.
Seemingly more in love than ever, the duo were also photographed enjoying some down time at locations like Sydney's Maroubra Beach, Palm Beach and even KFC.