Princess Cruises will not sail from Australia and New Zealand until next June.
The US line has extended the suspension of operations from the two countries until the end of May, 2021.
The Carnival Corporation brand cited ”uncertainty about when international travel restrictions might be lifted”.
Cancelled itineraries include sailings by Majestic Princess, Sapphire Princess and Pacific Princess, including Christmas and new year cruises.
Affected passengers will receive a 125% future cruise credit or can request a refund.
A deadline of November 30 has been set for refund requests via an online form, while the FCCs are valid against cruises departing up until May 1, 2022.
The line said: “Princess will protect travel agent commissions on bookings for cancelled cruises that were paid in full, in recognition of the critical role they play in the cruise line’s business and success.”