Under the new measures, Austrians will be asked to work from home and non-essential shops will close. Restrictions will continue until 11 December but will be reassessed after 10 days.
A spokesperson for the operator said: "Where customers are affected by any programme changes, we have been repeatedly recognised by independent travel agents for how we have handled this, and all affected trade bookings will be cancelled with a relevant refund.
"For bookings due to travel to Vienna after 1 December, we will provide a further update ahead of then.
"We would like to thank independent travel agency partners for their continued patience and understanding."
It will be a legal requirement for Austrian citizens to be vaccinated from 1 February.
