Riviera will sail from Istanbul starting 18 October, picking up its scheduled Mediterranean voyages before sailing a series of Caribbean voyages from Miami over the winter.
Insignia will resume sailings on 21 December with a Panama Canal voyage from Miami. It will then embark on a sold-out 180-day around the world cruise from Los Angeles to New York.
Finally, Sirena will re-enter service on 22 January 2022 sailing a Caribbean voyage from Miami to Panama City.
Itineraries could yet undergo changes owing to port availability, Oceania has said.
It comes after Oceania confirmed last month Marina would resume cruise operations from Copenhagen in late August.
Phased restart dates for Regatta and Nautica will be announced at a later date.
Until further notice, all Oceania cruises will operate with a 100% crew and guest vaccine requirement.
