The programme will be on general sale from September 19, with other highlights including a choice of 36 school holiday cruises, a new 30-night Canadian cruise and a new 12-night Norwegian Fjord sailing.
It also has the largest selection of year-round cruises from Southampton, as well as themed cruises such as Strictly Come Dancing and Music Festivals at Sea sailings.
Meanwhile, seven new ports are on offer across five cruises, with new destinations including Capri and Rapallo in Italy; Rovini in Croatia; Kristiansund in Norway and Gaspe, Sept Iles and Iles de la Madeleine in Canada.
P&O Cruises senior vice-president, Paul Ludlow, said: “Due to overwhelming customer demand, this is the earliest we’ve ever launched our summer holiday collection.
“Perfect for those who like to book early, in particular families, guests can now plan their holiday up to two years in advance. Plus we’re offering new customers a 5% early booking discount and past guests a 10% discount. Combine this with our lowest ever 5% low deposit offer on all new summer ‘18 holidays and there’s never been a better time to book.”
The new 2018 holidays are also being included in the Partnership’s Team “180 competition”, which offers agents the chance to win one of 180 treats, with prizes ranging from afternoon tea to a West End show with dinner, or a day at the races and shopping vouchers.
To enter, agents need to sell any new 2018 summer holiday or a cruise included in the “come celebrate with us” promotion, by September 30, 2016 and enter their booking reference and information online at www.surveymonkey.co.uk/r/POCruises180.
There is no limit to the number of entries.