P&O Cruises is offering free cabin upgrades in March on a selection of 67 cruise holidays on all seven ships in the fleet, departing between June and December 2012.

The Ultimate Upgrade promotion is valid on bookings made throughout March, and entitles customers to a higher grade cabin at a lower grade price.

A nine night Atlantic Coast cruise on board Oceana, departing from Southampton on May 25, 2012, and calling in Gibraltar, Casablanca, Cadiz, Lisbon and Vigo, now has the following pricing:

Was Now
Inside cabin £949 £949
Outside cabin £1,259 £949
Balcony cabin £1,429 £1,259
Mini-suite £2,339 £1,429
Suite £2,869 £2,499

All cruises in the promotion depart from Southampton and are between two and 35 nights in duration, to a choice of destinations such as the Mediterranean, Baltic, Canary Islands, Caribbean, USA and Canada, Norwegian Fjords, Iceland, and Around Britain.

P&O Cruises managing director, Carol Marlow, said: “Customers booking in March will receive a fantastic value cruise holiday, offering the kind of cabin that may normally not be affordable for an even better cruise experience. This summer or autumn you could be enjoying a stunning view of the fjords from your balcony or toasting the Caribbean sunset from a suite; all for less than expected, thus highlighting the unbeatable value for money offered by a cruise holiday.”