Cruise only means you are paying for the cruise - you do not get flights and do not get transfers to/froom the port.
As an extra to "Aldrich, Newbury" ( so impersonal that, sorry but no option) you will normally find that whoever is offering a Cruise Only deal will be able to give you a reasonable deal on flights as well or you can arrange your own but remember that if you do you must allow sufficient time to allow for any delay in flying which can occur. You will have to pay for transfers to and from the port and that can prove expensive on some occasions but often is quite cheap....Nei.
I thought cruise only means sailing from a port like southampton if your cruise is from uk maybe im wrong.
No, sorry Mr McGuire, incorrect this time. Cruise only is from any port anywhere in the world and means that you are only being charged for the cruise itself and nothing before or after it regards Nei.