Go to your nearest travel agent. Look at P and O, RCI, NCL and Cunard brochures.
Or you can look all of them up on this web site.
Also Fred. Olsen & SAGA.
Use google. I put in 'cruise lines using (port name)' the following site : www.cruise-dover.co.uk/ "All cruises featured on this website are all stress free, flight free return cruises from/to the Port of Dover."
I also found the PORT site which lists the cruise lines that sail from there:www.doverport.co.uk . Click on Dover Cruise Port then click on 'cruise holidays from Dover'.
For Southampton : www.cruise-southampton.co.uk/ All cruises featured on this website are return cruises from/to the Port of Southampton and involve NO flying.
Hope this helps anyone who like me prefers, if at all possible, to avoid airports!!!