Find Your Cruise
Has the T/A booked the whole package with Celebrity or have they booked your flights independently? If the former then you will be on early flight out of LGW - it is not guaranteed to be direct - and on arrival at Rome you will be taken by coach to the ship which is about 1hr20 min drive. You should be on board early afternoon. If flights are booked through Celebrity then if the flts are late it is their responsibility to get you to the ship at no cost to you.