Originally Posted by
stu52
There's only been one mention of the bus from Piazzale Roma to the airport. It takes about 30 mins and is way cheaper than the water taxi.
Agreed - the bus is absolutely the cheapest option.
Until we hear back from the OP re: (a) how much luggage is involved and (b) where the ship will be docked (presumably Tronchetto) it is difficult to know if Piazzale Roma is an option or not.