Santa Lucia train station - ©UCityGuides.com
There are as many people arriving in Venice by train from elsewhere in Italy, as by plane. If you're heading to the city by train, you'll arrive at Santa Lucia station. It's right in the center of the city, facing the Grand Canal, and from there you can walk to almost anywhere.
Marco Polo International Airport
From Venice's Marco Polo International Airport you may take the ATVO bus (departing around every 20 minutes) to the historic city center, right by the main canals. You may also take a taxi, which reaches Piazzale Roma in 15 minutes, or choose the more expensive water taxi. Another option is to book a transfer (see below).
ATVO airport bus website: www.atvo.it
Treviso San Giuseppe Airport
Many low-cost flights also fly to Treviso San Giuseppe Airport, from where you need to take an ATVO bus to reach the city, taking about 1 hour and 10 minutes (it departs at irregular intervals; see the ATVO link above for the schedule).
Transfers from the Airport
If you don't wish to rely on public transportation and prefer the convenience of a transfer, here are your options:
Venice is to be explored on foot, but if you need to cross any of the canals fast, take one of the Vaporettos (water buses). Number 1 can actually be taken as a touristic ride, as it travels along the Grand Canal.
To go elsewhere by car, check the cheapest rental rates: