Treviso Airport is a small airport located about 40 km from Venice. This means you'll need to take a shuttle to Venice. Whenever a flight lands, a public transit bus will take you ATVO to Venice for the Piazzale Roma. The price is 14 € per person per trip.
Treviso Airport

The ATVO

Please note that the bus stops in front of the airport building and is NOT always white, as shown here. The only important thing is the sign with the name on it. ATVO. The buses are air-conditioned. There is „free Wi-Fi“ on board the buses. The buses have ample luggage space.
ATVO Bus: Travel Time

The ATVO A bus will be waiting for you in front of the building and will take you to Venice in about 70 minutes to the Piazzale Roma. It also stops at the train station in Mestre along the way.
The Route to Venice

The plan is from https://www.OpenStreetMap.org © OpenStreetMap contributors.
Treviso is located about 42 kilometers north of Venice. The bus also stops at the main train station in Mestre.
The Bridge to Venice

Venice is connected to the mainland by a bridge that is about 4 km long and 1 meter high. The ATVO Bus to Venice.
Piazzale Roma

Venice is an island located in the lagoon of the northern Adriatic Sea. After crossing the „Ponte delle Libertà“ bridge, you’ll come to the Piazzale Roma. This is the city's bus station. No further than the Piazzale Roma NO buses and NO cars are allowed. Here, you must take a water bus (Vaporetto) to transfer to another line to get close to your hotel.
ACTV: Public Transit in Venice

Public Transit ACTV In Venice, water buses (Vaporetto) took place. Starting on Piazzale Roma It's best to take Line 1 or Line 2 to a stop near your hotel.