Bus Airport - Treviso city :
- To Treviso : the bus stop is about 50 m to the right when exiting from the terminal; it's bus 6, which stops at the railway station and goes on through the town. From the airport to the station, it takes some 15 minutes if the traffic is normal; more, as usual, at the rush hours.
- To the airport : same stop near the station - buy a ticket at the tabacchi of the station - it takes some 10 minutes more than the other way.
http://www.actt.it/trasportipubblici.php?page=1118744554
Bus Airport - Venice :
- the coaches to Venice wait just in front of the terminal, some of them stop at Mestre railway station (inquire). Buy the tickets in the arrival hall.
- At Venice, the stop is on Piazzale Roma, across the canal from the railway station.
Price is 5 euros single, 9 euros return (valid 7 days). It can take about 1 hour, sometimes more, according to road traffic.
http://www.atvo.it/orari/pdf_airport/Ryanair.pdf