Buying Tickets for The Last Supper
The debut of the Da Vinci Code movie brought out the conspiracy seekers in droves. Only 20-25 people can see the work at one time, for a maximum of 15 minutes. Only if people don't show up will you be able to stand in line and hope to get a ticket. Tickets can be booked two months in advance but sell out quickly. Visitors must be dressed in appropriate attire for entering a church.
Last Supper tickets can be ordered online from Select Italy. Available dates and times are shown so you can choose one that fits your schedule and get a guaranteed ticket. If you don't find a date and time that is good for you, there is an option to place a request and Select Italy will try to find tickets for you.
Another company, Last Supper Tickets, makes some last minute tickets available for purchase a few days ahead. There's a large booking fee but the price includes English commentary during your visit. If you're looking for last minute tickets, check their site for available dates and times.
If you have a hotel already, you might try contacting them to see if they can get tickets for you.
Note: Cenacolo Vinciano is no longer selling tickets online.