As of August 2010 Santon Downham is served by only one real bus service following the demise of the 333 service.

200 Thetford - Brandon - Lakenheath - Beck Row - Mildenhall

201 Thetford - Brandon - Lakenheath - Mildenhall

Note the No 40 is shown - this is a school bus.

You can find an interactive travel planner and timetables at Travel Line East Anglia