If not going by supporters bus, you can get a an express bus from Buchanan Street leaves at 12.50 [stance4] going to Leven [ stops in Cumbernauld] .Get off at Falkirk Forth Valley Hospital arrive 13.20, then take bus going to Alva at 13.34 this stops outside the ground at 14.04.
Return , Leave outside ground at16:55 arrive Forth valley hospital17.25, Glasgow express leaves hospital 17.42 arrives Glasgow18.12
Per travel line