United face Birmingham at St Andrews on Saturday, January 9, kick off 17:30 and, if you buy your train ticket on the day, you'll pay £28.70 for an off peak return.
But if you buy now via Virgin Trains, you can get a return for £16.50.
With a 19:30 finish at the latest anticipated, it will probably take you about 30 minutes to reach Birmingham New Street from the ground.
So if you were to get the 20:20 service to Crewe and then board the 21:19 to Manchester Piccadilly, a single will cost you £6.50.
Practically every direct train from Manchester to Birmingham currently costs £10 single.
Match ticket information is here.