It’s easier to get back to Altrincham then to get to Manchester but it will take a long time - although probably no longer than trying to get out of a carpark
If you’re driving to the match, you may want to consider driving to Altrincham - there’s a car park by the station and getting the tram there. It takes about 15 minutes to get to Old Trafford - you’d spend a lot longer on the A56 going through Altrincham, Sale and Stratford to get there.
If...