I don't understand this comment and you're by no means the first to say it so it's not just aimed at you. It's just as easy to get there and back on a Sunday as it is on a Saturday. In fact, it's probably easier as the traffic will probably be lighter, the last train home on a Sunday is later than on a Saturday, and it kicks off at 3pm on the Sunday whereas the Saturday game would've been a teatime kick-off which means you're rushing like fuck to make that 9pm train home and if it goes to extra-time and penalties you'll probably miss it altogether.
The only issue I can see with a Sunday game is that the majority of fans will be in work on the Monday, meaning for those people it's not great for getting pissed.