Cheapest ticket option is the super off peak day return,price £15-00 from Kings Cross this ticket can be used only on the following trains.
Dep 15-35 Arrive 17-06
or earlier trains at 35 mins past the hour.
Return trains
21-46 Arrive 23-02
22-27 Arrive 23-55
22-44 Arrive 23-59
Also there may be strike action on London underground on the day.
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Comments
The game KO's at 7.30, so could finish at 9.25.
But if it goes to extra time & pens, it could finish at 10.20 or even slightly later.
You would then have to dash back to the station (1 mile), to catch the last train at 22.44.
If you manage that, you've then got to get from Kings X at midnight, to London Victoria in my case, to catch the last train at 00.37. As there may well be a tube strike, you will be relying on buses or taxis.
It's not worth the stress for me.