The two closest stations are Arsenal and Holloway road, both probably the same distance, but holloway road station closes an hour before the game. Finsbury park is a 15/20 minute walk to the ground too, it's where most of the pubs are too if your wanting a drink. Getting out after the game is horrible though, will take you about 30 minutes just to get onto the arsenal tube, so you might be best off walking to finsbury park. Holloway road station is closed after the game. Drayton Arms is the traditional away pub, right near the arsenal station, there are many which is a mix of both sets of fans though.