If you need extreme data points you should look into the Russian Premier League for Football. While sports in the USA use Eastern/Western Conferences to lower travel requirements, the Football leagues enforces 2 matches per teams regardless of location. In the 2017-2018 season the farthest two teams were 5,000+ miles apart! [1]
[1]https://en.wikipedia.org/wiki/2017%E2%80%9318_Russian_Premie...