“It’s a Fair Way” Means “It’s Quite Far”

If you ask for directions in Australia and someone says, “It’s a fair way from here”, they mean that it is quite a long distance away—not that the route is fair. Here, fair indicates a considerable amount, so a fair way is a substantial distance.

A: Is the beach close enough to walk?
B: It’s a fair way. I’d take the bus.

You can also say, “There’s still a fair way to go”, meaning that a considerable distance remains. Do not confuse this with fairly close, which points in the opposite direction and means reasonably near. The expression is natural in both Australian and British English. When an exact distance matters, giving the number of kilometres is clearer.

https://dictionary.cambridge.org/dictionary/english/fair-way