as far —(also: this far) to a specified point or place:
- They opened more clinics since people couldn’t travel as far for medical care.
so far—
1. until now; up to the present time:
- There has not so far been any book-length study focused on postmodernism.
2. = as far:
- It really makes you think about how amazing it is that you can travel so far in one day.