As of a few seconds ago, this is the best route Google Maps can find to go from Vancouver to Kelowna: https://archive.md/we9X5 You have to go pretty far into the US on this route. Edit: Incidentally, asking for directions from Vancouver to Edmonton currently causes Google Maps to fail and give you a route that's closed: https://archive.md/7lLu4
Or just fly. Airports are fine.