I know of three options here. Taxi costing $465.00 for up to six people, Mountain Perks shuttle from Calgary Airport to Fernie at $59.00 per person last I used, and Rocky Mountain Shuttles where I don’t know the price. All three have websites that can be found with a google search.
Note on the Shuttles, be on time for the departure because they won’t make the other passengers wait for you.
