Orca Airways and Tofino Air have flights from Vancouver.
Kenmore Air has charter flights from Seattle.
Also, Air Canada has several daily flights from Vancouver to Nanaimo, from where you can drive.
Tofino is a roughly 3 hour drive from Nanaimo along Highway 4 (a.k.a. the Pacific Rim Highway). The route is very picturesque, passing through Cathedral Grove, Port Alberni, Sproat Lake Provincial Park, Taylor Arm Provincial Park, Clayoquot Plateau Provincial Park and Kennedy Lake Provincial Park. There are several switchbacks along the way and it's generally advised to make the journey during daylight hours.
From Nanaimo:
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