The easiest way to get to Tofino and Ucluelet by air is to land on Vancouver Island as that will save you time and dollars not having to use the ferry service from Vancouver.  Vancouver Island airports most used are Victoria Airport and Comox Airport, from there you can rent a car and drive the remaining way to the west coast.  Other smaller airports used are Nanaimo Airport and Long Beach Airport which is here on the Pacific Rim.  Large airliners do not currently land at Long Beach Aiport how ever there are smaller commercial flights that use this airport.  If you land at Comox airport your drive from there to Tofino or Ucluelet will approximately be 2.5hrs.  If you land in Victoria Airport the drive time is approximately 4hrs to the Pacific Rim.

There are also bus services to get to to either Tofino and or Ucluelet via Tofino Bus.  View schedules and fares -- >  https://viconnector.com