Originally Posted by
craigthemif
This is correct.
Many Canadians drive across the border to BLI or down to SEA precisely to avoid these taxes and to access cheaper US domestic fares.
I'd just take the coach in this scenario anyway. £10, 4 hours centre to centre - not a huge amount more time consuming than the flight (given security, waiting time and airport travel) and reasonably comfortable (Greyhound is better than it used to be and Boltbus is pretty good).