Yes, it's usually not cheap to fly in Canada --
But we now finally have a RyanAir-like airline called Swoop in Canada. I was able to see some $69 fare sales to fly between Toronto and Vancouver. Or those $29 Vancouver-Edmonton airfares (that pair was sometimes $19 last year). I think I saw a fare sale last year on Halifax for as low as $59 Browse 2 months out and you'll see crazy cheap stuff. And Toronto now has Flair, not as cheap as Swoop, but the $59 Toronto-Ottawa fares beginning this summer 2020 start to fall into RyanAir league territory.
(Granted, Toronto-Vancouver is actually Hamilton-Abbotsford but RyanAir plays the same game of flying into minor airports near big cities)
Flew 5 times with Swoop and... it's kind of a Canadian equivalent of RyanAir.
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Just like RyanAir, must pack light -- even clothes in your laptop bag to get out of a ~$50 carry-on fee!
That said, have a Plan B if your flight is cancelled. They'll essentially abandon you at the airport and you may have to wait days for your return. They're currently constrained by the lack of Westjet 737 hand-me-downs due to the Westjet 737 Max groundings, so Swoop currently doesn't have a spare backup airplane. RyanAir is known to do the passenger-abandoning game, mind you -- but at least you've got lots of European rail options as backups. Here in Canada, not so much, and we're also a bigger country, so we only can compare to RyanAir's longer-haul routes which are actually similar priced for similar distances.
Caveat emptor with both RyanAir and Swoop (and Flair), but the prices have been tempting if you travel light.
I rather take the VIA train if it's within a day trip mind you -- lots more baggage allowance.