While this won’t be useful to everyone, this is an insanely good deal that I can’t not share. Per this FlyerTalk thread, Ethiopian has published some crazy low business class fares from Bangkok to Toronto. You can fly roundtrip refundable business class for $770 (select “Cloud 9 Deluxe” rather than “Cloud 9 Restricted,” since it’s only marginally more but gives you a lot more flexibility).
This is bookable directly on Ethiopian’s website, which is the best place to search, since not all availability shows up on Google Flights.
The total roundtrip fare is 26470THB.