Originally Posted by
vancouver25k
I've seen the same with cash fares ex-US. SFO-YVR is cheaper as two one ways than one round trip. YVR-SFO round trip prices out the same as two bookings. I always assumed something to do with taxes/fees but never actually looked into it.
From what I was told one-way cash fares to the US will always be slightly cheaper because a one-way originating in the US are GST exempt but a return is always subject to GST.