Upgrade bid from YYZ to ICN
Hi - I have a flight booked in premium economy from YYZ to ICN. I'm wondering if I should bid for an upgrade. The minimum bid is at $800 each way. It looks like there are about 8 available seats in the business class as of now. It would be my first time bidding so wanted to ask if there is a better time to bid (i.e. closer to the flight?) and is there a math/logic that people use when deciding how much to bid? Thank you.