Hi All - bit of a noob here. Hope you can help me.

I have to fly from Toronto to Vancouver from work. My work will cover the price of an economy ticket. I'd like to travel in business, but it's quite expensive. I plan to buy an economy ticket, to be reimbursed from work, and then hope that the flight isn't full, and upgrade 24 hours before takeoff, as I hear that's significantly cheaper.

I am wondering though - does anyone know: is it the same price to upgrade to business, regardless or what type of economy ticket one holds? (Tango, Flex, Latitude). Is there any point in me buying a Latitude ticket, for example, as opposed to a Flex? (I know there are certain other benefits, just wondering about upgrades).

Thanks everyone!