I booked a round flight tickets (around $800) and 2 months before my trip, I wanted to change the return date. The change penalty is $175 but they wanted to charge me $1000+ dollar in total including $175 + price difference. However, if I just book new round way tickets, it's only $700+.(I should got negative price difference indeed). How ridiculous it is! That reschedule is much more expensive than book new flights. My friend called and out of a sudden they reduced the charge from $1000+ to $500+ and then to $400+. This company IS cheap but extremely unreliable. It seems to me that they just randomly charge an amount. Official airline (e.g. Westjet) only charges $200 for cancellation and put the rest into store credit even on cheapest non-refundable tickets. We spent extra $400+ just for changing a return date. NOT recommend this website.