I looked at BUF-YEG with AA but the price for the day I want to travel is $A1019.60. Also, I plan to rent a car at YYZ and it will be cheaper to return it there.

Over the past few days I've been looking at the AC website each day and the fare for YYZ-YEG has been $353.80 Australian Dollars including taxes each day but I've just looked and the lowest price for July 23 is now $A454.60 including taxes - a rise of $100! From past experience, is it likely that prices will fluctuate up and down or once prices increase (three and a half months out) are they more likely to stay at the higher level? I see that AC had a one day sale for flights until the end of June. Do they have these types of sales very often? We've been having a lot of sales with our airlines here in Australia.

I've also looked at the Westjet website and their price for the same day is $343 CAD, which is approx $A386. While the AC fare was $A353 that seemed the better option but now I'm thinking that maybe I should book the Westjet fare.