Start with the “Hopper” app. For reference only this is a great app. There are no great differences between airlines. It all about loads and timing. Some have offers like WestJet Credit card 250$ credit with free bags. Do the math. Direct flights from secondary cities are a bonus. Air Canada has the resources to accommodate changes (aircraft, weather etc. and best frequent flyer rewards) vs. ie: Sunwing. Can you easily get to Hamilton to save 100$ on swoop? Great! Get alerts from TripAdvisor and other Travel sites for low fare sales. Will you add travel time and hassle to connect thru USA to save a few bucks? Book early and relax and daydream! Besides death and divorce, buying airline tickets to Mobay can be the most stressful event in your life!