Discrepancies occur from nearby financial problems, overseas exchange charges or the fact that an airline will endeavor to poach passengers from exterior its residence nation by giving cut-price fares. You may thus use airfare geo-arbitrage towards your gain. I extremely recommend receiving the Elite version of Scott’s Cheap Flights (now https://businessflightshop.co.uk/blog/board-a-flight-to-canada-from-uk-know-the-finest-accommodation-in-bromont/