Air Canada has sale on flights to London, Heathrow from cities across Canada. Travelers should book by Sept 8, 2015 11:59 pm EDT to enjoy low fares. The low fares are valid on travels from October 26, 2015 to December 16, 2015 and from December 28, 2015 to March 23, 2016.
For more details about the promotion, click here.