The airline will offer twice-daily flights from Gatwick to Toronto as well as daily services from Glasgow, Manchester and Dublin.
Gatwick will also have daily services to Montreal – which offers connections to the likes of Vancouver, Los Angeles and San Francisco – as well as weekly flights to Quebec City.
Return prices are expected to range between £436 and £497 per person.
“With excellent value fares, all including meals and in-flight entertainment, a modern fleet and wide choice of flights from London Gatwick, Manchester, Glasgow and Dublin, we’re confident that Air Transat will be the airline of choice to Canada for many passengers next summer,” said commercial director UK & Ireland Sonia Kurek on Wednesday (11 October).
