The Calgary-based airline introduced flights from St. John's, N.L., to Dublin earlier this year.
WestJet said it expects the daily seasonal service between Halifax and Glasgow will attract Nova Scotians wanting to visit family and friends, Canadian tourists looking for a Scottish experience, and Britons travelling to Canada.
It also promised travellers a cheaper way to get to Scotland.
"Fares to Glasgow will be as much as 50 per cent off existing prices," said Bob Cummings, WestJet's executive vice-president, sales, marketing and guest experience.
The five-hour, 15-minute non-stop flights from Halifax — with same-aircraft service from Toronto — begin May 29 and continue until Oct. 23.
Introductory one-way fares, including taxes, will start at $259 from Halifax, and $285 from Toronto, the airline said in a news release.