The airline will operate flights between the two cities four times a week, with a Boeing 737 Max aircraft being used on the route.
Shannon has received a major boost with the announcement of two new services, including new direct flights to Toronto in Canada.
From Montreal, flight AC818 heads out at 9:15 p.m., arriving in Dublin at 8:25 a.m.
Air Canada now operates 14 flights a week from Dublin to Vancouver and Toronto.
The carrier said on Wednesday that it will begin flying from Dublin to Montreal and Shannon to Toronto from June, 2018.
Air Canada are transferring the existing Dublin to Toronto service from Air Canada Rouge to their mainline services from the end of October.
"It will offer customers amenities such as fully lie flat suites in International Business Class, a Premium Economy cabin and seatback in-flight entertainment".
Outlining the potential for the service, which will operate on Mondays, Wednesdays, Fridays and Saturdays, Andrew Murphy, managing director of Shannon Airport said: "Canadian tourists are high spenders and businesses along the Wild Atlantic Way in particular will benefit as the route will deliver significant Canadian visitors directly to their doorstep. We are delighted that Ireland will be one of the first routes to experience our new aircraft", said Benjamin Smith, President Passenger Airlines at Air Canada. "As an island destination, the importance of convenient, direct, nonstop flights can not be overstated - they are absolutely critical to achieving growth in inbound tourism".