Following this week’s launch of NewLeaf, Westjet has responded with record breaking deals for a number of the same service routes offered by their new competition, along with a few more.
Great deals can be found to/from a number of western airports, southern Ontario, and Halifax. Specific airports include:
Toronto
Hamilton
Winnipeg
Abbotsford
Vancouver
Kelowna
Regina
Saskatoon
Halifax

Reasonable date options appear to be available now through April, check Google Flight Explorer (pricing shown in USD) and Expedia.