Image credit: Sharp Real Estate
Looks like there is a pretty good fare from Calgary to Vancouver and vice versa with Air Canada with travel dates into June. $229 CAD tax in, round trip, nonstop flights! This is down from the ~$450 or so that the fare normally is. The perfect opportunity to visit the coast in prime time to enjoy flowers abloom and mild weather.
Go to Kayak, and search flexible dates (+/- 3 days). Here is an example of dates that work: