All about the dates!

This will clearly illustrate how you can save 50% (or 90%) on the same vacation, just by choosing the "right"  dates.

On average, you can hope to save 40-50% by travelling in low season, or immediately following a national holiday, rather than on the holiday.

Screenshots were taken within 3 minutes of each other. Apples to apples comparison.

Westjet Vacations.