If you get emails from WestJet you likely received one about a one-day sale today. It’s 15% Econo, 15% off Flex and 25% off Plus base fares. Use the Coupon Code 8K7Q8A5 in the search page. On any such sale, there are typically blackout dates and other restrictions. For this promo the blackout dates include Sept. 1-2, 5-6, Oct. 6-7, 10-11 and Nov. 10-15. Travel must occur between August 23- December 14. Here are a few examples I found where the discount was applied.
Halifax – London Sept. 28-Oct. 12 $511.85 (savings of $52)
Halifax – Boston Sept. 23-27 $299.29 (savings of $29.71)
Halifax – Winnipeg Sept. 22-29 $455.29 (savings of $50.10)
If you have a flight to book today it’s worth checking to see if this coupon code will save you any money. It’s supposed to apply to all destinations WestJet serves but I found it to be hit or miss in my brief bit of searching.