After months of waiting, Westjet finally has a seat sale to Maui. Book by August 14, 2014 for dates between Sept 3, 2014 to February 12, 2015.
Promo code: WJP49
Coupon code: BGKSBWD
I just ran some dates from Vancouver to Maui in September and came up with $510CAD round trip taxes included. Wow.
For more information and to book, go to the Westjet site!