The latest WestJet sale includes fares to Hawaii to compete with the prices I reported last week. This one is a 2-day sale (through Jan 8), for travel through March 5.
Kona, HI (KOA) $358 RT
Honolulu, HI (HNL) $358 RT
Kahului-Maui, HI (OGG) $438 RT
The Maui prices isn't all that great, but you could save over $100 by leaving from Seattle:
Seattle, WA (SEA) to Kahului-Maui, HI (OGG) $350 RT