There have been some nice deals to Hawaii from the West Coast of North America in both business class (~$700 from YVR) and economy class (below $300 from CA). However I just wanted to mention that the deals aren’t just limited to the west coast. There are some ~$450 RT fares from Toronto – Honolulu all year round in United Economy, and ~$1050 roundtrip deals in United business. The best part is that the deal is available through the end of this year with a few price fluctuations of +/- $50.
These are some decent deals on otherwise expensive routes from the East Coast. It’s fairly easy to get to Toronto from New York, Philadelphia, and Charlotte given that BA charges 7500 Avios on that route with American.
Something to keep in mind is that Delta still has a nice AMEX Offer for $120 off $600 in spend, which may turn the tables in favor of Delta over United when looking for these deals: