The Hawaii flights are year round (HNL, OGG, KOA, LIH). I always remind people to plan well in the winter months. Flight loads are high, and strong winds from the Jet Stream during the winter can causes flights to be weight restricted... Most flights leave from YVR, however during the winter months there are direct flights from YYC, YEG, and YYJ. If you are ever planning to travel on WestJet drop me a line and I can answer any of your questions.