According to Thrifty Traveler, the discounted flights can be found from a number of West Coast and Canadian cities. The cheapest tickets are available on flights from Los Angeles and San Diego. Seats in the low $300s are available from Victoria, Vancouver Island, and San Jose and San Francisco, California.
Cheap flights under $400 can be found from Denver, Las Vegas, Portland, Sacramento, and Seattle.
Availability is scattered between January and May, with the best deals on flights taken between January and February.
But travelers can expect even steeper price drops in the near future. On Wednesday, the Minnesota-based Sun Country Airlines announced plans to introduce seasonal flights to Honolulu.