It's the peak travel season for Hawaii. You shouldn't expect to find the best prices at a time like this. However, there are some damn good prices on flights to Hawaii from cities across the country right now.
There isn't a single sale taking place. Instead, you'll find good prices across a handful of airlines like United and Hawaiian, among others. Those alluring fares includes round-trip flights to Hawaii for $272. The airlines will vary from city to city, but the majority of flights are for travel between January and April, 2020. However, you'll want to check the fees and details for each airline, as some can make the price increase dramatically with bag and seat fees. Though, it's worth noting that none of the airlines here are budget airlines like Spirit or Frontier.
Here's a sampling of some of the best prices available, as found through Google Flights. Though, it's by no means a completely exhaustive look at the better-than-average prices available right now.