You can still reap the benefits of price wars on flights to Hawaii. If you're up for an island vacation in the very near future, you're in luck.
There's no single sale taking place right now, but prices on flights in April and May through airlines like Delta, United, Alaska, and Hawaiian are really good right now. The cheapest among them will get you from Denver to Kahului (OGG) for as little as $317 roundtrip. And that's not on some budget airline where you'll get stuck with a knapsack full of fees. That flight is through Delta.
Among the deals are flights out of Seattle ($343 to OGG or Honolulu/HNL), Portland ($343 to HNL), San Diego ($348 to OGG), San Jose ($359 to OGG), San Francisco ($378 to OGG), Los Angeles ($413 to HNL), and Phoenix ($479 to HNL). Though, to get the best prices you should probably book soon. Ticket prices can change quickly.