The Best Points and Miles for Free Flights to Hawaii 
If you’re using miles from your United, Delta or American Airlines account to book flights to Hawaii you’re likely paying almost 50% more than you could if you used a different travel rewards currency. There are great alternatives with transferrable points that can get you access to the same seats at much better prices.
United MileagePlus Flash Sale to Hawaii – March 14, 2018
United has launched a one-day flash sale, offering 20% off economy class saver MileagePlus awards to Hawaii. You’ll need to book by March 14, 2018, 11:59 pm CDT to take advantage of the discount. We haven’t found a page on United’s site describing the sale, so you’ll need to go to United.com and search to see if you receive a discount
United 20% Off Saver Awards To Hawaii – Book By December 8, 2017
United has announced an award sale where you will receive a 20% discount on miles needed to fly economy class to Hawaii when booking by December 8, 2017. Instead of 45,000 miles for a round-trip economy saver award, you will pay 36,000 miles. While on the surface this sounds like a deal, it is highly dependent on where you currently have your points and miles.
Delta SkyMiles Flash Sale to Hawaii and Alaska – September 2017
Delta has launched an award flash sale, this time around it is for flights to and from Alaska and Hawaii. The sale starts at 20,000 miles roundtrip to Alaska, and 35,000 miles roundtrip to Hawaii. But you will have to hurry since the sale ends on September 14, 2017.