I was planning to book my Nov trip from SJC-OGG this weekend. I checked the Hopper app and it suggests I could save almost $400 by waiting to book my preferred itinerary on Hawaiian.

It would be great to save $400. But how accurate are Hopper's future fare estimates? Is it worth waiting to see if the fares actually go down? Is there a decent price drop guarantee booking service I should book through instead of directly through the airline? I know Alaska still has its price drop guarantee good for fares booked in August. But they're already quite a bit more expensive than Hawaiian for basically the same trip.

Thanks for any advice!