They flew Maui last week or the week before. I don't remember exactly. Maui and the Big Island get a week each, every month from around April through November, though I think I remember them flying the Big Island for longer than a week at least once. I know they fly Oahu at least once a month for at least a week and I don't know where they go for the other week, maybe Kauai. I know it's rare to never for them to fly Molokai and Lanai. So yeah, you should expect them at least once a month. And they don't fly the islands in the same order every month, so you might have a 7 week span in between visits or a 2 week span.
They don't fly during the middle of the winter from November-ish to April-ish so that's when some people take the opportunity to put a lot of plants outside.