Regent honeyeaters are now classed as endangered, the total population estimated at between 500-1500 birds. There are historical records from the early 20th century of large irruptions of thousands of birds in some areas, generally coinciding with large scale flowering events. These days, Regent Honeyeaters appear to be partly nomadic and in some areas perhaps migratory, returning to breed in favoured areas year after year. These are usually places where certain eucalypts such as Yellow Box, Ironbark or White Box are flowering in sufficient numbers. In coastal regions during winter they are often found in areas where Swamp Mahogany is in flower.

Whilst nectar from flowering eucalypts is an important part of their diet, like other wattlebirds, Regent Honeyeaters also consume insects by both sallying to catch them in flight and also gleaning in foliage.