The fastest flying insects are certain dragonflies and hawk moths, both of which have been clocked at around 35 mph. By comparison, honey bees have been clocked at only 13.9 mph at top speed, and hornets at 15.6 mph.
There is one report of a much faster insect. The male horse fly, in pursuit of a female, was clocked at an amazing 90 mph. But some people question the ability of a horse fly to fly this fast—we'll keep you posted as new information becomes available.