How fast can a fly fly

He's in the car, so he's already traveling at 70mph relative to the ground. Assuming the windows are closed so he's not getting a breeze from the slipstream pushing past the car outside and pushing him (or her) backward, he'll just fly at his normal speed, I'd guess a couple miles an hour, forward--a couple miles an hour relative to the car, 72 or 73 miles an hour relative to the ground.

not mjuch online, but it's suggested houseflies fly around 5mph with bursts up to 15mph if they feel threatened, dragonflies fly around 18 to 36 mph.

Hi MontereyJack
You must be right, but it seems strange to me that if I'm driving at 70mph a fly doesn't have to better that speed to move around. I've never tried this,but if I was at the front row of seats on a plane and jumped up, my way of thinking is that the back end of the plane would crash into me before I landed, I know this isn't so and I guess that I'd land on the same spot that I jumped from. This seems a strange law to grasp. especially after a few glasses of my homebrew wine.
Anyway, thanks for replying Jack.

How fast can a fly fly? Probably as fast as a woodchuck can chuck wood.