General aviation: 11.2 fatal accidents and 19.7 fatalities per million hours
Commercial aviation: 0.2 fatal accidents and 6.5 fatalities per million hours
Driving: .528 fatal accidents and .588 fatalities per million hours [1]
That's per hour. Accident rates per mile look much better for aviation, because planes are faster. Commercial aviation has more fatalities per accident because the planes are bigger. Note the 50x difference between fatal incidents in GA and commercial aviation.
" GA flying covers small training aircraft capable of cruising at 100mph, and business jets capable of cruising at several hundred miles per hour, so choosing an average cruise speed is difficult, but for the sake of argument, we'll choose 150mph. This gives us a comparison of:
GA: 7.46 fatal accidents and 13.1 fatalities per 100M miles
driving: 1.32 fatal accidents and 1.47 fatalities per 100M miles
So when compared on a mile to mile basis, flying has 5.6 times as many fatal accidents, and 8.9 times as many fatalities (these number would be even worse for flying if we took out motorcyle and pedestrian fatalities). "
Still quite a bit more dangerous per mile than for driving. (More than I would expect actually.)
[1] http://www.meretrix.com/~harry/flying/notes/safetyvsdriving....