That number will definitely vary on the specific plane you fly. Maintenance costs are extremely large in owning an aircraft as well. A lot of companies will give better rates if you purchase more hours. For instance, you can buy a small block of hours and pay a bit more per hour, where as, if you purchased a larger block of hours, you would save yourself a good deal of money.Anywhere from $2,000/hr in a Citation V (or equivalent) to $10,000+ per hour on a Gulfstream.
Those are charter/lease rates. Actual "cost" if you were to own the plane is significantly less than that per hour, but then you have a couple pilots, hangar, insurance, etc. to deal with.
For example, our Citation Bravo is actually closer to $1,200 per hour in Direct Operating Costs (fuel, engine programs, etc.). I've read that owning vs chartering starts to make sense around the 200/hr per year mark, although I've never done the math.