The current operating cost for flying a B-17 is $4000 an hour. It costs a customer $425 for a half hour's flying experience. Here's a link to the Collings Foundation. The Collings Foundation - Stow, MA JT
I flew on the B17 in 1994. One hour was for $400. It was a great experience though! The thrill of sitting in the nose looking through the bomb site was something I will never forget.