The price per hour for an airborne Typhoon has just been estimated at approx £70,000 / Hr. Tornado / £35,000 Hr and the Harrier slightly above that. The reason cited as to why the Typhoon is so costly is because there are so few of them at the moment. As more builds arrive at their units, the price will obviously fall, by how much I have no idea.
70K-----Ouch!