£300,000 (ish) for 4 F-18s, so that is £75,000 ish per aircraft.
How long was the whole sortie? If it was say 1.5 hours that is £50,000 per hour, if the sortie was longer then less.
Given that costs for Typhoon have been quoted at £70-80,000 per hour...?
Costs per hour are a highly debatable, but at the end of the day operating any fast jet is expensive, hence no doubt the drive to do more in simulators....