The big question is - what type of operation? Does the person running the route own the aircraft or are they leasing (whether it be charter, ACMI or similar). Also depends on the route.
An operation from MAN to LHR will cost less than LHR to CTA - much more detail needed. What pax configuration? Business/executive or general commercial?
Far too many aspects to consider. You could be looking at £15,000 - £65,000 for a one way flight using these. Certain routes carry higher fees and taxes too. Too many questions to give any kind of reasonable answer