It is a vague question but here's a rough idea for a 5 * 600 mile trip based on the 2 aircraft I own shares in and routinely fly:
PA28: About GB £3,000 or £750/seat
Pioneer 300: About GB £750 or £375/seat
Both above include fuel, maintenance and engine fund but excludes airport landing/parking which could be anything from say £0 to £200/airport depending upon where you go.
Will cost more if you have to hire the aircraft.