Which one is correct ?
AT the end of the journey / film / book / street / runway etc. When you say 'at' you are thinking of a point in time, or a specific place.
IN the end we decided to stay at home. IN the end the jury found him not guilty IN the end the staff managed to get a pay rise
If you use 'in' you are thinking of the end of a process, or an argument or a negotiation, rather than a point in time or a particular place