Despite of low machinability of Inconel 718, its demand keeps increasing and many researches on the improvement of Inconel 718 machinability are being presented recently. The most serious problem on machining Nickel-based alloys is known to competitively short tool life. Many studies pointed out that the extremely high temperature near the cutting edge of a tool caused the short tool life. High pressure coolant was introduced as a good strategy for cooling the cutting tool edge, which could increase the cutting tool life. This paper presents the experimental results of milling Inconel 718 with high pressure coolant focusing on tool wear characteristics. Flank wear of used cutting tools after machining in various cutting conditions are measured and compared. General flood coolant case and high pressure coolant case are mainly compared. Uncoated insert case and PVD coated insert case are also compared and the wear maps for each cases are presented. The experimental results show that the tool wear decreases 23% in the case of high pressure coolant case with PVD coated inserts, that is, tool life increases 11% in the same cutting condition.