In this paper, we are investigating the effect of route length in routing and spectrum assignment problem in an elastic optical network. The probability of connection acceptance also depends on the route length of connection requests. Connection request only accepted when requested bandwidth available on the entire route of the request. Here, we have evaluated the effect of route length on three different network parameters: bandwidth blocking probability (BBP), network capacity utilized, and average network capacity utilization (ANCU). Simulation results show that BBP drastically increases as the length of the route increases. And, network capacity utilization for longer connections is less due to spectrum unavailability. On the other hand, ANCU for longer routes is very high.