How fast do neurons travel in the brain?

The speed at which nerve impulses travel in the brain varies depending primarily on the diameter of the axon and the degree to which the axon is myelinated. The larger the axon diameter and the higher degree of myelination, the faster the speed of the nerve impulse. 

The larger, myelinated axons found in neurons are capable of carrying signals at a speed of about 80 - 120 m/s, which is approximately 179 - 268 miles per hour. These neurons typically transmit information related to the sense of touch or proprioception. 

Smaller fibers with little or no myelin, carry signals at about 0.5-2.0 m/s, which is approximately 1.1- 4.5 miles per hour. These neurons carry information related to pain.