All electromagnetic (EM) waves travel at the same speed in a vacuum, which is approximately 299,792,458 meters per second (m/s). This is often rounded to 3 x 10^8 m/s, which is also known as the speed of light (c).

While this is the speed in a vacuum, the speed of EM waves can be slightly slower in other mediums like air or water due to interactions with the medium's particles.