Yes, radio waves are a type of electromagnetic wave, and like all electromagnetic waves, they travel at the speed of light in a vacuum, which is approximately 299,792,458 meters per second (or about 186,282 miles per second). This fundamental speed limit is a fundamental constant in physics and denoted by the symbol "c." Whether it's visible light, radio waves, microwaves, X-rays, or gamma rays, all forms of electromagnetic radiation travel at this speed in a vacuum.