Light travels at the same speed in a vacuum, regardless of its frequency (and therefore, whether it's in the ultraviolet, infrared, or any other part of the electromagnetic spectrum). This speed is approximately:

* 299,792,458 meters per second (m/s)

This is often rounded to:

* 3 x 10^8 m/s

It's important to note that this is the speed of light in a vacuum. The speed of light can change when it passes through different mediums like air, water, or glass.