Depends on the medium.
"Velocity of light in a vacuum" is the constant speed, according to Relativity, and its value appears to be
299 792 458 m/s
(the metre was redefined to ensure that this speed value is an integer = no fractions)
= approx. 186,282 US miles per second.
For approximations, we often use 300,000 km/s.
Speed of actual photons (the "packet of light" that carries the energy) will be very often less than that if the light is going through a medium (for example, water) and, under very rare circumstances, can be slightly higher (but the information itself cannot exceed the speed of light in a vacuum).
One example (that has been known since the 1940s) is that of the radar guide tube where the photons, having to travel a longer distance (by bouncing back and forth between the walls of the guide tube), must travel "faster than light" in order for the information to travel through the tube at the speed of light.
Einstein, still alive at the time, did not see a problem with that since, in Relativity, it is the information that counts, not the photon itself.