"Time Flies" is a single from British progressive rock band Porcupine Tree.

Written by bandleader Steven Wilson, "Time Flies" is the centrepiece of the 55-minute movement that comprises the first disc of the album.

The track deals with the passage of time and the phenomenon that as one gets older, time seems to pass even more quickly, with the lyrics making reference to Wilson's life so far.

[1] The single version was edited down from its album length of 11:40, running at 5:23.

The music video was directed by longtime Porcupine Tree collaborator Lasse Hoile.