The standard collective nouns for flies are:
A group of crows is called a murder.
i dont know, what is flies on a string called?
....
there's a whole bunch of those. which one?
Lykke Li, Puddle of Mudd, and Porcupine Tree sing songs called Time Flies.
bunch
WHAT IS A GROUP OF ATHLETES CALLED
A bunch of penguins are called a flock of penguins.
A group of grapes is called a bunch of grapes.
a stem of orchids is called a spray but multiple sprays would be called a bunch
A bunch of tigers Is called an Ambush or Streak.
An Album.
Quiver
Smorgasbord?
Shoal
Astronomer
A collection