Yes, FLYOVERS is a Scrabble word!

Letter values in Scrabble US: F 4, L 1, Y 4, O 1, V 4, E 1, R 1, S 1.

Is it a valid word?

FLYOVERS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

bridge formed by the upper level of a crossing of two highways at different levels
a flight at a low altitude (usually of military aircraft) over spectators on the ground

Also: fly-by.