Amanda Bynes -- High, Bizarre and Off to NYC

Amanda Bynes is off to NYC ... and she is not well.

Amanda was at LAX Thursday night at an airport restaurant, acting bizarre, painting her face with excessive amounts of makeup.

Sources connected to Amanda tell us she was visibly high all day, talking to herself and complaining about her life.

The pics below are from a Thousand Oaks, CA hair salon, where Amanda got a dye job. She was there for several hours -- again acting bizarre -- before heading to the airport.

We believe she is now in NYC.