General:
* Escaped
* Ran away
* Took flight
* Absconded
* Skipped
* Made a break for it
* Disappeared
More formal:
* Evacuated
* Departed hastily
* Withdrew
* Retreated
More descriptive:
* Bolted
* Dashed
* Sped
* Hurried
* Scampered
* Scooted
* Streaked
The best synonym for "fled" will depend on the specific situation and the tone you want to convey.