flee (to leave a place very quickly, especially because of danger or fear): We managed to flee to safety.
run away (to escape from a place, person, or situation): He ran away from home when he was sixteen.
run off (to escape from a place, person, or situation): He ran off with all the money in the safe.
make off informal (to leave quickly in order to escape): When the rabbit saw us, it made off at once.
take off (leave in a hurry): George just took off without saying goodbye.
run for it informal (to escape by running away): Here come the cops! Run for it!
take flight (to run away): The gang took flight in an unknown direction.
take to your heels (to run away): When the burglars heard the police arrive, they took to their heels.