The boy, identified only as Andrei, was hospitalized with severe frostbite to his hands and feet, The Moscow Times reported Monday.
The boy stowed away in the wheel well of the Moscow bound 737 after a fight with his mother over his father's drinking, his mother said.
"The poor boy. I will never forgive myself," she told the Times.
Stowaways in wheel wells risk freezing to death after take off or being crushed when the wheels retract. This year, a body was found in the wheel well of a jet in San Francisco after a flight from Shanghai and another body was found in Atlanta after a flight from Dakar, Senegal, the Times reported.