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The man was later identified as a 21-year-old student at Vinh University. He has taken a leave of absence from the university for the treatment of his mental illness. His family has submitted the required health checks and papers to prove that he was being treated at a local hospital and get him released.
According to the authorities, he climbed the wall into the airport and walked through several security checkpoints before boarding the plane.
The Civil Aviation Administration of Vietnam is investigating the case and reviewing airport security.
Tran Hoai Phuong, director of Northern Airport Authority said four security guards were fined VND10m (USD439) each and had their licenses withdrawn for two months. A member of ground staff was fined VND4.5m and Vinh International Airport was fined VND40m.