Katsutoshi Jitsukawa, 42, an employee of Japan Airlines, was scheduled to fly from Heathrow to Tokyo on October 28 at 18:50. Local time, but failed a breath test just before the start.
The test revealed that Jitsukawa had 189 mg of alcohol per 100 ml of blood in his body. The legal limit for pilots is 20 mg, while in England, Wales and Northern Ireland motorists up to 80 mg are allowed.
The alarm was triggered after a driver of a crew bus smelled alcohol and called the police who carried out the test according to the Japanese station NHK.
Jitsukawa said he had drunk two bottles of wine and a mug of beer the night before the flight, NHK reported.
He was remanded and later pleaded guilty to aviation when his abilities were compromised by alcohol. Jitsukawa had planned to fly a Boeing 777 with 244 seats.
When he responded to the conviction, Aviation Police Inspector Iain Goble condemned the "serious" offense that could have had "catastrophic" consequences.
"This belief shows that he disregards not only the safety of all passengers and employees on his flight, but also the general public," said Goble.
Following the arrest of Jitsukawa, Japan Airlines apologized for the incident, saying "Safety remains our top priority," adding, "Immediate action is taken to prevent future events."