Suman Das, 46, was arrested at Manchester Airport after the 18-year old victim claimed he touched her between her legs while she was dozing in her seat.
She said she woke up to feel a "rubbing sensation" and fled to the back of the plane in tears.
At the time of the assault at 30,000 feet, Das' wife Sonia was sat beside him unaware of her husband's behaviour, the Manchester Evening Post reported.
At Manchester magistrates court Das, from Qatar and who has been staying with friends in Bolton since his arrest, was convicted of sexual assault after a trial. He has denied the charge.
The incident occurred in July five hours into the Qatar Airways flight from Doha to Manchester.
Das and his wife were visiting the UK for a "holiday of a lifetime" while the unnamed girl was returning to Britain after travelling.
"He must have been looking at me to see if I was awake. He did move very quickly once he saw that I was awake."
The girl alerted a member of cabin crew and went crying to the back of the plane.
In a statement Das said later: "I may have touched accidentally - but I didn't touch her intentionally."
Prosecutor Holly Holden said: "In this case the victim has zero motivation to make a false claim. Her evidence has been consistent and credible throughout. This was an 18-year- old flying alone. She said that the defendant touched her between the legs over her clothing.
During the hearing Das' wife of 23 years said she had 'complete faith in her husband' and added: "I have had no concern. Until today I have faith in my husband and still today I have total faith in my husband."
Das' lawyer Miss Ellie Akhgar told the court: "This man has no previous convictions, so why would he now decide to take the plunge into criminality and sexually assault a stranger on a plane, with his wife sat next to him."
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