The aircraft, part of the Sunwing budget airline, later left with a different pilot, over 100 passengers and crew on board.
The incident was reported at 07:00 local time (14:00 GMT) on Saturday.
Reports suggest airline staff noticed the airman behaving strangely, before he passed out. They alerted the authorities and the pilot was escorted from the cockpit, later
A Police (RCMP) spokesman told a news conference they would "wait for him to sober up, before he goes before a Justice of the Peace."
The spokesman added: "It had all the potential for a disaster but I'll tell you this much - the likelihood of a pilot on a major airline like this actually being able to take off when they're impaired like that is pretty slim, because there's a lot of checks and balances.
"There's the other flight crew and there's gate crew and they're all about safety.
"So, I'm not surprised that he got caught before (the plane) left the terminal."
"He won't be flying anytime soon."
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