Saudi woman, Rahaf Alqunun boarded a Korean Air flight from the Thai capital to Seoul late on Friday night before flying to Toronto.
The Australian government has welcomed the news, saying Rahaf Mohammed Alqunun's safety was its primary concern.
Ms Alqunun had been initially denied entry to Bangkok but after a tense 48-hour airport stand-off - some of it barricaded in a transit lounge hotel room - she was allowed to enter the country.
There, her case was processed by the United Nations Refugee Agency.
The teenager has accused her family of abuse, and has refused to meet her father and brother who reportedly arrived in Bangkok to try take her back to Saudi Arabia.
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