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Mount has one year left on his contract at Stamford Bridge, and United initially had three bids rejected by their Premier League rivals.
In a farewell social media video to Chelsea supporters on Tuesday evening, Mount said: "Hi Chelsea fans. Given the speculation over the last couple of months, this may not come as a surprise to you that I've made the decision to leave Chelsea. I feel you deserve more than just a written statement.
"So I wanted to tell you directly how grateful I've been for all of your support over the last 18 years. I know some of you won't be happy with my decision, but it's what is right for me at this moment in my career.
"I joined Chelsea when I was six years old and we've been through a lot together. Winning the Youth Cup, my player of the year awards, the Super Cup, the Club World Cup, and the unforgettable night where we won the Champions League.
"I want to say thank you to the academy for being so influential to me from a young age. The managers I've worked under, the backroom staff, all of my team-mates over the years who have become my brothers, and most importantly you guys.