chances are
It seems likely. (The likely event or occurrence is stated after "are.") Chances are that my parents are throwing me a surprise party. Why else would they change the subject every time I mention my birthday? Bring an umbrella with you because chances are it's going to rain today.
chances are
the likelihood is (followed by a clause stating what is likely). Chances are that she would have been late even if she had left on time.
(the) chances ˈare (that)
(informal) it is likely (that): The chances are that he’ll come if he can finish work on time.