It also depends on what movie and what format. The Regular movies at early bird can run from between 11 and 13 dollars. The RPX which is a bit nicer will start about 13 or 14, and IMAX is around 20 per adult seat. Best way to know though ia to look on regmovies.com or download their app. Choose the movie and time, and it will show you the ticket cost. If you do purchase online though, there is a $1.50 convience fee you dont pay when purchasing at the box office.
It really depends on where regular sitting vs. picking your seats.
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