Pursue News is reporting that the Bill & Ted 3 shoot will begin on March 5, 2019. Filming will take place in Los Angeles, Tempe and Phoenix but is not known at this time which location is up first. Their source for the information is Production Weekly.
Note: As seen with previous shoots, often the start date is delayed by a week or so. That being said, Production Weekly’s information is reliable.
Update: Pursue News has updated their article to say that the studio contacted them and said they were not filming in March in AZ.
Production Weekly isn’t able to command the high subscription prices they charge by publishing incorrect information. In the past their information has been correct. The choices here are #1 the info is incorrect #2 the info is correct and the studio is trying to draw attention away from it. Time will tell which one it is.