From The Runaways Movie official Facebook page, The Runaways will open in 10 US cities and 3 Canadian cities on March 19th, and the rest of North America on April 9th:
THE RUNAWAYS OFFICIAL RELEASE DATES
Today at 4:01pm
The Runaways will open on March 19th in:
The movie will open in theaters everywhere across North America April 9th.
Other international cities to be announced shortly.