Attorney General Lisa Madigan now has until June 24 to ask the high court to hear the case.
The 7th Circuit Court of Appeals found Illinois' prohibition on the carrying of concealed firearms unconstitutional in December. It ordered lawmakers to pass legislation to legalize concealed carry by June 9.
The 30-day extension granted by the court Friday does not affect that deadline.
A spokesman says Madigan has not yet decided if she will appeal.
In a petition seeking the extension, Madigan's office stated that the appellate court ruling conflicted with several other rulings on guns.