Vienna is 7 hours ahead of Chicago. When it's 9:00 AM in Chicago, it's 4:00 PM in Vienna. Both cities observe DST, maintaining the 7-hour difference year-round.
Chicago uses CT (Central Time) while Vienna uses CET/CEST.
Optimal window: 7:00 AM - 11:00 AM Chicago time (2:00 PM - 6:00 PM Vienna). Early morning calls from Chicago reach afternoon business hours in Vienna.
Vienna is a major cultural and business hub in Central Europe with connections to Chicago's music scene.