Denver is 1 hour behind Chicago. When it's 12:00 PM in Chicago, it's 11:00 AM in Denver. Both cities observe DST, maintaining the 1-hour difference year-round.
Chicago uses CT (Central Time) while Denver uses MT (Mountain Time).
Optimal window: 9:00 AM - 6:00 PM Chicago time (8:00 AM - 5:00 PM Denver). Business hours overlap significantly between these cities.
United Airlines operates major hubs in both Chicago O'Hare and Denver International.