Philadelphia is 1 hour ahead of Chicago. Philadelphia uses Eastern Time (ET) while Chicago uses Central Time (CT). When it's 12:00 PM in Philadelphia, it's 11:00 AM in Chicago.
Both cities observe daylight saving time on the same schedule, so this 1-hour difference remains constant year-round.
Best calling time: 9:00 AM - 5:00 PM Philadelphia time. This corresponds to 8:00 AM - 4:00 PM in Chicago, covering full Central business hours.
Philadelphia and Chicago are two of America's largest cities. Both have major financial sectors, healthcare systems, and universities. Direct flights take about 2 hours.