Chicago to Boulder Time Difference
Boulder is 1 hour behind Chicago. When it is noon in Chicago, it is 11:00 in Boulder.
Chicago (UTC-5) → Denver (UTC-6)
🕐 Interactive Time Explorer
When it's 00:00 in Chicago, it's 23:00 in Boulder
Drag the slider to see corresponding times in both cities
🤝 Best Meeting Times
Chicago & Boulder✓ Perfect Match (7 hours)
◐ Extended Hours (2 hours)
✈️ Travel Information
Distance
1,493 km
Est. Flight Time
~2.8h
Time Difference
-1h
Work Hours Overlap
7h
Excellent
🔴 Office Closed
Tomorrow 10:00
10:00 - 17:00
⏰ Quick Conversion
06:00
Chicago
05:00
Boulder
09:00
Chicago
08:00
Boulder
12:00
Chicago
11:00
Boulder
15:00
Chicago
14:00
Boulder
18:00
Chicago
17:00
Boulder
21:00
Chicago
20:00
Boulder
00:00
Chicago
23:00
Boulder (-1)
03:00
Chicago
02:00
Boulder
Frequently Asked Questions
How many hours is Chicago ahead of Boulder?
Boulder is 1 hour behind Chicago. When it is 12:00 noon in Chicago, it is 11:00 in Boulder. Chicago operates on America/Chicago (UTC-5), while Boulder uses America/Denver (UTC-6).
What is the best time to call Boulder from Chicago?
There are 8 hours of overlapping business time (9 AM–5 PM) between Chicago and Boulder. The best window is 10:00–18:00 Chicago time (09:00–17:00 in Boulder).
Does the Chicago to Boulder time difference change throughout the year?
The time difference can shift by up to one hour when either city observes Daylight Saving Time (DST). DST transition dates differ between countries — typically March/April in the Northern Hemisphere and October in the Southern Hemisphere. Always verify the live difference above when scheduling important meetings near DST changeover dates.
Flying between Chicago and Boulder
The distance between Chicago and Boulder is approximately 1,493 km. A direct flight typically takes around 2.8 hours. Your arrival clock will show local Boulder time — use our Flight Time Calculator to predict exact arrival times.