Ottawa to Chicago Time Difference
Chicago is 1 hour behind Ottawa. When it's 12:27:07 PM in Ottawa, it's 11:27:07 AM in Chicago.
How Many Hours Behind Is Chicago From Ottawa?
Chicago is 1 hour behind Ottawa. So Ottawa is 1 hour ahead of Chicago looking the other way — the same gap, described from the other end.
In practice that means a working day in Ottawa starts when it is already 8:00 AM in Chicago. That gap holds all year — no clock change in either city moves it.
Best Time to Call Ottawa and Chicago
Both cities are inside normal business hours between 10:00 AM and 5:00 PM in Ottawa — that's 9:00 AM to 4:00 PM in Chicago. That's a 7-hour window, so a call fits comfortably in either side's working day.
both at work Ottawa only Chicago only neither — hours shown along the strip are Ottawa local time.
Convert a Specific Time
Pick any date and time in Ottawa to see the exact equivalent in Chicago.
Common Times Converted
Ottawa time on the left, Chicago time on the right.
Ottawa to Chicago: Full 24-Hour Conversion Table
Based on today, Sunday, October 11, 2026 in Ottawa. Shaded rows are working hours; the darker shade marks the hours when both cities are at work.
| Ottawa | Chicago | Working hours |
|---|---|---|
| 12:00 AM | 11:00 PM prev day | — |
| 1:00 AM | 12:00 AM | — |
| 2:00 AM | 1:00 AM | — |
| 3:00 AM | 2:00 AM | — |
| 4:00 AM | 3:00 AM | — |
| 5:00 AM | 4:00 AM | — |
| 6:00 AM | 5:00 AM | — |
| 7:00 AM | 6:00 AM | — |
| 8:00 AM | 7:00 AM | — |
| 9:00 AM | 8:00 AM | Ottawa only |
| 10:00 AM | 9:00 AM | Both cities |
| 11:00 AM | 10:00 AM | Both cities |
| 12:00 PM | 11:00 AM | Both cities |
| 1:00 PM | 12:00 PM | Both cities |
| 2:00 PM | 1:00 PM | Both cities |
| 3:00 PM | 2:00 PM | Both cities |
| 4:00 PM | 3:00 PM | Both cities |
| 5:00 PM | 4:00 PM | Chicago only |
| 6:00 PM | 5:00 PM | — |
| 7:00 PM | 6:00 PM | — |
| 8:00 PM | 7:00 PM | — |
| 9:00 PM | 8:00 PM | — |
| 10:00 PM | 9:00 PM | — |
| 11:00 PM | 10:00 PM | — |
Understanding the Ottawa – Chicago Time Difference
Ottawa runs on America/Toronto, currently EDT (UTC-4:00). Chicago runs on America/Chicago, currently CDT (UTC-5:00). The gap of 1 hour is simply the distance between those two offsets.
This difference holds steady all year — no clock change in either city moves it. A meeting time that works in January works just as well in July.
Ottawa today
Chicago today
Frequently Asked Questions
What is the time difference between Ottawa and Chicago?
Chicago is currently 1 hour behind Ottawa. This difference holds all year — no clock change in either city moves it.
How many hours behind is Chicago from Ottawa?
Chicago is 1 hour behind Ottawa. Looking at it the other way, Ottawa is 1 hour ahead of Chicago.
What time is it in Chicago when it is 9:00 AM in Ottawa?
When it is 9:00 AM in Ottawa, it is 8:00 AM in Chicago.
Is Chicago ahead of or behind Ottawa?
Chicago is 1 hour behind Ottawa. Ottawa reaches each point in the day first, so Chicago is still getting started while the Ottawa working day is finishing.
What is the best time to call between Ottawa and Chicago?
Between 10:00 AM and 5:00 PM Ottawa time, which is 9:00 AM to 4:00 PM in Chicago. Both cities are inside normal business hours during that window.
Does the time difference between Ottawa and Chicago change during the year?
No. The difference between Ottawa and Chicago stays fixed all year round — no clock change in either city moves it.
What time zones are Ottawa and Chicago in?
Ottawa uses the America/Toronto time zone, currently EDT (UTC-4:00). Chicago uses America/Chicago, currently CDT (UTC-5:00).