Chicago to Ottawa Time Difference
Ottawa is 1 hour ahead of Chicago. When it's 11:27:04 AM in Chicago, it's 12:27:04 PM in Ottawa.
How Many Hours Ahead Is Ottawa From Chicago?
Ottawa is 1 hour ahead of Chicago. So Chicago is 1 hour behind Ottawa looking the other way — the same gap, described from the other end.
In practice that means a working day in Chicago starts when it is already 10:00 AM in Ottawa. That gap holds all year — no clock change in either city moves it.
Best Time to Call Chicago and Ottawa
Both cities are inside normal business hours between 9:00 AM and 4:00 PM in Chicago — that's 10:00 AM to 5:00 PM in Ottawa. That's a 7-hour window, so a call fits comfortably in either side's working day.
both at work Chicago only Ottawa only neither — hours shown along the strip are Chicago local time.
Convert a Specific Time
Pick any date and time in Chicago to see the exact equivalent in Ottawa.
Common Times Converted
Chicago time on the left, Ottawa time on the right.
Chicago to Ottawa: Full 24-Hour Conversion Table
Based on today, Sunday, October 11, 2026 in Chicago. Shaded rows are working hours; the darker shade marks the hours when both cities are at work.
| Chicago | Ottawa | Working hours |
|---|---|---|
| 12:00 AM | 1:00 AM | — |
| 1:00 AM | 2:00 AM | — |
| 2:00 AM | 3:00 AM | — |
| 3:00 AM | 4:00 AM | — |
| 4:00 AM | 5:00 AM | — |
| 5:00 AM | 6:00 AM | — |
| 6:00 AM | 7:00 AM | — |
| 7:00 AM | 8:00 AM | — |
| 8:00 AM | 9:00 AM | Ottawa only |
| 9:00 AM | 10:00 AM | Both cities |
| 10:00 AM | 11:00 AM | Both cities |
| 11:00 AM | 12:00 PM | Both cities |
| 12:00 PM | 1:00 PM | Both cities |
| 1:00 PM | 2:00 PM | Both cities |
| 2:00 PM | 3:00 PM | Both cities |
| 3:00 PM | 4:00 PM | Both cities |
| 4:00 PM | 5:00 PM | Chicago only |
| 5:00 PM | 6:00 PM | — |
| 6:00 PM | 7:00 PM | — |
| 7:00 PM | 8:00 PM | — |
| 8:00 PM | 9:00 PM | — |
| 9:00 PM | 10:00 PM | — |
| 10:00 PM | 11:00 PM | — |
| 11:00 PM | 12:00 AM next day | — |
Understanding the Chicago – Ottawa Time Difference
Chicago runs on America/Chicago, currently CDT (UTC-5:00). Ottawa runs on America/Toronto, currently EDT (UTC-4:00). 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.
Chicago today
Ottawa today
Frequently Asked Questions
What is the time difference between Chicago and Ottawa?
Ottawa is currently 1 hour ahead of Chicago. This difference holds all year — no clock change in either city moves it.
How many hours ahead is Ottawa from Chicago?
Ottawa is 1 hour ahead of Chicago. Looking at it the other way, Chicago is 1 hour behind Ottawa.
What time is it in Ottawa when it is 9:00 AM in Chicago?
When it is 9:00 AM in Chicago, it is 10:00 AM in Ottawa.
Is Ottawa ahead of or behind Chicago?
Ottawa is 1 hour ahead of Chicago. Ottawa reaches each point in the day first, so its working day is already finishing while Chicago is still getting started.
What is the best time to call between Chicago and Ottawa?
Between 9:00 AM and 4:00 PM Chicago time, which is 10:00 AM to 5:00 PM in Ottawa. Both cities are inside normal business hours during that window.
Does the time difference between Chicago and Ottawa change during the year?
No. The difference between Chicago and Ottawa stays fixed all year round — no clock change in either city moves it.
What time zones are Chicago and Ottawa in?
Chicago uses the America/Chicago time zone, currently CDT (UTC-5:00). Ottawa uses America/Toronto, currently EDT (UTC-4:00).