Ontario to Chicago time converter
Chicago is 1 hour behind Ontario. When it is 9:00 AM in Ontario, it is 8:00 AM in Chicago.
3:10 PM in Ontario, Friday, October 16, 2026
Shared working hours (9:00–18:00)
Ontario to Chicago conversion table
Every hour of today in Ontario and the matching time in Chicago. Light rows are typical working hours (9:00–18:00).
| Ontario | Chicago |
|---|---|
| 12:00 AM | 11:00 PM−1 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 |
| 10:00 AM | 9:00 AM |
| 11:00 AM | 10:00 AM |
| 12:00 PM | 11:00 AM |
| 1:00 PM | 12:00 PM |
| 2:00 PM | 1:00 PM |
| 3:00 PM | 2:00 PM |
| 4:00 PM | 3:00 PM |
| 5:00 PM | 4:00 PM |
| 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 |
Best time to call or meet
Both sides are at work from 10:00 AM – 6:00 PM in Ontario (9:00 AM – 5:00 PM in Chicago).
Daylight saving time and the difference
The difference changes during the year because Ontario and Chicago switch clocks on different dates:
- Oct 16, 2026 – Nov 1, 2026: -1h
- Nov 1, 2026 – Nov 1, 2026: ±0
- Nov 1, 2026 – Mar 14, 2027: -1h
- Mar 14, 2027 – Mar 14, 2027: -2h
- Mar 14, 2027 – Oct 16, 2027: -1h
More conversions
Questions and answers
What is the time difference between Ontario and Chicago?
Chicago is 1 hour behind Ontario.
What time is it in Chicago when it is 9 AM in Ontario?
When it is 9:00 AM in Ontario, it is 8:00 AM in Chicago.
When is the best time to call Chicago from Ontario?
Both sides are at work from 10:00 AM – 6:00 PM in Ontario (9:00 AM – 5:00 PM in Chicago).
Does the time difference between Ontario and Chicago change?
Yes, for part of the year, because daylight saving time starts and ends on different dates or applies on one side only.