Time difference between Chicago and Buenos Aires
Buenos Aires is 2 hours ahead of Chicago
Chicago, the United States is UTC−6 · Buenos Aires, Argentina is UTC−3 — on standard time
The gap is not the same all year
Every converter gives one number for this pair. That number is right for most of the year and wrong for part of it, because Chicago goes forward on the second Sunday in March and back on the first Sunday in November and Buenos Aires does not change its clocks.
| Chicago / Buenos Aires clocks | Difference | How long |
|---|---|---|
| summer / standard | 2 hours ahead | about 34 weeks — most of the year |
| standard / standard | 3 hours ahead | about 18 weeks |
Buenos Aires stays put all year while Chicago moves, so a meeting fixed in Buenos Aires's calendar shifts by an hour twice a year at Chicago's end.
When they can both be at their desks
Nine-to-five in both cities overlaps for 6 hours — 9:00 AM to 3:00 PM in Chicago, the same moment as 11:00 AM to 5:00 PM in Buenos Aires.
Chicago to Buenos Aires, hour by hour
| Chicago | Buenos Aires |
|---|---|
| 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 | 12:00 AM (next day) |
| 11:00 PM | 1:00 AM (next day) |
On the usual gap of 2 hours.
Frequently asked questions
What is the time difference between Chicago and Buenos Aires?
Buenos Aires is 2 hours ahead of Chicago for most of the year. It is not the same all year — there is one other gap, because Chicago goes forward on the second Sunday in March and back on the first Sunday in November and Buenos Aires does not change its clocks.
Is Buenos Aires ahead of Chicago?
Yes — Buenos Aires is 2 hours ahead. Chicago is UTC−6 and Buenos Aires is UTC−3 on standard time.
What time is 9 AM in Chicago in Buenos Aires?
11:00 AM, on the usual gap.
When can Chicago and Buenos Aires meet?
Standard nine-to-five hours overlap for 6 hours: 9:00 AM–3:00 PM in Chicago, which is 11:00 AM–5:00 PM in Buenos Aires.
Other pairs
- Chicago to Lima
- Chicago to Lagos
- Chicago to Johannesburg
- Chicago to Nairobi
- Mexico City to London
- Mexico City to Dublin
- Mexico City to Lisbon
- Mexico City to Paris
- Mexico City to Berlin
- Mexico City to Madrid
Every Chicago pair · Every Buenos Aires pair · All city pairs · Time zones by abbreviation