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Time difference between Chicago and Buenos Aires

Buenos Aires is 2 hours ahead of Chicago. When it's 9:00 in Chicago, it's 11:00 in Buenos Aires.

Buenos Aires is 2 hours ahead of Chicago.

On Tuesday, 6 October 2026, 09:00 in Chicago is 11:00 in Buenos Aires. Chicago is UTC−5; Buenos Aires is UTC−3.

The gap through 2026

  1. 1 Jan – 8 MarBuenos Aires is 3 hours ahead of Chicago.
  2. 8 Mar – 1 NovBuenos Aires is 2 hours ahead of Chicago.
  3. 1 Nov – 31 DecBuenos Aires is 3 hours ahead of Chicago.
  • Chicago moves its clocks forward on 8 March (UTC−6 → UTC−5).
  • Chicago moves its clocks back on 1 November (UTC−5 → UTC−6).

Chicago to Buenos Aires, hour by hour

On Tuesday 6 October.

ChicagoBuenos Aires
07:00 Early morning09:00 Working hours
08:00 Early morning10:00 Working hours
09:00 Working hours11:00 Working hours
10:00 Working hours12:00 Working hours
11:00 Working hours13:00 Working hours
12:00 Working hours14:00 Working hours
13:00 Working hours15:00 Working hours
14:00 Working hours16:00 Working hours
15:00 Working hours17:00 Evening
16:00 Working hours18:00 Evening
17:00 Evening19:00 Evening
18:00 Evening20:00 Evening
19:00 Evening21:00 Evening
20:00 Evening22:00 Sleeping hours
21:00 Evening23:00 Sleeping hours
22:00 Sleeping hours00:00+1 Sleeping hours

Daylight saving in 2026

  • Chicago moves its clocks forward on Sunday 8 March (UTC−6 → UTC−5).
  • Chicago moves its clocks back on Sunday 1 November (UTC−5 → UTC−6).
  1. 1 Jan – 8 MarBuenos Aires is 3 hours ahead of Chicago.
  2. 8 Mar – 1 NovBuenos Aires is 2 hours ahead of Chicago.
  3. 1 Nov – 31 DecBuenos Aires is 3 hours ahead of Chicago.

Best times for a call

Working hours (09:00–17:00) overlap for 6 hours: 09:00–15:00 in Chicago, which is 11:00–17:00 in Buenos Aires.

  • Chicago 09:00Working hoursBuenos Aires 11:00Working hours
  • Chicago 10:00Working hoursBuenos Aires 12:00Working hours
  • Chicago 11:00Working hoursBuenos Aires 13:00Working hours

More time differences for Chicago and Buenos Aires

How the time difference calculator works

The difference is each city's offset from UTC on the date you pick, subtracted. Offsets come from the IANA time zone database in your browser.

Because countries change their clocks on different dates — or not at all — the gap between two cities can change for a few weeks a year. The calculator lists every change in the year.

Examples

  • London is 5 hours ahead of New York for most of the year, but only 4 hours ahead for about three weeks in March and one week in late October.
  • Dubai doesn't change its clocks, so its gap to London is 4 hours in winter and 3 hours in summer.

Good for

  • Knowing when a colleague's day starts
  • Setting expectations for replies across time zones
  • Planning travel and jet lag

Frequently asked questions

What time is it in Buenos Aires when it's 9 AM in Chicago?
11:00 AM — as of 6 October 2026. Buenos Aires is 2 hours ahead of Chicago.
Does the time difference between Chicago and Buenos Aires change?
Yes. In 2026 it's 3 hours or 2 hours, depending on the date, because only Chicago changes its clocks.
What's the best time for a call between Chicago and Buenos Aires?
Between 09:00 and 15:00 Chicago time, when both cities are in working hours (09:00–17:00).
What time zones are Chicago and Buenos Aires in?
Chicago uses America/Chicago (UTC−5 today); Buenos Aires uses America/Argentina/Buenos_Aires (UTC−3 today).

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