What time is it in Seoul when it's 9 AM in Chicago?

11:00 PM — as of 6 October 2026. Seoul is 14 hours ahead of Chicago.

Does the time difference between Chicago and Seoul change?

Yes. In 2026 it's 15 hours or 14 hours, depending on the date, because only Chicago changes its clocks.

What's the best time for a call between Chicago and Seoul?

There's no hour when both cities are in working hours (09:00–17:00). The fairest is around 19:00 in Chicago (09:00 in Seoul).

What time zones are Chicago and Seoul in?

Chicago uses America/Chicago (UTC−5 today); Seoul uses Asia/Seoul (UTC+9 today).

Time difference between Chicago and Seoul

Seoul is 14 hours ahead of Chicago. When it's 9:00 in Chicago, it's 23:00 in Seoul.

From

Seoul is 14 hours ahead of Chicago.

On Tuesday, 6 October 2026, 09:00 in Chicago is 23:00 in Seoul. Chicago is UTC−5; Seoul is UTC+9.

The gap through 2026

1 Jan – 8 MarSeoul is 15 hours ahead of Chicago.
8 Mar – 1 NovSeoul is 14 hours ahead of Chicago.
1 Nov – 31 DecSeoul is 15 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 Seoul, hour by hour

On Tuesday 6 October.

Chicago	Seoul
07:00 Early morning	21:00 Evening
08:00 Early morning	22:00 Sleeping hours
09:00 Working hours	23:00 Sleeping hours
10:00 Working hours	00:00+1 Sleeping hours
11:00 Working hours	01:00+1 Sleeping hours
12:00 Working hours	02:00+1 Sleeping hours
13:00 Working hours	03:00+1 Sleeping hours
14:00 Working hours	04:00+1 Sleeping hours
15:00 Working hours	05:00+1 Sleeping hours
16:00 Working hours	06:00+1 Sleeping hours
17:00 Evening	07:00+1 Early morning
18:00 Evening	08:00+1 Early morning
19:00 Evening	09:00+1 Working hours
20:00 Evening	10:00+1 Working hours
21:00 Evening	11:00+1 Working hours
22:00 Sleeping hours	12:00+1 Working 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 Jan – 8 MarSeoul is 15 hours ahead of Chicago.
8 Mar – 1 NovSeoul is 14 hours ahead of Chicago.
1 Nov – 31 DecSeoul is 15 hours ahead of Chicago.

Best times for a call

Working hours (09:00–17:00) in Chicago and Seoul don't overlap, so any call is early or late for someone.

Chicago 19:00EveningSeoul 09:00 +1Working hours
Chicago 20:00EveningSeoul 10:00 +1Working hours
Chicago 21:00EveningSeoul 11:00 +1Working hours

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 Seoul when it's 9 AM in Chicago?: 11:00 PM — as of 6 October 2026. Seoul is 14 hours ahead of Chicago.
Does the time difference between Chicago and Seoul change?: Yes. In 2026 it's 15 hours or 14 hours, depending on the date, because only Chicago changes its clocks.
What's the best time for a call between Chicago and Seoul?: There's no hour when both cities are in working hours (09:00–17:00). The fairest is around 19:00 in Chicago (09:00 in Seoul).
What time zones are Chicago and Seoul in?: Chicago uses America/Chicago (UTC−5 today); Seoul uses Asia/Seoul (UTC+9 today).

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