What is the time difference between Seoul and Chicago?

Chicago is 14 hours behind Seoul. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.

When is the best time to call Chicago from Seoul?

There is no time inside normal working hours in both cities, so someone has to take the call outside them. The nearest workable windows are listed above — pick one and alternate who gets the awkward slot.

Does Seoul observe daylight saving time?

No. Seoul stays on UTC+9 all year, so its clocks never move.

Does Chicago observe daylight saving time?

Yes. Chicago runs on UTC-6 in winter and UTC-5 in summer. The next change is on 2026-11-01, when clocks go back by 60 minutes.

If it is midday in Seoul, what time is it in Chicago?

It is 22:00 in Chicago, still on the previous day. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.

Which time zones do Seoul and Chicago use?

Seoul uses Asia/Seoul, currently UTC+9, and Chicago uses America/Chicago, currently UTC-5 (CDT). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.

Convert Seoul time to Chicago time

Chicago is 14 hours behind Seoul right now, so midday in Seoul lands in the late night in Chicago.

Convert a time

From

Date

Time

Converted time

—

The converter needs JavaScript to run. Everything below — offsets, daylight saving dates and the hour-by-hour table — is part of the page and works without it.

Hour by hour

The whole day mapped across: read down the left for Seoul, across for Chicago.

Seoul	Chicago
00:00	10:00previous day
01:00	11:00previous day
02:00	12:00previous day
03:00	13:00previous day
04:00	14:00previous day
05:00	15:00previous day
06:00	16:00previous day
07:00	17:00previous day
08:00	18:00previous day
09:00	19:00previous day
10:00	20:00previous day
11:00	21:00previous day
12:00	22:00previous day
13:00	23:00previous day
14:00	00:00
15:00	01:00
16:00	02:00
17:00	03:00
18:00	04:00
19:00	05:00
20:00	06:00
21:00	07:00
22:00	08:00
23:00	09:00

Daylight saving time

Chicago changes its clocks; Seoul does not. The difference between them therefore shifts by an hour twice a year.

Seoul

Does not observe daylight saving time

Standard: UTC+9

Chicago

Observes daylight saving time

Standard: UTC-6
Daylight: UTC-5
Next change: 2026-11-01 −60m

When you can actually talk

There is no hour where both cities are inside a 09:00–18:00 working day. Someone has to move — the nearest workable windows are below.

Seoul 09:00–18:00Chicago 19:00–04:00
Seoul 23:00–08:00Chicago 09:00–18:00

Reference

The zone identifiers and offsets behind everything above.

	Seoul	Chicago
IANA zone	Asia/Seoul	America/Chicago
Abbreviation	UTC+9	CDT
Standard offset	UTC+9	UTC-6
Daylight offset	—	UTC-5
Clock changes this year	0	2
Country	South Korea	United States

Example, not the current time. Live times appear once the page loads.

Common questions

What is the time difference between Seoul and Chicago?: Chicago is 14 hours behind Seoul. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.
When is the best time to call Chicago from Seoul?: There is no time inside normal working hours in both cities, so someone has to take the call outside them. The nearest workable windows are listed above — pick one and alternate who gets the awkward slot.
Does Seoul observe daylight saving time?: No. Seoul stays on UTC+9 all year, so its clocks never move.
Does Chicago observe daylight saving time?: Yes. Chicago runs on UTC-6 in winter and UTC-5 in summer. The next change is on 2026-11-01, when clocks go back by 60 minutes.
If it is midday in Seoul, what time is it in Chicago?: It is 22:00 in Chicago, still on the previous day. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.
Which time zones do Seoul and Chicago use?: Seoul uses Asia/Seoul, currently UTC+9, and Chicago uses America/Chicago, currently UTC-5 (CDT). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.