Seoul is usually 14 hours ahead of Chicago. Chicago observes daylight saving time and Seoul does not, so the difference shifts by an hour around the changeovers.

SeoulChicago

Sunrise 5:26 AMSunset 7:52 PM(local)

Sunrise 5:32 AMSunset 8:23 PM(local)

Chicago: daylight saving timeNow UTC-5 CDT. Next change: November 1, 2026 β€” clocks go back 1 hour.
SeoulUTC+9
ChicagoUTC-5CDT

πŸ‡°πŸ‡· Seoul

Dialing code+82
Population10,349,312
Coordinates37.57Β°N, 126.98Β°E
Elevation38 m

πŸ‡ΊπŸ‡Έ Chicago

Dialing code+1
Population2,664,452
Coordinates41.85Β°N, 87.65Β°W
Elevation179 m

No comfortable common working hours β€” these cities barely overlap.

Working hours assumed 9:00–18:00.

Frequently asked questions

What is the time difference between Seoul and Chicago?
Seoul is 14 hours ahead of Chicago. Use the side-by-side clocks and the day/night strips above to convert any hour between them.
When is the best time to call between Seoul and Chicago?
There is no hour when standard working hours (9:00–18:00) overlap in both Seoul and Chicago, so any call falls outside business hours for at least one side.
Why does the time difference between Seoul and Chicago change?
Because at least one of Seoul and Chicago observes daylight saving time, the difference shifts by an hour when one city changes its clocks and the other has not yet (or does not).