Best time to call Seoul from Chicago
There is no 9-to-5 overlap between these cities. Best compromise: 5 PM–10 PM in Chicago (7 AM–12 PM the next day in Seoul), both sides are at least awake (7 AM–10 PM). Seoul is 14 hours ahead of Chicago. (as of July 2026, recalculated live in your browser.)
Live from your device clock via the IANA time-zone database built into your browser.
Hour-by-hour overlap
Both 9 AM–5 PM Both awake (7 AM–10 PM) One side asleep
| Chicago | Seoul | Call quality |
|---|---|---|
| 12 AM | 2 PM | Too early / too late |
| 1 AM | 3 PM | Too early / too late |
| 2 AM | 4 PM | Too early / too late |
| 3 AM | 5 PM | Too early / too late |
| 4 AM | 6 PM | Too early / too late |
| 5 AM | 7 PM | Too early / too late |
| 6 AM | 8 PM | Too early / too late |
| 7 AM | 9 PM | One side off-hours |
| 8 AM | 10 PM | Too early / too late |
| 9 AM | 11 PM | Too early / too late |
| 10 AM | 12 AM +1 day | Too early / too late |
| 11 AM | 1 AM +1 day | Too early / too late |
| 12 PM | 2 AM +1 day | Too early / too late |
| 1 PM | 3 AM +1 day | Too early / too late |
| 2 PM | 4 AM +1 day | Too early / too late |
| 3 PM | 5 AM +1 day | Too early / too late |
| 4 PM | 6 AM +1 day | Too early / too late |
| 5 PM | 7 AM +1 day | One side off-hours |
| 6 PM | 8 AM +1 day | One side off-hours |
| 7 PM | 9 AM +1 day | One side off-hours |
| 8 PM | 10 AM +1 day | One side off-hours |
| 9 PM | 11 AM +1 day | One side off-hours |
| 10 PM | 12 PM +1 day | Too early / too late |
| 11 PM | 1 PM +1 day | Too early / too late |
Grid prerendered July 2026 and recomputed in your browser on load, so daylight-saving switches are always reflected. Chicago observes daylight saving time but Seoul does not, so the time difference changes twice a year.
Frequently asked questions
How many hours ahead is Seoul of Chicago?
Seoul is 14 hours ahead of Chicago. (Checked July 2026; where daylight saving applies, the gap can shift by an hour part of the year, the page recalculates live.)
What time is 9 AM in Chicago in Seoul?
9 AM in Chicago is 11 PM in Seoul.
Do Chicago and Seoul change clocks for daylight saving?
Chicago observes daylight saving time but Seoul does not, so the time difference changes twice a year.
Which hours work for a call?
There is no 9-to-5 overlap between these cities. Best compromise: 5 PM–10 PM in Chicago (7 AM–12 PM the next day in Seoul), both sides are at least awake (7 AM–10 PM).