Convert Chicago (CST) to London (GMT) Time — 6 hours apart
America/Chicago · CST · UTC-6 | Europe/London · GMT · UTC+0 · 6 hours difference · 486 cities · DST applies
24-Hour Overlap Timeline
⚠ Chicago and London observe daylight saving time — offset may vary by up to 1 hour seasonally
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UTC → | ||||||||||||||||||||||||
| 🇺🇸 Chicago UTC-6 | 6p | 7p | 8p | 9p | 10p | 11p | 12a | 1a | 2a | 3a | 4a | 5a | 6a | 7a | 8a | 9a | 10a | 11a | 12p | 1p | 2p | 3p | 4p | 5p |
| 🇬🇧 London UTC+0 | 12a | 1a | 2a | 3a | 4a | 5a | 6a | 7a | 8a | 9a | 10a | 11a | 12p | 1p | 2p | 3p | 4p | 5p | 6p | 7p | 8p | 9p | 10p | 11p |
Key Facts: Chicago (CST) vs London (GMT)
Find Cities in Chicago & London Timezones
The CST and GMT timezones are separated by 6 hours. Chicago is the largest city in the America/Chicago zone and London is the largest in Europe/London. Chicago observes daylight saving time — the difference may change by 1 hour seasonally. For scheduling between these regions, the key fact is: there are 3 hours of mutual business-hours overlap each day.
Best Times to Schedule Calls: Chicago (CST) ↔ London (GMT)
| Chicago (CST) | London (GMT) | Quality |
|---|---|---|
| 12:00 AM | 6:00 AM | ❌ |
| 1:00 AM | 7:00 AM | ❌ |
| 2:00 AM | 8:00 AM | ❌ |
| 3:00 AM | 9:00 AM | ❌ |
| 4:00 AM | 10:00 AM | ❌ |
| 5:00 AM | 11:00 AM | ❌ |
| 6:00 AM | 12:00 PM | ❌ |
| 7:00 AM | 1:00 PM | ⚠️ |
| 8:00 AM | 2:00 PM | ⚠️ |
| 9:00 AM | 3:00 PM | ✅ |
| 10:00 AM | 4:00 PM | ✅ |
| 11:00 AM | 5:00 PM | ✅ |
| 12:00 PM | 6:00 PM | ⚠️ |
| 1:00 PM | 7:00 PM | ⚠️ |
| 2:00 PM | 8:00 PM | ❌ |
| 3:00 PM | 9:00 PM | ❌ |
| 4:00 PM | 10:00 PM | ❌ |
| 5:00 PM | 11:00 PM | ❌ |
| 6:00 PM | 12:00 AM +1 day | ❌ |
| 7:00 PM | 1:00 AM +1 day | ❌ |
| 8:00 PM | 2:00 AM +1 day | ❌ |
| 9:00 PM | 3:00 AM +1 day | ❌ |
Work hours defined as 09:00–18:00 local time. ✅ Both in work hours ⚠️ Borderline ❌ Outside work hours.
CST to GMT: Complete 24-Hour Time Conversion Table
| Chicago (CST) | London (GMT) | IST (UTC+5:30) |
|---|---|---|
| 12:00 AM | 6:00 AM | 11:30 AM |
| 1:00 AM | 7:00 AM | 12:30 PM |
| 2:00 AM | 8:00 AM | 1:30 PM |
| 3:00 AM | 9:00 AM | 2:30 PM |
| 4:00 AM | 10:00 AM | 3:30 PM |
| 5:00 AM | 11:00 AM | 4:30 PM |
| 6:00 AM | 12:00 PM | 5:30 PM |
| 7:00 AM | 1:00 PM | 6:30 PM |
| 8:00 AM | 2:00 PM | 7:30 PM |
| 9:00 AM | 3:00 PM | 8:30 PM |
| 10:00 AM | 4:00 PM | 9:30 PM |
| 11:00 AM | 5:00 PM | 10:30 PM |
| 12:00 PM | 6:00 PM | 11:30 PM |
| 1:00 PM | 7:00 PM | 12:30 AM |
| 2:00 PM | 8:00 PM | 1:30 AM |
| 3:00 PM | 9:00 PM | 2:30 AM |
| 4:00 PM | 10:00 PM | 3:30 AM |
| 5:00 PM | 11:00 PM | 4:30 AM |
| ← Date changes in London → | ||
| 6:00 PM | 12:00 AM +1 | 5:30 AM |
| 7:00 PM | 1:00 AM +1 | 6:30 AM |
| 8:00 PM | 2:00 AM +1 | 7:30 AM |
| 9:00 PM | 3:00 AM +1 | 8:30 AM |
| 10:00 PM | 4:00 AM +1 | 9:30 AM |
| 11:00 PM | 5:00 AM +1 | 10:30 AM |
IST (India Standard Time, UTC+5:30) shown as reference for Indian users. +1/−1 indicates a different calendar day.
250 Cities in Chicago (CST) & 236 Cities in London (GMT) — Page 1 of 2
Chicago & 249 more — Chicago (CST, UTC-6)
- Chicago, US 8.5M
- Houston, US 6.0M
- Dallas, US 5.8M
- Minneapolis, US 2.9M
- St. Louis, US 2.1M
- San Antonio, US 2.1M
- Austin, US 1.9M
- Kansas City, US 1.7M
- Milwaukee, US 1.3M
- Nashville, US 1.2M
- Memphis, US 1.0M
- Oklahoma City, US 1.0M
- Fort Worth, US 941K
- New Orleans, US 919K
- Omaha, US 826K
London & 235 more — London (GMT, UTC+0)
- London, GB 11.3M
- Birmingham, GB 2.6M
- Portsmouth, GB 856K
- Southampton, GB 856K
- Bristol, GB 707K
- Glasgow, GB 626K
- Manchester, GB 548K
- Leeds, GB 536K
- Sheffield, GB 518K
- Liverpool, GB 513K
- Edinburgh, GB 488K
- Worthing, GB 474K
- Leicester, GB 464K
- Coventry, GB 363K
- Caerdydd, GB 361K
⚠️ Daylight Saving Time Affects This Pair
| Timezone | DST? | Standard | Daylight |
|---|---|---|---|
| America/Chicago | Yes | UTC-6 | UTC-5 |
| Europe/London | Yes | UTC+0 | UTC+1 |
During DST periods the time difference between these zones may be 6 hours instead of 6 hours. Always verify the current offset if scheduling calls near clock-change dates.