Chicago
United States
--:-- --
CST · UTC-6 6 hours difference
London
United Kingdom
--:-- --
GMT · UTC+0 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
✅ Overlap: 9:00 AM–12:00 PM in Chicago · 3:00 PM–6:00 PM in London (3h window)
⚠ 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 |
Both working Working Off hours Sleeping Now
Key Facts: Chicago (CST) vs London (GMT)
Time Gap
6h
London ahead
May vary ±1h (DST)
DST Status
⏰ Chicago
Observes DST
⏰ London: Observes DST
Cities in CST
250
Largest: Chicago
8,489,066 pop.
Overlap Window
3h window
9:00 AM – 12:00 PM (CST)
3:00 PM – 6:00 PM (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
McAllen, USBirmingham, USWinnipeg, CATulsa, USBaton Rouge, USReynosa, MXDes Moines, USHeroica Matamoros, MXWichita, USLittle Rock, USMadison, USDenton, USFayetteville, USPensacola, USArlington, USNuevo Laredo, MXHuntsville, USCorpus Christi, USJackson, USMobile, USSt. Paul, USLincoln, USSpringfield, USPlano, USLubbock, USDavenport, USShreveport, USRockford, USPeoria, USKilleen, USLaredo, USIrving, USRound Lake Beach, USMontgomery, USGarland, USAppleton, USGulfport, USLafayette, USGreen Bay, USFargo, USBrownsville, USClarksville, USCollege Station, USFrisco, USSioux Falls, USEvansville, USAmarillo, USGalveston, USMcKinney, USGrand Prairie, USWaco, USOverland Park, USCedar Rapids, USMurfreesboro, USAurora, USPanama City, USPiedras Negras, MXTuscaloosa, USOdessa, USCiudad Acuna, MXTopeka, USJoliet, USNaperville, USPasadena, USMesquite, USChampaign, USHouma, USBeaumont, USLake Charles, USOlathe, USMidland, USColumbia, USMetairie, USRacine, USBloomington, USCarrollton, USTyler, USIowa City, USNorman, USFort Smith, USLewisville, USAbilene, USPearland, USKenosha, USRound Rock, USTemple, USRochester, USIndependence, USDuluth, USRichardson, USMonroe, USThe Woodlands, USSt. Cloud, USBroken Arrow, USHarlingen, USMandeville, USLeague City, USPort Arthur, USElgin, USWaterloo, USSioux City, USLongview, USSugar Land, USEau Claire, USAuburn, USAllen, USLee's Summit, USEdinburg, USWichita Falls, USBowling Green, USCiudad Rio Bravo, MXSan Angelo, USBismarck, USNew Braunfels, USConroe, USLawrence, USEdmond, USSlidell, USAtascocita, USLa Crosse, USO'Fallon, USHoover, USLawton, USWaukegan, USJoplin, USSpringdale, USMission, USBryan, USFranklin, USDecatur, USBaytown, USBrooklyn Park, USCicero, USHattiesburg, USOwensboro, USFlorence, USPharr, USPlymouth, USJonesboro, USGeorgetown, USTexarkana, USFlower Mound, USAlton, USCedar Park, USHammond, USWoodbury, USSchaumburg, USEvanston, USSt. Joseph, USWausau, USAnniston, USArlington Heights, USOshkosh, USMansfield, USMissouri City, USJanesville, USSan Marcos, USDothan, USSherman, USBolingbrook, USAlexandria, USSheboygan, USLakeville, USRogers, USBlaine, USSt. Charles, USWaukesha, USAnkeny, USMaple Grove, USNorth Richland Hills, USConway, USWest Des Moines, USSpring Hill, USGrand Forks, USMichigan City, USGary, USValle Hermoso, MXDubuque, USShawnee, USEagan, USKankakee, USLeander, USSpring, USPalatine, USVictoria, US
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
Belfast, GBReading, GBKingston upon Hull, GBNewcastle, GBStockport, GBBradford, GBNottingham, GBBolton, GBSunderland, GBPlymouth, GBMilton Keynes, GBDerby, GBWestminster, GBWolverhampton, GBAbertawe, GBBarnsley, GBStoke-on-Trent, GBSwindon, GBNorwich, GBLuton, GBSolihull, GBIslington, GBAberdeen, GBPeterborough, GBCroydon, GBBournemouth, GBBasildon, GBSaint Helens, GBIlford, GBWarrington, GBHuddersfield, GBSouthend, GBNewport, GBEnfield, GBIpswich, GBHarrow, GBDundee, GBWest Bromwich, GBGloucester, GBPoole, GBTelford, GBPreston, GBYork, GBMiddlesbrough, GBBlackpool, GBNorthampton, GBBrighton, GBSale, GBLincoln, GBTottenham, GBExeter, GBCambridge, GBRomford, GBColchester, GBHigh Wycombe, GBGateshead, GBSlough, GBBlackburn, GBCheltenham, GBChelmsford, GBRochdale, GBWythenshawe, GBBirkenhead, GBDoncaster, GBRotherham, GBMaidstone, GBWalthamstow, GBOxford, GBBasingstoke, GBCrawley, GBDagenham, GBGillingham, GBHalifax, GBSalford, GBWigan, GBHounslow, GBWembley, GBWorcester, GBEastbourne, GBWakefield, GBOldham, GBSutton Coldfield, GBHammersmith, GBHemel Hempstead, GBBath, GBHayes, GBDarlington, GBWimbledon, GBBedford, GBHove, GBSouthport, GBHastings, GBOrpington, GBWatford, GBStevenage, GBGrimsby, GBHartlepool, GBBromley, GBChester, GBFulham, GBNuneaton, GBDerry, GBEaling, GBWoolwich, GBAylesbury, GBAshford, GBStockton-on-Tees, GBSaint Albans, GBHarlow, GBBurnley, GBRedditch, GBEdmonton, GBBatley, GBScunthorpe, GBDudley, GBBury, GBEastleigh, GBBrixton, GBSouthall, GBPaisley, GBGuildford, GBChatham, GBEast Ham, GBWeston-super-Mare, GBCarlisle, GBSouth Shields, GBEast Kilbride, GBNewcastle under Lyme, GBBurton upon Trent, GBGravesend, GBTamworth, GBHarrogate, GBShrewsbury, GBGosport, GBLisburn, GBRugby, GBStafford, GBChingford, GBUxbridge, GBMansfield, GBRhondda, GBTynemouth, GBCannock, GBWalsall, GBWashington, GBGrays, GBWalton upon Thames, GBFinchley, GBThornton Heath, GBFarnborough, GBLoughborough, GBKensington, GBBoston, GBPaignton, GBWaterlooville, GBGuiseley, GBHornchurch, GBMaidenhead, GBMitcham, GBFeltham, GBStourbridge, GBRochester, GBDewsbury, GBWoking, GBActon, GBTwickenham, GBRuncorn, GBWrecsam, GBWidnes, GBMargate, GBEllesmere Port, GBBangor, GBTaunton, GBWallasey, GBHalesowen, GBBracknell, GBBarking, GBSutton, GBMerthyr Tudful, GBEdgware, GBRuislip, GBStreatham, GBRoyal Tunbridge Wells, GBBebington, GBAldershot, GB
⚠️ 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.