| Welkom Ifran | Western European Time | 02:00 |
| Welkom Idlib | Eastern European Time | 00:00 |
| Welkom Idukki Township | India Standard Time | -03:30 |
| Welkom Idyllwild-Pine Cove | Pacific Time | 10:00 |
| Welkom Ichikawa | Japan Time | -07:00 |
| Welkom Idar | India Standard Time | -03:30 |
| Welkom Idalia | Eastern Australia Time | -08:00 |
| Welkom Illueca | Central European Time | 01:00 |
| Welkom Ilavala Hobli | India Standard Time | -03:30 |
| Welkom Ileret | East Africa Time | -01:00 |
| Welkom Iligan City | Philippine Time | -06:00 |
| Welkom Ilford | United Kingdom Time | 02:00 |
| Welkom Ilfracombe | United Kingdom Time | 02:00 |
| Welkom Ikšķile | Eastern European Time | 00:00 |
| Welkom Humboldt | Central Time | 08:00 |
| Welkom Hunter River | Atlantic Time | 06:00 |
| Welkom Hulshout | Central European Time | 01:00 |
| Welkom Hultsfred | Central European Time | 01:00 |
| Welkom Hulu Langat | Malaysia Time | -06:00 |
| Welkom Huixquilucan de Degollado | Central Time | 08:00 |
| Welkom Hudson | Eastern Time | 07:00 |
| Welkom Hudson Oaks | Central Time | 08:00 |
| Welkom Hubali-Dharwad | India Standard Time | -03:30 |
| Welkom Huez | Central European Time | 01:00 |
| Welkom Hudsonville | Eastern Time | 07:00 |
| Welkom Huehuetoca | Central Time | 08:00 |
| Welkom Hyde Park | Eastern Australia Time | -08:00 |
| Welkom Hyderabad | India Standard Time | -03:30 |
| Welkom Hyderabad | India Standard Time | -03:30 |
| Welkom Hyderabad | India Standard Time | -03:30 |
| Welkom Hyderabad | India Standard Time | -03:30 |
| Welkom Huntingdale | Western Australia Time | -06:00 |
| Welkom Huttons Ambo | United Kingdom Time | 02:00 |
| Welkom Huskisson | Eastern Australia Time | -09:00 |
| Welkom Húsavík | Greenwich Mean Time | 02:00 |
| Welkom Husborne Crawley | United Kingdom Time | 02:00 |
| Welkom Hurstville | Eastern Australia Time | -09:00 |
| Welkom Hurricane | Mountain Time | 09:00 |