| Suginami Ifran | Western European Time | 09:00 |
| Suginami Idlib | Eastern European Time | 07:00 |
| Suginami Idukki Township | India Standard Time | 03:30 |
| Suginami Idyllwild-Pine Cove | Pacific Time | 17:00 |
| Suginami Ichikawa | Japan Time | 00:00 |
| Suginami Idar | India Standard Time | 03:30 |
| Suginami Idalia | Eastern Australia Time | -01:00 |
| Suginami Illueca | Central European Time | 08:00 |
| Suginami Ilavala Hobli | India Standard Time | 03:30 |
| Suginami Ileret | East Africa Time | 06:00 |
| Suginami Iligan City | Philippine Time | 01:00 |
| Suginami Ilford | United Kingdom Time | 09:00 |
| Suginami Ilfracombe | United Kingdom Time | 09:00 |
| Suginami Ikšķile | Eastern European Time | 07:00 |
| Suginami Humboldt | Central Time | 15:00 |
| Suginami Hunter River | Atlantic Time | 13:00 |
| Suginami Hulshout | Central European Time | 08:00 |
| Suginami Hultsfred | Central European Time | 08:00 |
| Suginami Hulu Langat | Malaysia Time | 01:00 |
| Suginami Huixquilucan de Degollado | Central Time | 15:00 |
| Suginami Hudson | Eastern Time | 14:00 |
| Suginami Hudson Oaks | Central Time | 15:00 |
| Suginami Hubali-Dharwad | India Standard Time | 03:30 |
| Suginami Huez | Central European Time | 08:00 |
| Suginami Hudsonville | Eastern Time | 14:00 |
| Suginami Huehuetoca | Central Time | 15:00 |
| Suginami Hyde Park | Eastern Australia Time | -01:00 |
| Suginami Hyderabad | India Standard Time | 03:30 |
| Suginami Hyderabad | India Standard Time | 03:30 |
| Suginami Hyderabad | India Standard Time | 03:30 |
| Suginami Hyderabad | India Standard Time | 03:30 |
| Suginami Huntingdale | Western Australia Time | 01:00 |
| Suginami Huttons Ambo | United Kingdom Time | 09:00 |
| Suginami Huskisson | Eastern Australia Time | -02:00 |
| Suginami Húsavík | Greenwich Mean Time | 09:00 |
| Suginami Husborne Crawley | United Kingdom Time | 09:00 |
| Suginami Hurstville | Eastern Australia Time | -02:00 |
| Suginami Hurricane | Mountain Time | 16:00 |