| Seoul Hong | Central European Time | 08:00 |
| Seoul Hong Kong | Hong Kong Time | 01:00 |
| Seoul Hong Kong | Hong Kong Time | 01:00 |
| Seoul Hong Kong | Hong Kong Time | 01:00 |
| Seoul Hounslow | United Kingdom Time | 09:00 |
| Seoul Hotchkiss | Mountain Time | 16:00 |
| Seoul Hoylake | United Kingdom Time | 09:00 |
| Seoul Howell | Eastern Time | 14:00 |
| Seoul Howrah | India Standard Time | 03:30 |
| Seoul Hoxie | Central Time | 15:00 |
| Seoul Huanggang | China Time | 01:00 |
| Seoul Huajuapan de León | Central Time | 15:00 |
| Seoul Himmelkron | Central European Time | 08:00 |
| Seoul Hima | East Africa Time | 06:00 |
| Seoul Hillsborough | Eastern Time | 14:00 |
| Seoul Hioki | Japan Time | 00:00 |
| Seoul Hiram | Eastern Time | 14:00 |
| Seoul Hingham | Eastern Time | 14:00 |
| Seoul Hochdorf | Central European Time | 08:00 |
| Seoul Hitzacker | Central European Time | 08:00 |
| Seoul Homebush | Eastern Australia Time | -02:00 |
| Seoul Hondarribia | Central European Time | 08:00 |
| Seoul Homps | Central European Time | 08:00 |
| Seoul Holywood | United Kingdom Time | 09:00 |
| Seoul Holmes Beach | Eastern Time | 14:00 |
| Seoul Holme's Hill | United Kingdom Time | 09:00 |
| Seoul Hollywood | Eastern Time | 14:00 |
| Seoul Holly Hill | Eastern Time | 14:00 |
| Seoul Holly Hill | Eastern Time | 14:00 |
| Seoul Hokes Bluff | Central Time | 15:00 |
| Seoul Hokuto | Japan Time | 00:00 |
| Seoul Holden Hill | Central Australia Time | -01:30 |
| Seoul Holdenville | Central Time | 15:00 |
| Seoul Holdorf | Central European Time | 08:00 |
| Seoul Holdrege | Central Time | 15:00 |
| Seoul Holesov | Central European Time | 08:00 |
| Seoul Holgate | Eastern Australia Time | -02:00 |
| Seoul Hogsback | South Africa Standard Time | 07:00 |
| Seoul Hofheim | Central European Time | 08:00 |
| Seoul Hoge Hexel | Central European Time | 08:00 |
| Seoul Heubach | Central European Time | 08:00 |
| Seoul Hethersett | United Kingdom Time | 09:00 |
| Seoul Hewlett | Eastern Time | 14:00 |
| Seoul Hexham | Eastern Australia Time | -02:00 |
| Seoul Hexham | United Kingdom Time | 09:00 |
| Seoul Heydon | United Kingdom Time | 09:00 |
| Seoul Highgate | Western Australia Time | 01:00 |
| Seoul High Falls | Eastern Time | 14:00 |
| Seoul Higashiyama Ward | Japan Time | 00:00 |
| Seoul Higashi Ward | Japan Time | 00:00 |