| Seongnam-si Jinan | China Time | 01:00 |
| Seongnam-si Chennai | India Standard Time | 03:30 |
| Seongnam-si Zhengzhou | China Time | 01:00 |
| Seongnam-si Melbourne | Eastern Australia Time | -02:00 |
| Seongnam-si Riyadh | Arabian Time | 06:00 |
| Seongnam-si Changchun | China Time | 01:00 |
| Seongnam-si Dalian | China Time | 01:00 |
| Seongnam-si Los Angeles | Pacific Time | 17:00 |
| Seongnam-si Chittagong | Bangladesh Time | 03:00 |
| Seongnam-si Kunming | China Time | 01:00 |
| Seongnam-si Alexandria | Eastern European Time | 07:00 |
| Seongnam-si Ahmedabad | India Standard Time | 03:30 |
| Seongnam-si Qingdao | China Time | 01:00 |
| Seongnam-si Busan | Korean Time | 00:00 |
| Seongnam-si Abidjan | Greenwich Mean Time | 09:00 |
| Seongnam-si Kano | West Africa Time | 08:00 |
| Seongnam-si Foshan | China Time | 01:00 |
| Seongnam-si Hyderabad | India Standard Time | 03:30 |
| Seongnam-si Puyang | China Time | 01:00 |
| Seongnam-si Yokohama | Japan Time | 00:00 |
| Seongnam-si Ibadan | West Africa Time | 08:00 |
| Seongnam-si Singapore | Singapore Standard Time | 01:00 |
| Seongnam-si Wuxi | China Time | 01:00 |
| Seongnam-si Xiamen | China Time | 01:00 |
| Seongnam-si Ankara | Turkey Time | 06:00 |
| Seongnam-si Tianshui | China Time | 01:00 |
| Seongnam-si Ningbo | China Time | 01:00 |
| Seongnam-si Ho Chi Minh City | Indochina Time | 02:00 |
| Seongnam-si Shiyan | China Time | 01:00 |
| Seongnam-si Cape Town | South Africa Standard Time | 07:00 |
| Seongnam-si Taiyuan | China Time | 01:00 |
| Seongnam-si Berlin | Central European Time | 08:00 |
| Seongnam-si Tangshan | China Time | 01:00 |
| Seongnam-si Hefei | China Time | 01:00 |
| Seongnam-si Madrid | Central European Time | 08:00 |
| Seongnam-si Pyongyang | Pyongyang Time | 00:00 |
| Seongnam-si Casablanca | Western European Time | 08:00 |
| Seongnam-si Zibo | China Time | 01:00 |
| Seongnam-si Zhongshan | China Time | 03:00 |
| Seongnam-si Durban | South Africa Standard Time | 07:00 |
| Seongnam-si Changsha | China Time | 01:00 |
| Seongnam-si Kabul | Afghanistan Time | 04:30 |
| Seongnam-si Ürümqi | China Time | 03:00 |
| Seongnam-si Caracas | Venezuela Time | 13:00 |
| Seongnam-si Pune | India Standard Time | 03:30 |
| Seongnam-si Surat | India Standard Time | 03:30 |
| Seongnam-si Jeddah | Arabian Time | 06:00 |
| Seongnam-si Shijiazhuang | China Time | 01:00 |
| Seongnam-si Kanpur | India Standard Time | 03:30 |
| Seongnam-si Kiev | Eastern European Time | 07:00 |