| Seongnam-si Jaboatão dos Guararapes | Brasilia Time | 12:00 |
| Seongnam-si Shaoguan | China Time | 01:00 |
| Seongnam-si Yancheng | China Time | 01:00 |
| Seongnam-si Coyoacán | Central Time | 15:00 |
| Seongnam-si Contagem | Brasilia Time | 12:00 |
| Seongnam-si Santiago de Querétaro | Central Time | 15:00 |
| Seongnam-si Bhilai | India Standard Time | 03:30 |
| Seongnam-si Panshan | China Time | 01:00 |
| Seongnam-si Djibouti | East Africa Time | 06:00 |
| Seongnam-si Las Vegas | Pacific Time | 17:00 |
| Seongnam-si Baltimore | Eastern Time | 14:00 |
| Seongnam-si Saltillo | Central Time | 15:00 |
| Seongnam-si Kermanshah | Iran Time | 05:30 |
| Seongnam-si Ribeirão Preto | Brasilia Time | 12:00 |
| Seongnam-si Al Hudaydah | Arabian Time | 06:00 |
| Seongnam-si Pasig | Philippine Time | 01:00 |
| Seongnam-si Bristol | United Kingdom Time | 09:00 |
| Seongnam-si Jamshedpur | India Standard Time | 03:30 |
| Seongnam-si Haikou | China Time | 01:00 |
| Seongnam-si Ta‘izz | Arabian Time | 06:00 |
| Seongnam-si São José dos Campos | Brasilia Time | 12:00 |
| Seongnam-si Taizhou | China Time | 01:00 |
| Seongnam-si Xingtai | China Time | 01:00 |
| Seongnam-si Borivali | India Standard Time | 03:30 |
| Seongnam-si Tlalpan | Central Time | 15:00 |
| Seongnam-si Yaroslavl | Moscow Time | 06:00 |
| Seongnam-si Benoni | South Africa Standard Time | 07:00 |
| Seongnam-si Hamamatsu | Japan Time | 00:00 |
| Seongnam-si Kochi | India Standard Time | 03:30 |
| Seongnam-si Jinzhou | China Time | 01:00 |
| Seongnam-si Amravati | India Standard Time | 03:30 |
| Seongnam-si Abu Dhabi | Gulf Standard Time | 05:00 |
| Seongnam-si Hai Phong | Indochina Time | 02:00 |
| Seongnam-si Islamabad | Pakistan Time | 04:00 |
| Seongnam-si Kirkuk | Arabian Time | 06:00 |
| Seongnam-si Sangli | India Standard Time | 03:30 |
| Seongnam-si Milwaukee | Central Time | 15:00 |
| Seongnam-si Shuangyashan | China Time | 01:00 |
| Seongnam-si Situbondo | Western Indonesia Time | 02:00 |
| Seongnam-si Scarborough | Eastern Time | 14:00 |
| Seongnam-si Vancouver | Pacific Time | 17:00 |
| Seongnam-si Barnaul | Barnaul Time | 02:00 |
| Seongnam-si Rotterdam | Central European Time | 08:00 |
| Seongnam-si Luancheng | China Time | 01:00 |
| Seongnam-si Mexicali | Pacific Time | 17:00 |
| Seongnam-si Hermosillo | Mexican Pacific Time | 16:00 |
| Seongnam-si Rasht | Iran Time | 05:30 |
| Seongnam-si Abeokuta | West Africa Time | 08:00 |
| Seongnam-si Essen | Central European Time | 08:00 |
| Seongnam-si Kayseri | Turkey Time | 06:00 |