| Jeju-si Siping | China Time | 01:00 |
| Jeju-si Kagoshima | Japan Time | 00:00 |
| Jeju-si Surakarta | Western Indonesia Time | 02:00 |
| Jeju-si Huai'an | China Time | 01:00 |
| Jeju-si Bhavnagar | India Standard Time | 03:30 |
| Jeju-si Mar del Plata | Argentina Time | 12:00 |
| Jeju-si Bahawalpur | Pakistan Time | 04:00 |
| Jeju-si Zāhedān | Iran Time | 05:30 |
| Jeju-si Aden | Arabian Time | 06:00 |
| Jeju-si Nanded | India Standard Time | 03:30 |
| Jeju-si Orenburg | Yekaterinburg Time | 04:00 |
| Jeju-si Changwon | Korean Time | 00:00 |
| Jeju-si Pristina | Central European Time | 08:00 |
| Jeju-si Jiamusi | China Time | 01:00 |
| Jeju-si Antipolo | Philippine Time | 01:00 |
| Jeju-si Neijiang | China Time | 01:00 |
| Jeju-si Bremen | Central European Time | 08:00 |
| Jeju-si Meknes | Western European Time | 08:00 |
| Jeju-si Sharjah | Gulf Standard Time | 05:00 |
| Jeju-si Banciao | Taipei Time | 01:00 |
| Jeju-si Sargodha | Pakistan Time | 04:00 |
| Jeju-si Bangui | West Africa Time | 08:00 |
| Jeju-si Vilnius | Eastern European Time | 07:00 |
| Jeju-si Cancún | Eastern Time | 14:00 |
| Jeju-si Yangzhou | China Time | 01:00 |
| Jeju-si Novokuznetsk | Novokuznetsk Time | 02:00 |
| Jeju-si Kisangani | Central Africa Time | 07:00 |
| Jeju-si Port Said | Eastern European Time | 07:00 |
| Jeju-si Mersin | Turkey Time | 06:00 |
| Jeju-si Warri | West Africa Time | 08:00 |
| Jeju-si Guli | China Time | 01:00 |
| Jeju-si Ebute Ikorodu | West Africa Time | 08:00 |
| Jeju-si Taku | China Time | 01:00 |
| Jeju-si Jiangmen | China Time | 01:00 |
| Jeju-si Tucson | Mountain Time | 16:00 |
| Jeju-si Nashville | Central Time | 15:00 |
| Jeju-si Taif | Arabian Time | 06:00 |
| Jeju-si Beira | Central Africa Time | 07:00 |
| Jeju-si Guntur | India Standard Time | 03:30 |
| Jeju-si Touba | Greenwich Mean Time | 09:00 |
| Jeju-si Quebec City | Eastern Time | 14:00 |
| Jeju-si Hamedan | Iran Time | 05:30 |
| Jeju-si Cangzhou | China Time | 01:00 |
| Jeju-si San Salvador | Central Time | 15:00 |
| Jeju-si Santa María Chimalhuacán | Central Time | 15:00 |
| Jeju-si Torreón | Central Time | 15:00 |
| Jeju-si Dehradun | India Standard Time | 03:30 |
| Jeju-si Cuiabá | Amazon Time | 13:00 |
| Jeju-si Cuauhtémoc | Central Time | 15:00 |
| Jeju-si Ciudad López Mateos | Central Time | 15:00 |