| Ostrava Aarhus | Central European Time | 00:00 |
| Ostrava Aarppookkara | India Standard Time | -04:30 |
| Ostrava Abanilla | Central European Time | 00:00 |
| Ostrava Aberlady | United Kingdom Time | 01:00 |
| Ostrava Abisko | Central European Time | 00:00 |
| Ostrava Abingdon | Eastern Time | 06:00 |
| Ostrava Abington | Eastern Time | 06:00 |
| Ostrava Aberdeen | Central Time | 07:00 |
| Ostrava Abeibara | Greenwich Mean Time | 01:00 |
| Ostrava Abbotsford | Eastern Australia Time | -10:00 |
| Ostrava Ajijic | Central Time | 07:00 |
| Ostrava Akköy | Turkey Time | -02:00 |
| Ostrava Al Aaroui | Western European Time | 00:00 |
| Ostrava Akrotiri | Eastern European Time | -01:00 |
| Ostrava Aigle | Central European Time | 00:00 |
| Ostrava Aiea | Hawaii-Aleutian Time | 11:00 |
| Ostrava Agurain | Central European Time | 00:00 |
| Ostrava Aitkenvale | Eastern Australia Time | -09:00 |
| Ostrava Airport West | Eastern Australia Time | -10:00 |
| Ostrava Air Itam | Malaysia Time | -07:00 |
| Ostrava Ajanta | India Standard Time | -04:30 |
| Ostrava Alba Adriatica | Central European Time | 00:00 |
| Ostrava Alavandipuram | India Standard Time | -04:30 |
| Ostrava Alaró | Central European Time | 00:00 |
| Ostrava Alaska | Atlantic Time | 05:00 |
| Ostrava Alaska | Central Time | 07:00 |
| Ostrava Alaska | Eastern Time | 06:00 |
| Ostrava Alata | Central European Time | 00:00 |
| Ostrava Alappuzha | India Standard Time | -04:30 |
| Ostrava Alamarathupatti | India Standard Time | -04:30 |
| Ostrava Alagón | Central European Time | 00:00 |
| Ostrava Alachua | Eastern Time | 06:00 |
| Ostrava Al-Qayrawan | Central European Time | 00:00 |
| Ostrava Al Mudayq | Gulf Standard Time | -03:00 |
| Ostrava Al Jaradiyah | Arabian Time | -02:00 |
| Ostrava Al-Mamurah | Central European Time | 00:00 |
| Ostrava Al Jaghbub | Eastern European Time | -01:00 |
| Ostrava Al Hofuf | Arabian Time | -02:00 |