| Cities | Distance |
|---|---|
| Holyhead to Opwijk | 407.04 mi (655.07 km) |
| Holyhead to Ostend | 350.05 mi (563.36 km) |
| Holyhead to Oud-Heverlee | 430.00 mi (692.01 km) |
| Holyhead to Oud-Turnhout | 428.49 mi (689.58 km) |
| Holyhead to Oudenaarde | 388.38 mi (625.04 km) |
| Holyhead to Oudenburg | 354.50 mi (570.51 km) |
| Holyhead to Oupeye | 472.00 mi (759.61 km) |
| Holyhead to Overijse | 426.41 mi (686.25 km) |
| Holyhead to Overpelt | 448.44 mi (721.69 km) |
| Holyhead to Paal | 443.66 mi (714.00 km) |
| Holyhead to Peer | 452.18 mi (727.71 km) |
| Holyhead to Pepinster | 483.19 mi (777.62 km) |
| Holyhead to Peruwelz | 399.47 mi (642.89 km) |
| Holyhead to Perwez | 442.47 mi (712.08 km) |
| Holyhead to Philippeville | 447.20 mi (719.69 km) |