| Cities | Distance |
|---|---|
| Monaghan to Opwijk | 519.25 mi (835.66 km) |
| Monaghan to Ostend | 462.90 mi (744.96 km) |
| Monaghan to Oud-Heverlee | 542.09 mi (872.41 km) |
| Monaghan to Oud-Turnhout | 538.21 mi (866.17 km) |
| Monaghan to Oudenaarde | 501.66 mi (807.34 km) |
| Monaghan to Oudenburg | 467.40 mi (752.20 km) |
| Monaghan to Oupeye | 583.37 mi (938.84 km) |
| Monaghan to Overijse | 538.83 mi (867.17 km) |
| Monaghan to Overpelt | 558.05 mi (898.10 km) |
| Monaghan to Paal | 554.35 mi (892.15 km) |
| Monaghan to Peer | 562.12 mi (904.64 km) |
| Monaghan to Pepinster | 594.84 mi (957.31 km) |
| Monaghan to Peruwelz | 513.62 mi (826.59 km) |
| Monaghan to Perwez | 555.07 mi (893.30 km) |
| Monaghan to Philippeville | 561.16 mi (903.09 km) |