| Hillegom to Navodari | 1,225.99 mi (1,973.05 km) |
| Hillegom to Negresti-Oas | 886.25 mi (1,426.28 km) |
| Hillegom to Nehoiu | 1,092.41 mi (1,758.06 km) |
| Hillegom to Ocna Mures | 954.75 mi (1,536.53 km) |
| Hillegom to Odobesti | 1,107.79 mi (1,782.81 km) |
| Hillegom to Odorheiu Secuiesc | 1,015.92 mi (1,634.97 km) |
| Hillegom to Oltenita | 1,156.45 mi (1,861.12 km) |
| Hillegom to Onesti | 1,077.87 mi (1,734.67 km) |
| Hillegom to Oradea | 851.88 mi (1,370.97 km) |
| Hillegom to Orastie | 948.95 mi (1,527.20 km) |
| Hillegom to Oravita | 923.62 mi (1,486.42 km) |
| Hillegom to Orsova | 964.36 mi (1,551.98 km) |
| Hillegom to Otelu Rosu | 929.05 mi (1,495.16 km) |
| Hillegom to Otopeni | 1,114.86 mi (1,794.19 km) |
| Hillegom to Ovidiu | 1,225.88 mi (1,972.86 km) |
