| Aachen to Navodari | 1,135.65 mi (1,827.66 km) |
| Aachen to Negresti-Oas | 804.26 mi (1,294.33 km) |
| Aachen to Nehoiu | 1,002.05 mi (1,612.65 km) |
| Aachen to Ocna Mures | 864.56 mi (1,391.37 km) |
| Aachen to Odobesti | 1,020.95 mi (1,643.06 km) |
| Aachen to Odorheiu Secuiesc | 928.35 mi (1,494.04 km) |
| Aachen to Oltenita | 1,061.26 mi (1,707.94 km) |
| Aachen to Onesti | 992.96 mi (1,598.01 km) |
| Aachen to Oradea | 761.36 mi (1,225.29 km) |
| Aachen to Orastie | 854.43 mi (1,375.07 km) |
| Aachen to Oravita | 821.80 mi (1,322.55 km) |
| Aachen to Orsova | 862.80 mi (1,388.54 km) |
| Aachen to Otelu Rosu | 830.96 mi (1,337.29 km) |
| Aachen to Otopeni | 1,020.43 mi (1,642.22 km) |
| Aachen to Ovidiu | 1,135.23 mi (1,826.97 km) |
