| Aachen to Oestrich-Winkel | 99.99 mi (160.92 km) |
| Aachen to Offenburg | 179.72 mi (289.23 km) |
| Aachen to Oftersheim | 147.38 mi (237.18 km) |
| Aachen to Ohrdruf | 203.02 mi (326.72 km) |
| Aachen to Ohringen | 186.74 mi (300.54 km) |
| Aachen to Olbernhau | 317.08 mi (510.30 km) |
| Aachen to Olching | 294.56 mi (474.06 km) |
| Aachen to Oldenburg | 187.07 mi (301.06 km) |
| Aachen to Oldenburg in Holstein | 316.06 mi (508.64 km) |
| Aachen to Olfen | 85.95 mi (138.32 km) |
| Aachen to Olpe | 78.05 mi (125.60 km) |
| Aachen to Olsberg | 111.50 mi (179.44 km) |
| Aachen to Oranienburg | 334.85 mi (538.90 km) |
| Aachen to Ortenberg | 133.60 mi (215.00 km) |
| Aachen to Oschatz | 307.17 mi (494.35 km) |
