| Sigmaringen to Navodari | 960.42 mi (1,545.65 km) |
| Sigmaringen to Negresti-Oas | 656.38 mi (1,056.34 km) |
| Sigmaringen to Nehoiu | 829.31 mi (1,334.65 km) |
| Sigmaringen to Ocna Mures | 695.77 mi (1,119.73 km) |
| Sigmaringen to Odobesti | 855.36 mi (1,376.57 km) |
| Sigmaringen to Odorheiu Secuiesc | 763.53 mi (1,228.79 km) |
| Sigmaringen to Oltenita | 877.08 mi (1,411.53 km) |
| Sigmaringen to Onesti | 832.18 mi (1,339.27 km) |
| Sigmaringen to Oradea | 595.58 mi (958.50 km) |
| Sigmaringen to Orastie | 676.15 mi (1,088.16 km) |
| Sigmaringen to Oravita | 627.76 mi (1,010.27 km) |
| Sigmaringen to Orsova | 668.45 mi (1,075.76 km) |
| Sigmaringen to Otelu Rosu | 645.21 mi (1,038.37 km) |
| Sigmaringen to Otopeni | 838.57 mi (1,349.54 km) |
| Sigmaringen to Ovidiu | 959.35 mi (1,543.93 km) |
