| Solothurn to Nasaud | 789.84 mi (1,271.12 km) |
| Solothurn to Navodari | 1,032.14 mi (1,661.08 km) |
| Solothurn to Negresti-Oas | 741.22 mi (1,192.87 km) |
| Solothurn to Nehoiu | 903.27 mi (1,453.68 km) |
| Solothurn to Ocna Mures | 772.86 mi (1,243.79 km) |
| Solothurn to Odobesti | 932.08 mi (1,500.03 km) |
| Solothurn to Odorheiu Secuiesc | 841.43 mi (1,354.14 km) |
| Solothurn to Oltenita | 945.05 mi (1,520.91 km) |
| Solothurn to Onesti | 910.95 mi (1,466.03 km) |
| Solothurn to Oradea | 675.26 mi (1,086.72 km) |
| Solothurn to Orastie | 749.33 mi (1,205.94 km) |
| Solothurn to Oravita | 693.10 mi (1,115.44 km) |
| Solothurn to Orsova | 732.96 mi (1,179.58 km) |
| Solothurn to Otelu Rosu | 715.08 mi (1,150.82 km) |
| Solothurn to Otopeni | 908.10 mi (1,461.45 km) |
