| Solothurn to Cernavoda | 1,004.62 mi (1,616.78 km) |
| Solothurn to Chitila | 904.89 mi (1,456.28 km) |
| Solothurn to Cisnadie | 796.10 mi (1,281.20 km) |
| Solothurn to Cluj-Napoca | 755.72 mi (1,216.22 km) |
| Solothurn to Codlea | 857.04 mi (1,379.26 km) |
| Solothurn to Comanesti | 893.78 mi (1,438.41 km) |
| Solothurn to Comarnic | 873.70 mi (1,406.09 km) |
| Solothurn to Constanta | 1,036.53 mi (1,668.14 km) |
| Solothurn to Corabia | 853.67 mi (1,373.85 km) |
| Solothurn to Costesti | 849.91 mi (1,367.80 km) |
| Solothurn to Covasna | 889.43 mi (1,431.41 km) |
| Solothurn to Craiova | 807.96 mi (1,300.28 km) |
| Solothurn to Cristuru Secuiesc | 829.22 mi (1,334.50 km) |
| Solothurn to Cugir | 757.11 mi (1,218.45 km) |
| Solothurn to Cumpana | 1,034.13 mi (1,664.28 km) |
