| Welwyn Garden City to Cernavoda | 1,390.70 mi (2,238.12 km) |
| Welwyn Garden City to Chitila | 1,298.59 mi (2,089.88 km) |
| Welwyn Garden City to Cisnadie | 1,179.22 mi (1,897.76 km) |
| Welwyn Garden City to Cluj-Napoca | 1,120.82 mi (1,803.79 km) |
| Welwyn Garden City to Codlea | 1,234.07 mi (1,986.04 km) |
| Welwyn Garden City to Comanesti | 1,252.73 mi (2,016.07 km) |
| Welwyn Garden City to Comarnic | 1,257.44 mi (2,023.65 km) |
| Welwyn Garden City to Constanta | 1,422.16 mi (2,288.74 km) |
| Welwyn Garden City to Corabia | 1,265.35 mi (2,036.38 km) |
| Welwyn Garden City to Costesti | 1,246.76 mi (2,006.47 km) |
| Welwyn Garden City to Covasna | 1,260.24 mi (2,028.16 km) |
| Welwyn Garden City to Craiova | 1,215.42 mi (1,956.02 km) |
| Welwyn Garden City to Cristuru Secuiesc | 1,197.21 mi (1,926.72 km) |
| Welwyn Garden City to Cugir | 1,141.79 mi (1,837.53 km) |
| Welwyn Garden City to Cumpana | 1,420.88 mi (2,286.68 km) |
