| Sumner to Cernavoda | 5,857.15 mi (9,426.18 km) |
| Sumner to Chitila | 5,810.80 mi (9,351.58 km) |
| Sumner to Cisnadie | 5,700.49 mi (9,174.05 km) |
| Sumner to Cluj-Napoca | 5,622.83 mi (9,049.08 km) |
| Sumner to Codlea | 5,724.76 mi (9,213.10 km) |
| Sumner to Comanesti | 5,694.96 mi (9,165.15 km) |
| Sumner to Comarnic | 5,756.82 mi (9,264.70 km) |
| Sumner to Constanta | 5,878.26 mi (9,460.14 km) |
| Sumner to Corabia | 5,831.12 mi (9,384.27 km) |
| Sumner to Costesti | 5,780.61 mi (9,303.00 km) |
| Sumner to Covasna | 5,727.89 mi (9,218.15 km) |
| Sumner to Craiova | 5,782.43 mi (9,305.92 km) |
| Sumner to Cristuru Secuiesc | 5,679.32 mi (9,139.99 km) |
| Sumner to Cugir | 5,677.60 mi (9,137.21 km) |
| Sumner to Cumpana | 5,880.49 mi (9,463.74 km) |
