| Knoxville to Cortona | 4,837.97 mi (7,785.97 km) |
| Knoxville to Cosenza | 5,172.59 mi (8,324.48 km) |
| Knoxville to Cossato | 4,595.85 mi (7,396.31 km) |
| Knoxville to Costa Volpino | 4,668.96 mi (7,513.96 km) |
| Knoxville to Creazzo | 4,737.19 mi (7,623.78 km) |
| Knoxville to Crema | 4,666.98 mi (7,510.79 km) |
| Knoxville to Cremona | 4,689.71 mi (7,547.37 km) |
| Knoxville to Crevalcore | 4,751.43 mi (7,646.68 km) |
| Knoxville to Crispiano | 5,164.63 mi (8,311.67 km) |
| Knoxville to Crosia | 5,184.88 mi (8,344.26 km) |
| Knoxville to Crotone | 5,219.29 mi (8,399.63 km) |
| Knoxville to Cuneo | 4,607.91 mi (7,415.71 km) |
| Knoxville to Cuorgne | 4,579.49 mi (7,369.98 km) |
| Knoxville to Cusano Milanino | 4,639.65 mi (7,466.79 km) |
| Knoxville to Cutro | 5,215.37 mi (8,393.33 km) |
