| Sidney to Cortona | 4,659.28 mi (7,498.39 km) |
| Sidney to Cosenza | 5,000.38 mi (8,047.33 km) |
| Sidney to Cossato | 4,414.77 mi (7,104.89 km) |
| Sidney to Costa Volpino | 4,483.75 mi (7,215.90 km) |
| Sidney to Creazzo | 4,550.88 mi (7,323.93 km) |
| Sidney to Crema | 4,484.24 mi (7,216.69 km) |
| Sidney to Cremona | 4,507.30 mi (7,253.79 km) |
| Sidney to Crevalcore | 4,568.74 mi (7,352.68 km) |
| Sidney to Crispiano | 4,985.84 mi (8,023.94 km) |
| Sidney to Crosia | 5,010.67 mi (8,063.89 km) |
| Sidney to Crotone | 5,046.07 mi (8,120.87 km) |
| Sidney to Cuneo | 4,432.55 mi (7,133.50 km) |
| Sidney to Cuorgne | 4,399.94 mi (7,081.03 km) |
| Sidney to Cusano Milanino | 4,457.00 mi (7,172.85 km) |
| Sidney to Cutro | 5,042.61 mi (8,115.30 km) |
