| Didcot to Caño Martin Peña (Puerto Rico) | 4,152.10 mi (6,682.17 km) |
| Didcot to Cañon City (Colorado) | 4,718.92 mi (7,594.37 km) |
| Didcot to Canóvanas (Puerto Rico) | 4,148.98 mi (6,677.14 km) |
| Didcot to Canton (Georgia) | 4,139.11 mi (6,661.25 km) |
| Didcot to Canton (Illinois) | 4,055.64 mi (6,526.92 km) |
| Didcot to Canton (Mississippi) | 4,444.36 mi (7,152.51 km) |
| Didcot to Canton (Ohio) | 3,706.39 mi (5,964.85 km) |
| Didcot to Canyon (Texas) | 4,780.99 mi (7,694.26 km) |
| Didcot to Canyon Lake (California) | 5,388.81 mi (8,672.46 km) |
| Didcot to Canyon Lake (Texas) | 4,909.71 mi (7,901.41 km) |
| Didcot to Cape Coral (Florida) | 4,411.87 mi (7,100.23 km) |
| Didcot to Cape Girardeau (Missouri) | 4,193.16 mi (6,748.23 km) |
| Didcot to Carbondale (Illinois) | 4,160.11 mi (6,695.05 km) |
| Didcot to Carlisle (Pennsylvania) | 3,566.24 mi (5,739.31 km) |
| Didcot to Carlsbad (California) | 5,421.53 mi (8,725.10 km) |
