| Castalla to Nottingham | 992.21 mi (1,596.80 km) |
| Castalla to Nuneaton | 962.97 mi (1,549.75 km) |
| Castalla to Oadby | 967.64 mi (1,557.26 km) |
| Castalla to Oakengates | 977.81 mi (1,573.63 km) |
| Castalla to Oakham | 972.41 mi (1,564.94 km) |
| Castalla to Oldbury | 963.13 mi (1,550.00 km) |
| Castalla to Oldham | 1,035.05 mi (1,665.76 km) |
| Castalla to Ollerton | 1,009.13 mi (1,624.03 km) |
| Castalla to Olton | 957.87 mi (1,541.54 km) |
| Castalla to Omagh | 1,147.60 mi (1,846.89 km) |
| Castalla to Ormesby | 1,102.47 mi (1,774.25 km) |
| Castalla to Ormskirk | 1,039.62 mi (1,673.11 km) |
| Castalla to Orpington | 883.62 mi (1,422.05 km) |
| Castalla to Ossett | 1,043.04 mi (1,678.61 km) |
| Castalla to Oswaldtwistle | 1,049.67 mi (1,689.28 km) |
