| Castalla to Opole | 1,231.44 mi (1,981.81 km) |
| Castalla to Orzesze | 1,241.28 mi (1,997.64 km) |
| Castalla to Osowa | 1,413.44 mi (2,274.71 km) |
| Castalla to Ostroda | 1,426.62 mi (2,295.92 km) |
| Castalla to Ostroleka | 1,453.51 mi (2,339.20 km) |
| Castalla to Ostrow Mazowiecka | 1,454.73 mi (2,341.17 km) |
| Castalla to Ostrow Wielkopolski | 1,268.03 mi (2,040.70 km) |
| Castalla to Ostrowiec Swietokrzyski | 1,368.82 mi (2,202.90 km) |
| Castalla to Ostrzeszow | 1,262.18 mi (2,031.28 km) |
| Castalla to Oswiecim | 1,254.89 mi (2,019.55 km) |
| Castalla to Otwock | 1,406.59 mi (2,263.69 km) |
| Castalla to Ozarow Mazowiecki | 1,393.89 mi (2,243.25 km) |
| Castalla to Ozimek | 1,241.71 mi (1,998.34 km) |
| Castalla to Ozorkow | 1,331.25 mi (2,142.44 km) |
| Castalla to Pabianice | 1,321.98 mi (2,127.52 km) |
