| San Gregorio di Catania to Oberkirch | 835.93 mi (1,345.30 km) |
| San Gregorio di Catania to Obernburg am Main | 898.26 mi (1,445.61 km) |
| San Gregorio di Catania to Obernkirchen | 1,056.30 mi (1,699.95 km) |
| San Gregorio di Catania to Oberschleissheim | 759.47 mi (1,222.25 km) |
| San Gregorio di Catania to Oberstdorf | 723.00 mi (1,163.55 km) |
| San Gregorio di Catania to Obertraubling | 801.29 mi (1,289.56 km) |
| San Gregorio di Catania to Obertshausen | 917.90 mi (1,477.21 km) |
| San Gregorio di Catania to Oberursel | 930.96 mi (1,498.24 km) |
| San Gregorio di Catania to Ochsenfurt | 871.75 mi (1,402.94 km) |
| San Gregorio di Catania to Ochsenhausen | 771.22 mi (1,241.15 km) |
| San Gregorio di Catania to Ochtrup | 1,081.76 mi (1,740.92 km) |
| San Gregorio di Catania to Odenthal | 1,009.62 mi (1,624.82 km) |
| San Gregorio di Catania to Oelde | 1,042.24 mi (1,677.32 km) |
| San Gregorio di Catania to Oelsnitz | 899.69 mi (1,447.90 km) |
| San Gregorio di Catania to Oer-Erkenschwick | 1,045.20 mi (1,682.09 km) |
