| Ottawa to Nymburk | 4,622.38 mi (7,439.00 km) |
| Ottawa to Olomouc | 4,724.88 mi (7,603.95 km) |
| Ottawa to Opava | 4,732.41 mi (7,616.07 km) |
| Ottawa to Orlova | 4,754.54 mi (7,651.69 km) |
| Ottawa to Ostrava | 4,750.24 mi (7,644.77 km) |
| Ottawa to Ostrov | 4,543.16 mi (7,311.51 km) |
| Ottawa to Otrokovice | 4,751.41 mi (7,646.66 km) |
| Ottawa to Pardubice | 4,654.44 mi (7,490.59 km) |
| Ottawa to Pelhrimov | 4,660.73 mi (7,500.72 km) |
| Ottawa to Pisek | 4,627.58 mi (7,447.38 km) |
| Ottawa to Plzen | 4,581.77 mi (7,373.64 km) |
| Ottawa to Podebrady | 4,626.93 mi (7,446.32 km) |
| Ottawa to Policka | 4,685.30 mi (7,540.26 km) |
| Ottawa to Prachatice | 4,634.61 mi (7,458.68 km) |
| Ottawa to Prague | 4,604.71 mi (7,410.56 km) |
