| Donegal to Orthez | 838.88 mi (1,350.05 km) |
| Donegal to Orvault | 582.41 mi (937.30 km) |
| Donegal to Osny | 580.25 mi (933.83 km) |
| Donegal to Ostwald | 796.63 mi (1,282.05 km) |
| Donegal to Ouistreham | 499.04 mi (803.12 km) |
| Donegal to Oullins | 838.90 mi (1,350.09 km) |
| Donegal to Outreau | 488.95 mi (786.89 km) |
| Donegal to Oyonnax | 835.93 mi (1,345.30 km) |
| Donegal to Ozoir-la-Ferriere | 613.76 mi (987.75 km) |
| Donegal to Pace | 525.52 mi (845.74 km) |
| Donegal to Palaiseau | 603.20 mi (970.76 km) |
| Donegal to Pamiers | 909.40 mi (1,463.54 km) |
| Donegal to Panazol | 736.30 mi (1,184.96 km) |
| Donegal to Pantin | 599.04 mi (964.07 km) |
| Donegal to Paray-le-Monial | 778.54 mi (1,252.94 km) |
