| Arklow to Oria | 1,401.65 mi (2,255.74 km) |
| Arklow to Oristano | 1,130.41 mi (1,819.22 km) |
| Arklow to Orta Nova | 1,290.25 mi (2,076.46 km) |
| Arklow to Orte | 1,114.95 mi (1,794.34 km) |
| Arklow to Ortona | 1,192.73 mi (1,919.52 km) |
| Arklow to Orvieto | 1,092.38 mi (1,758.02 km) |
| Arklow to Orzinuovi | 886.42 mi (1,426.56 km) |
| Arklow to Osimo | 1,105.24 mi (1,778.71 km) |
| Arklow to Ospitaletto | 884.58 mi (1,423.60 km) |
| Arklow to Ostuni | 1,388.39 mi (2,234.39 km) |
| Arklow to Ottaviano | 1,269.95 mi (2,043.79 km) |
| Arklow to Ovada | 876.45 mi (1,410.51 km) |
| Arklow to Ozieri | 1,103.74 mi (1,776.30 km) |
| Arklow to Paceco | 1,359.90 mi (2,188.55 km) |
| Arklow to Pachino | 1,512.61 mi (2,434.32 km) |
