| Milford Haven to Opole | 993.43 mi (1,598.76 km) |
| Milford Haven to Orzesze | 1,037.02 mi (1,668.92 km) |
| Milford Haven to Osowa | 989.07 mi (1,591.76 km) |
| Milford Haven to Ostroda | 1,050.35 mi (1,690.38 km) |
| Milford Haven to Ostroleka | 1,119.40 mi (1,801.49 km) |
| Milford Haven to Ostrow Mazowiecka | 1,135.27 mi (1,827.04 km) |
| Milford Haven to Ostrow Wielkopolski | 975.27 mi (1,569.55 km) |
| Milford Haven to Ostrowiec Swietokrzyski | 1,136.75 mi (1,829.42 km) |
| Milford Haven to Ostrzeszow | 982.95 mi (1,581.90 km) |
| Milford Haven to Oswiecim | 1,059.22 mi (1,704.64 km) |
| Milford Haven to Otwock | 1,115.46 mi (1,795.15 km) |
| Milford Haven to Ozarow Mazowiecki | 1,094.86 mi (1,762.00 km) |
| Milford Haven to Ozimek | 1,005.26 mi (1,617.81 km) |
| Milford Haven to Ozorkow | 1,033.76 mi (1,663.67 km) |
| Milford Haven to Pabianice | 1,041.50 mi (1,676.14 km) |
