| Helensburgh to Opole | 999.75 mi (1,608.95 km) |
| Helensburgh to Orzesze | 1,048.99 mi (1,688.18 km) |
| Helensburgh to Osowa | 916.65 mi (1,475.20 km) |
| Helensburgh to Ostroda | 989.77 mi (1,592.88 km) |
| Helensburgh to Ostroleka | 1,066.82 mi (1,716.89 km) |
| Helensburgh to Ostrow Mazowiecka | 1,086.59 mi (1,748.70 km) |
| Helensburgh to Ostrow Wielkopolski | 962.62 mi (1,549.18 km) |
| Helensburgh to Ostrowiec Swietokrzyski | 1,122.69 mi (1,806.79 km) |
| Helensburgh to Ostrzeszow | 974.50 mi (1,568.30 km) |
| Helensburgh to Oswiecim | 1,070.82 mi (1,723.32 km) |
| Helensburgh to Otwock | 1,081.01 mi (1,739.72 km) |
| Helensburgh to Ozarow Mazowiecki | 1,060.15 mi (1,706.15 km) |
| Helensburgh to Ozimek | 1,010.10 mi (1,625.60 km) |
| Helensburgh to Ozorkow | 1,009.08 mi (1,623.96 km) |
| Helensburgh to Pabianice | 1,022.54 mi (1,645.61 km) |
