| Barrhead to Opole | 983.62 mi (1,582.98 km) |
| Barrhead to Orzesze | 1,032.71 mi (1,661.99 km) |
| Barrhead to Osowa | 904.16 mi (1,455.10 km) |
| Barrhead to Ostroda | 976.78 mi (1,571.98 km) |
| Barrhead to Ostroleka | 1,053.56 mi (1,695.54 km) |
| Barrhead to Ostrow Mazowiecka | 1,073.16 mi (1,727.08 km) |
| Barrhead to Ostrow Wielkopolski | 947.21 mi (1,524.39 km) |
| Barrhead to Ostrowiec Swietokrzyski | 1,107.63 mi (1,782.56 km) |
| Barrhead to Ostrzeszow | 958.93 mi (1,543.25 km) |
| Barrhead to Oswiecim | 1,054.59 mi (1,697.20 km) |
| Barrhead to Otwock | 1,066.85 mi (1,716.93 km) |
| Barrhead to Ozarow Mazowiecki | 1,045.96 mi (1,683.32 km) |
| Barrhead to Ozimek | 994.05 mi (1,599.76 km) |
| Barrhead to Ozorkow | 994.31 mi (1,600.19 km) |
| Barrhead to Pabianice | 1,007.53 mi (1,621.47 km) |
