| Port Glasgow to Nyon | 810.06 mi (1,303.66 km) |
| Port Glasgow to Oberriet | 850.43 mi (1,368.63 km) |
| Port Glasgow to Obersiggenthal | 803.43 mi (1,293.00 km) |
| Port Glasgow to Oberwil | 780.80 mi (1,256.57 km) |
| Port Glasgow to Oberwingert | 815.86 mi (1,313.00 km) |
| Port Glasgow to Oftringen | 801.88 mi (1,290.50 km) |
| Port Glasgow to Olten | 799.58 mi (1,286.80 km) |
| Port Glasgow to Onex | 818.60 mi (1,317.41 km) |
| Port Glasgow to Opfikon | 814.36 mi (1,310.58 km) |
| Port Glasgow to Ostermundigen | 810.03 mi (1,303.61 km) |
| Port Glasgow to Payerne | 802.88 mi (1,292.10 km) |
| Port Glasgow to Pfaffikon | 824.31 mi (1,326.60 km) |
| Port Glasgow to Plan-les-Ouates | 820.00 mi (1,319.66 km) |
| Port Glasgow to Pratteln | 784.75 mi (1,262.93 km) |
| Port Glasgow to Prilly | 810.54 mi (1,304.44 km) |
