| Helensburgh to Orthez | 883.15 mi (1,421.30 km) |
| Helensburgh to Orvault | 618.60 mi (995.53 km) |
| Helensburgh to Osny | 558.55 mi (898.89 km) |
| Helensburgh to Ostwald | 734.72 mi (1,182.42 km) |
| Helensburgh to Ouistreham | 501.63 mi (807.29 km) |
| Helensburgh to Oullins | 822.75 mi (1,324.09 km) |
| Helensburgh to Outreau | 449.94 mi (724.11 km) |
| Helensburgh to Oyonnax | 809.05 mi (1,302.04 km) |
| Helensburgh to Ozoir-la-Ferriere | 589.02 mi (947.94 km) |
| Helensburgh to Pace | 557.88 mi (897.82 km) |
| Helensburgh to Palaiseau | 583.49 mi (939.04 km) |
| Helensburgh to Pamiers | 934.59 mi (1,504.08 km) |
| Helensburgh to Panazol | 750.15 mi (1,207.24 km) |
| Helensburgh to Pantin | 575.74 mi (926.56 km) |
| Helensburgh to Paray-le-Monial | 762.48 mi (1,227.10 km) |
