| Gunbarrel to Orbetello | 5,488.48 mi (8,832.85 km) |
| Gunbarrel to Oria | 5,811.07 mi (9,352.02 km) |
| Gunbarrel to Oristano | 5,516.65 mi (8,878.18 km) |
| Gunbarrel to Orta Nova | 5,701.99 mi (9,176.47 km) |
| Gunbarrel to Orte | 5,528.91 mi (8,897.93 km) |
| Gunbarrel to Ortona | 5,604.50 mi (9,019.57 km) |
| Gunbarrel to Orvieto | 5,506.33 mi (8,861.58 km) |
| Gunbarrel to Orzinuovi | 5,298.49 mi (8,527.10 km) |
| Gunbarrel to Osimo | 5,515.49 mi (8,876.33 km) |
| Gunbarrel to Ospitaletto | 5,295.78 mi (8,522.74 km) |
| Gunbarrel to Ostuni | 5,797.08 mi (9,329.50 km) |
| Gunbarrel to Ottaviano | 5,683.90 mi (9,147.35 km) |
| Gunbarrel to Ovada | 5,290.18 mi (8,513.73 km) |
| Gunbarrel to Ozieri | 5,499.07 mi (8,849.90 km) |
| Gunbarrel to Paceco | 5,760.11 mi (9,270.00 km) |
