| Flagstaff to Nuth | 5,383.39 mi (8,663.74 km) |
| Flagstaff to Oegstgeest | 5,279.80 mi (8,497.02 km) |
| Flagstaff to Oirschot | 5,337.69 mi (8,590.17 km) |
| Flagstaff to Oisterwijk | 5,330.65 mi (8,578.85 km) |
| Flagstaff to Oldebroek | 5,312.99 mi (8,550.43 km) |
| Flagstaff to Oldenzaal | 5,351.43 mi (8,612.29 km) |
| Flagstaff to Ommen | 5,326.04 mi (8,571.43 km) |
| Flagstaff to Oosterend | 5,292.62 mi (8,517.64 km) |
| Flagstaff to Oosterhout | 5,316.88 mi (8,556.69 km) |
| Flagstaff to Oosterwolde | 5,300.18 mi (8,529.82 km) |
| Flagstaff to Oostzaan | 5,281.71 mi (8,500.10 km) |
| Flagstaff to Opmeer | 5,271.68 mi (8,483.95 km) |
| Flagstaff to Oss | 5,332.36 mi (8,581.61 km) |
| Flagstaff to Oud-Beijerland | 5,294.27 mi (8,520.30 km) |
| Flagstaff to Oudenbosch | 5,308.59 mi (8,543.35 km) |
