| Flagstaff to Opwijk | 5,325.73 mi (8,570.93 km) |
| Flagstaff to Ostend | 5,272.41 mi (8,485.13 km) |
| Flagstaff to Oud-Heverlee | 5,347.66 mi (8,606.22 km) |
| Flagstaff to Oud-Turnhout | 5,335.88 mi (8,587.26 km) |
| Flagstaff to Oudenaarde | 5,311.76 mi (8,548.45 km) |
| Flagstaff to Oudenburg | 5,276.97 mi (8,492.47 km) |
| Flagstaff to Oupeye | 5,385.26 mi (8,666.74 km) |
| Flagstaff to Overijse | 5,345.56 mi (8,602.85 km) |
| Flagstaff to Overpelt | 5,354.47 mi (8,617.19 km) |
| Flagstaff to Paal | 5,354.74 mi (8,617.62 km) |
| Flagstaff to Peer | 5,359.53 mi (8,625.32 km) |
| Flagstaff to Pepinster | 5,397.47 mi (8,686.38 km) |
| Flagstaff to Peruwelz | 5,326.20 mi (8,571.69 km) |
| Flagstaff to Perwez | 5,362.08 mi (8,629.43 km) |
| Flagstaff to Philippeville | 5,372.71 mi (8,646.55 km) |
