| SeaTac to Opwijk | 4,933.28 mi (7,939.35 km) |
| SeaTac to Ostend | 4,886.91 mi (7,864.72 km) |
| SeaTac to Oud-Heverlee | 4,952.88 mi (7,970.89 km) |
| SeaTac to Oud-Turnhout | 4,933.22 mi (7,939.24 km) |
| SeaTac to Oudenaarde | 4,925.23 mi (7,926.39 km) |
| SeaTac to Oudenburg | 4,891.33 mi (7,871.83 km) |
| SeaTac to Oupeye | 4,984.10 mi (8,021.14 km) |
| SeaTac to Overijse | 4,952.40 mi (7,970.12 km) |
| SeaTac to Overpelt | 4,949.51 mi (7,965.47 km) |
| SeaTac to Paal | 4,953.67 mi (7,972.15 km) |
| SeaTac to Peer | 4,955.20 mi (7,974.63 km) |
| SeaTac to Pepinster | 4,996.47 mi (8,041.04 km) |
| SeaTac to Peruwelz | 4,943.60 mi (7,955.95 km) |
| SeaTac to Perwez | 4,968.46 mi (7,995.96 km) |
| SeaTac to Philippeville | 4,985.95 mi (8,024.11 km) |
