| SeaTac to Oerlinghausen | 4,983.02 mi (8,019.39 km) |
| SeaTac to Oestrich-Winkel | 5,082.05 mi (8,178.78 km) |
| SeaTac to Offenburg | 5,169.85 mi (8,320.07 km) |
| SeaTac to Oftersheim | 5,132.78 mi (8,260.41 km) |
| SeaTac to Ohrdruf | 5,096.75 mi (8,202.43 km) |
| SeaTac to Ohringen | 5,164.53 mi (8,311.51 km) |
| SeaTac to Olbernhau | 5,163.53 mi (8,309.91 km) |
| SeaTac to Olching | 5,266.35 mi (8,475.37 km) |
| SeaTac to Oldenburg | 4,904.29 mi (7,892.70 km) |
| SeaTac to Oldenburg in Holstein | 4,894.89 mi (7,877.56 km) |
| SeaTac to Olfen | 4,967.83 mi (7,994.95 km) |
| SeaTac to Olpe | 5,018.97 mi (8,077.24 km) |
| SeaTac to Olsberg | 5,014.75 mi (8,070.46 km) |
| SeaTac to Oranienburg | 5,035.99 mi (8,104.65 km) |
| SeaTac to Ortenberg | 5,086.17 mi (8,185.41 km) |
