| SeaTac to Oberkirch | 5,169.63 mi (8,319.72 km) |
| SeaTac to Obernburg am Main | 5,118.45 mi (8,237.35 km) |
| SeaTac to Obernkirchen | 4,975.76 mi (8,007.71 km) |
| SeaTac to Oberschleissheim | 5,269.15 mi (8,479.88 km) |
| SeaTac to Oberstdorf | 5,288.92 mi (8,511.69 km) |
| SeaTac to Obertraubling | 5,240.03 mi (8,433.01 km) |
| SeaTac to Obertshausen | 5,097.91 mi (8,204.30 km) |
| SeaTac to Oberursel | 5,083.88 mi (8,181.72 km) |
| SeaTac to Ochsenfurt | 5,151.24 mi (8,290.12 km) |
| SeaTac to Ochsenhausen | 5,241.75 mi (8,435.77 km) |
| SeaTac to Ochtrup | 4,935.09 mi (7,942.26 km) |
| SeaTac to Odenthal | 5,001.03 mi (8,048.38 km) |
| SeaTac to Oelde | 4,978.91 mi (8,012.79 km) |
| SeaTac to Oelsnitz | 5,153.16 mi (8,293.21 km) |
| SeaTac to Oer-Erkenschwick | 4,969.03 mi (7,996.87 km) |
