| SeaTac to Popovo | 5,876.76 mi (9,457.73 km) |
| SeaTac to Provadia | 5,908.58 mi (9,508.94 km) |
| SeaTac to Radnevo | 5,939.16 mi (9,558.15 km) |
| SeaTac to Radomir | 5,866.52 mi (9,441.25 km) |
| SeaTac to Rakitovo | 5,924.81 mi (9,535.06 km) |
| SeaTac to Rakovski | 5,922.01 mi (9,530.55 km) |
| SeaTac to Razgrad | 5,869.93 mi (9,446.74 km) |
| SeaTac to Razlog | 5,919.21 mi (9,526.04 km) |
| SeaTac to Ruse | 5,841.24 mi (9,400.56 km) |
| SeaTac to Samokov | 5,891.95 mi (9,482.18 km) |
| SeaTac to Sandanski | 5,935.69 mi (9,552.57 km) |
| SeaTac to Sevlievo | 5,877.36 mi (9,458.70 km) |
| SeaTac to Shumen | 5,893.42 mi (9,484.54 km) |
| SeaTac to Silistra | 5,845.01 mi (9,406.63 km) |
| SeaTac to Sliven | 5,921.63 mi (9,529.95 km) |
