| Kennewick to Popovo | 5,897.01 mi (9,490.31 km) |
| Kennewick to Provadia | 5,931.05 mi (9,545.11 km) |
| Kennewick to Radnevo | 5,957.62 mi (9,587.87 km) |
| Kennewick to Radomir | 5,879.24 mi (9,461.72 km) |
| Kennewick to Rakitovo | 5,939.14 mi (9,558.12 km) |
| Kennewick to Rakovski | 5,938.49 mi (9,557.08 km) |
| Kennewick to Razgrad | 5,890.95 mi (9,480.56 km) |
| Kennewick to Razlog | 5,932.16 mi (9,546.90 km) |
| Kennewick to Ruse | 5,861.45 mi (9,433.10 km) |
| Kennewick to Samokov | 5,905.63 mi (9,504.20 km) |
| Kennewick to Sandanski | 5,947.90 mi (9,572.22 km) |
| Kennewick to Sevlievo | 5,894.99 mi (9,487.07 km) |
| Kennewick to Shumen | 5,915.00 mi (9,519.27 km) |
| Kennewick to Silistra | 5,868.14 mi (9,443.86 km) |
| Kennewick to Sliven | 5,941.34 mi (9,561.66 km) |
