| Houston to Rivalta di Torino | 5,362.69 mi (8,630.42 km) |
| Houston to Rivarolo Canavese | 5,360.80 mi (8,627.37 km) |
| Houston to Rivoli | 5,361.43 mi (8,628.39 km) |
| Houston to Rocca di Papa | 5,703.38 mi (9,178.71 km) |
| Houston to Rocca Priora | 5,704.89 mi (9,181.13 km) |
| Houston to Roccapiemonte | 5,827.31 mi (9,378.15 km) |
| Houston to Roccastrada | 5,590.27 mi (8,996.66 km) |
| Houston to Romano di Lombardia | 5,439.03 mi (8,753.28 km) |
| Houston to Rome | 5,688.52 mi (9,154.79 km) |
| Houston to Roncade | 5,542.61 mi (8,919.97 km) |
| Houston to Ronchi dei Legionari | 5,579.95 mi (8,980.06 km) |
| Houston to Ronciglione | 5,661.96 mi (9,112.05 km) |
| Houston to Rosa | 5,514.41 mi (8,874.59 km) |
| Houston to Rosarno | 5,974.35 mi (9,614.78 km) |
| Houston to Rosignano Marittimo | 5,545.99 mi (8,925.40 km) |
