| Ontario to Robertsville (New Jersey) | 2,399.08 mi (3,860.94 km) |
| Ontario to Robinson (Texas) | 1,201.82 mi (1,934.15 km) |
| Ontario to Robstown (Texas) | 1,255.48 mi (2,020.50 km) |
| Ontario to Rochester (Michigan) | 1,946.07 mi (3,131.90 km) |
| Ontario to Rochester (Minnesota) | 1,506.29 mi (2,424.14 km) |
| Ontario to Rochester (New Hampshire) | 2,560.33 mi (4,120.45 km) |
| Ontario to Rochester (New York) | 2,226.22 mi (3,582.75 km) |
| Ontario to Rochester Hills (Michigan) | 1,944.06 mi (3,128.67 km) |
| Ontario to Rock Hill (South Carolina) | 2,072.53 mi (3,335.42 km) |
| Ontario to Rock Island (Illinois) | 1,555.32 mi (2,503.04 km) |
| Ontario to Rock Springs (Wyoming) | 693.54 mi (1,116.15 km) |
| Ontario to Rockford (Illinois) | 1,642.17 mi (2,642.82 km) |
| Ontario to Rockledge (Florida) | 2,202.93 mi (3,545.28 km) |
| Ontario to Rocklin (California) | 386.63 mi (622.22 km) |
| Ontario to Rockport (Texas) | 1,281.91 mi (2,063.03 km) |
