| Ontario to Reidsville (North Carolina) | 2,134.22 mi (3,434.70 km) |
| Ontario to Reisterstown (Maryland) | 2,269.59 mi (3,652.54 km) |
| Ontario to Rendon (Texas) | 1,178.67 mi (1,896.89 km) |
| Ontario to Reno (Nevada) | 400.39 mi (644.36 km) |
| Ontario to Renton (Washington) | 958.61 mi (1,542.73 km) |
| Ontario to Republic (Missouri) | 1,370.57 mi (2,205.72 km) |
| Ontario to Reston (Virginia) | 2,243.47 mi (3,610.51 km) |
| Ontario to Revere (Massachusetts) | 2,561.39 mi (4,122.15 km) |
| Ontario to Rexburg (Idaho) | 744.21 mi (1,197.70 km) |
| Ontario to Reynoldsburg (Ohio) | 1,951.05 mi (3,139.91 km) |
| Ontario to Rialto (California) | 13.55 mi (21.81 km) |
| Ontario to Richardson (Texas) | 1,204.10 mi (1,937.81 km) |
| Ontario to Richfield (Minnesota) | 1,489.56 mi (2,397.21 km) |
| Ontario to Richfield (Wisconsin) | 1,696.47 mi (2,730.20 km) |
| Ontario to Richland (Washington) | 850.54 mi (1,368.81 km) |
