| Ontario to Roy (Utah) | 578.82 mi (931.51 km) |
| Ontario to Royal Kunia (Hawaii) | 2,602.42 mi (4,188.19 km) |
| Ontario to Royal Oak (Michigan) | 1,943.03 mi (3,127.01 km) |
| Ontario to Royal Palm Beach (Florida) | 2,272.11 mi (3,656.60 km) |
| Ontario to Royse City (Texas) | 1,226.46 mi (1,973.80 km) |
| Ontario to Ruskin (Florida) | 2,121.14 mi (3,413.65 km) |
| Ontario to Russellville (Alabama) | 1,699.99 mi (2,735.88 km) |
| Ontario to Russellville (Arkansas) | 1,389.72 mi (2,236.54 km) |
| Ontario to Ruston (Louisiana) | 1,442.40 mi (2,321.33 km) |
| Ontario to Rutherford (New Jersey) | 2,406.99 mi (3,873.67 km) |
| Ontario to Rutland (Vermont) | 2,459.77 mi (3,958.62 km) |
| Ontario to Sabana Grande (Puerto Rico) | 3,294.23 mi (5,301.56 km) |
| Ontario to Sachse (Texas) | 1,211.53 mi (1,949.76 km) |
| Ontario to Saco (Maine) | 2,585.76 mi (4,161.37 km) |
| Ontario to Sacramento (California) | 379.57 mi (610.86 km) |
