| Ontario to Abilene (Texas) | 1,036.94 mi (1,668.79 km) |
| Ontario to Accokeek (Maryland) | 2,263.36 mi (3,642.53 km) |
| Ontario to Acworth (Georgia) | 1,877.16 mi (3,020.99 km) |
| Ontario to Ada (Oklahoma) | 1,192.55 mi (1,919.22 km) |
| Ontario to Addison (Illinois) | 1,691.59 mi (2,722.35 km) |
| Ontario to Addison (Texas) | 1,197.02 mi (1,926.42 km) |
| Ontario to Adelanto (California) | 38.64 mi (62.19 km) |
| Ontario to Adelphi (Maryland) | 2,263.63 mi (3,642.96 km) |
| Ontario to Adrian (Michigan) | 1,893.45 mi (3,047.21 km) |
| Ontario to Affton (Missouri) | 1,544.80 mi (2,486.12 km) |
| Ontario to Agoura Hills (California) | 66.51 mi (107.03 km) |
| Ontario to Aguadilla (Puerto Rico) | 3,271.27 mi (5,264.60 km) |
| Ontario to Aiken (South Carolina) | 2,050.00 mi (3,299.15 km) |
| Ontario to Akron (Ohio) | 2,019.95 mi (3,250.80 km) |
| Ontario to Alabaster (Alabama) | 1,765.20 mi (2,840.81 km) |
