| Ontario to Arroyo Grande (California) | 185.24 mi (298.12 km) |
| Ontario to Artesia (California) | 29.65 mi (47.71 km) |
| Ontario to Artesia (New Mexico) | 763.73 mi (1,229.11 km) |
| Ontario to Artondale (Washington) | 953.05 mi (1,533.79 km) |
| Ontario to Arvada (Colorado) | 794.73 mi (1,279.00 km) |
| Ontario to Arvin (California) | 105.90 mi (170.43 km) |
| Ontario to Asbury Lake (Florida) | 2,105.26 mi (3,388.09 km) |
| Ontario to Asbury Park (New Jersey) | 2,414.45 mi (3,885.68 km) |
| Ontario to Ashburn (Virginia) | 2,236.38 mi (3,599.11 km) |
| Ontario to Asheboro (North Carolina) | 2,132.14 mi (3,431.35 km) |
| Ontario to Asheville (North Carolina) | 1,980.96 mi (3,188.05 km) |
| Ontario to Ashland (California) | 357.01 mi (574.56 km) |
| Ontario to Ashland (Kentucky) | 1,959.93 mi (3,154.20 km) |
| Ontario to Ashland (Ohio) | 1,978.01 mi (3,183.30 km) |
| Ontario to Ashland (Oregon) | 627.25 mi (1,009.46 km) |
