| Ontario to Kingsville (Texas) | 1,253.35 mi (2,017.06 km) |
| Ontario to Kinston (North Carolina) | 2,260.16 mi (3,637.38 km) |
| Ontario to Kirkland (Washington) | 973.31 mi (1,566.39 km) |
| Ontario to Kirksville (Missouri) | 1,437.64 mi (2,313.66 km) |
| Ontario to Kirkwood (Missouri) | 1,539.85 mi (2,478.15 km) |
| Ontario to Kiryas Joel (New York) | 2,402.12 mi (3,865.85 km) |
| Ontario to Kissimmee (Florida) | 2,164.33 mi (3,483.15 km) |
| Ontario to Klamath Falls (Oregon) | 608.71 mi (979.63 km) |
| Ontario to Knightdale (North Carolina) | 2,204.42 mi (3,547.67 km) |
| Ontario to Knik-Fairview (Alaska) | 2,362.67 mi (3,802.34 km) |
| Ontario to Knoxville (Tennessee) | 1,900.06 mi (3,057.84 km) |
| Ontario to Kokomo (Indiana) | 1,776.96 mi (2,859.74 km) |
| Ontario to Kuna (Idaho) | 656.08 mi (1,055.86 km) |
| Ontario to Kyle (Texas) | 1,186.61 mi (1,909.66 km) |
| Ontario to La Cañada Flintridge (California) | 35.95 mi (57.85 km) |
