| Ontario to Petersburg (Virginia) | 2,252.35 mi (3,624.80 km) |
| Ontario to Pflugerville (Texas) | 1,192.93 mi (1,919.83 km) |
| Ontario to Pharr (Texas) | 1,278.72 mi (2,057.90 km) |
| Ontario to Phelan (California) | 28.06 mi (45.16 km) |
| Ontario to Phenix City (Alabama) | 1,877.87 mi (3,022.14 km) |
| Ontario to Philadelphia (Pennsylvania) | 2,356.29 mi (3,792.08 km) |
| Ontario to Phillipsburg (New Jersey) | 2,351.17 mi (3,783.84 km) |
| Ontario to Phoenix (Arizona) | 318.35 mi (512.34 km) |
| Ontario to Phoenixville (Pennsylvania) | 2,335.37 mi (3,758.41 km) |
| Ontario to Picayune (Mississippi) | 1,644.36 mi (2,646.34 km) |
| Ontario to Pickerington (Ohio) | 1,952.38 mi (3,142.05 km) |
| Ontario to Pico Rivera (California) | 27.84 mi (44.80 km) |
| Ontario to Piedmont (California) | 367.65 mi (591.68 km) |
| Ontario to Pierre (South Dakota) | 1,164.84 mi (1,874.62 km) |
| Ontario to Pike Creek Valley (Delaware) | 2,327.63 mi (3,745.96 km) |
