| Ontario to Smyrna (Delaware) | 2,334.60 mi (3,757.18 km) |
| Ontario to Smyrna (Georgia) | 1,888.13 mi (3,038.64 km) |
| Ontario to Smyrna (Tennessee) | 1,756.61 mi (2,826.98 km) |
| Ontario to Snellville (Georgia) | 1,917.21 mi (3,085.45 km) |
| Ontario to Snoqualmie (Washington) | 957.65 mi (1,541.19 km) |
| Ontario to Snyder (Texas) | 966.52 mi (1,555.47 km) |
| Ontario to Socastee (South Carolina) | 2,201.20 mi (3,542.50 km) |
| Ontario to Socorro (Texas) | 678.83 mi (1,092.48 km) |
| Ontario to Soddy-Daisy (Tennessee) | 1,837.19 mi (2,956.67 km) |
| Ontario to Solana Beach (California) | 74.95 mi (120.62 km) |
| Ontario to Soledad (California) | 268.36 mi (431.88 km) |
| Ontario to Solon (Ohio) | 2,025.08 mi (3,259.05 km) |
| Ontario to Somers Point (New Jersey) | 2,387.84 mi (3,842.86 km) |
| Ontario to Somerset (Kentucky) | 1,857.12 mi (2,988.74 km) |
| Ontario to Somerset (New Jersey) | 2,387.50 mi (3,842.31 km) |
