| Sintra to Ridgeland (Mississippi) | 4,407.75 mi (7,093.59 km) |
| Sintra to Ridgewood (New Jersey) | 3,353.56 mi (5,397.04 km) |
| Sintra to Rifle (Colorado) | 4,965.53 mi (7,991.24 km) |
| Sintra to Rincon (Georgia) | 3,960.07 mi (6,373.12 km) |
| Sintra to Ringwood (New Jersey) | 3,358.59 mi (5,405.14 km) |
| Sintra to Río Grande (Puerto Rico) | 3,639.63 mi (5,857.43 km) |
| Sintra to Rio Grande City (Texas) | 5,072.95 mi (8,164.13 km) |
| Sintra to Rio Linda (California) | 5,569.20 mi (8,962.77 km) |
| Sintra to Rio Rancho (New Mexico) | 5,090.69 mi (8,192.68 km) |
| Sintra to Rio Rico (Arizona) | 5,446.59 mi (8,765.44 km) |
| Sintra to Ripon (California) | 5,601.34 mi (9,014.49 km) |
| Sintra to River Edge (New Jersey) | 3,351.23 mi (5,393.28 km) |
| Sintra to River Falls (Wisconsin) | 4,113.29 mi (6,619.70 km) |
| Sintra to River Forest (Illinois) | 3,984.78 mi (6,412.88 km) |
| Sintra to River Grove (Illinois) | 3,984.77 mi (6,412.86 km) |
