| Houston to Quarteira | 4,877.69 mi (7,849.88 km) |
| Houston to Queluz | 4,774.43 mi (7,683.70 km) |
| Houston to Reguengos de Monsaraz | 4,869.74 mi (7,837.09 km) |
| Houston to Resende | 4,777.54 mi (7,688.71 km) |
| Houston to Ribeira Brava | 4,520.36 mi (7,274.82 km) |
| Houston to Ribeira Grande | 3,957.75 mi (6,369.38 km) |
| Houston to Rio de Mouro | 4,770.66 mi (7,677.64 km) |
| Houston to Rio Maior | 4,775.92 mi (7,686.09 km) |
| Houston to Rio Tinto | 4,746.89 mi (7,639.39 km) |
| Houston to Sabugal | 4,840.02 mi (7,789.25 km) |
| Houston to Sacavem | 4,781.35 mi (7,694.84 km) |
| Houston to Salvaterra de Magos | 4,791.59 mi (7,711.32 km) |
| Houston to Santa Comba Dao | 4,788.40 mi (7,706.18 km) |
| Houston to Santa Cruz | 4,533.95 mi (7,296.68 km) |
| Houston to Santa Iria da Azoia | 4,780.86 mi (7,694.05 km) |
