| Llantwit Major to Blue Springs (Missouri) | 4,212.66 mi (6,779.63 km) |
| Llantwit Major to Bluffdale (Utah) | 4,772.99 mi (7,681.39 km) |
| Llantwit Major to Bluffton (Indiana) | 3,777.00 mi (6,078.50 km) |
| Llantwit Major to Bluffton (South Carolina) | 4,001.12 mi (6,439.18 km) |
| Llantwit Major to Blythe (California) | 5,236.89 mi (8,427.97 km) |
| Llantwit Major to Blytheville (Arkansas) | 4,190.68 mi (6,744.24 km) |
| Llantwit Major to Boca Raton (Florida) | 4,252.56 mi (6,843.84 km) |
| Llantwit Major to Boerne (Texas) | 4,850.64 mi (7,806.34 km) |
| Llantwit Major to Bogalusa (Louisiana) | 4,442.32 mi (7,149.22 km) |
| Llantwit Major to Boiling Springs (South Carolina) | 3,910.14 mi (6,292.76 km) |
| Llantwit Major to Boise (Idaho) | 4,742.37 mi (7,632.11 km) |
| Llantwit Major to Bolingbrook (Illinois) | 3,848.84 mi (6,194.12 km) |
| Llantwit Major to Bolivar (Missouri) | 4,247.96 mi (6,836.44 km) |
| Llantwit Major to Bon Air (Virginia) | 3,613.32 mi (5,815.07 km) |
| Llantwit Major to Bonham (Texas) | 4,555.67 mi (7,331.64 km) |
