| Giffnock to Oswego (Illinois) | 3,702.43 mi (5,958.48 km) |
| Giffnock to Oswego (New York) | 3,184.48 mi (5,124.92 km) |
| Giffnock to Otsego (Minnesota) | 3,709.22 mi (5,969.41 km) |
| Giffnock to Ottawa (Illinois) | 3,736.29 mi (6,012.98 km) |
| Giffnock to Ottawa (Kansas) | 4,106.18 mi (6,608.26 km) |
| Giffnock to Ottumwa (Iowa) | 3,880.93 mi (6,245.75 km) |
| Giffnock to Overland (Missouri) | 3,926.46 mi (6,319.03 km) |
| Giffnock to Overland Park (Kansas) | 4,070.83 mi (6,551.37 km) |
| Giffnock to Overlea (Maryland) | 3,379.23 mi (5,438.35 km) |
| Giffnock to Oviedo (Florida) | 4,106.57 mi (6,608.89 km) |
| Giffnock to Owasso (Oklahoma) | 4,248.23 mi (6,836.86 km) |
| Giffnock to Owatonna (Minnesota) | 3,754.35 mi (6,042.04 km) |
| Giffnock to Owensboro (Kentucky) | 3,855.88 mi (6,205.44 km) |
| Giffnock to Owings Mills (Maryland) | 3,387.31 mi (5,451.35 km) |
| Giffnock to Owosso (Michigan) | 3,488.22 mi (5,613.75 km) |
