| Giffnock to Odessa (Texas) | 4,717.94 mi (7,592.80 km) |
| Giffnock to Ogden (Utah) | 4,516.44 mi (7,268.50 km) |
| Giffnock to Oildale (California) | 5,062.45 mi (8,147.23 km) |
| Giffnock to Ojus (Florida) | 4,211.94 mi (6,778.46 km) |
| Giffnock to Okemos (Michigan) | 3,510.81 mi (5,650.11 km) |
| Giffnock to Oklahoma City (Oklahoma) | 4,351.80 mi (7,003.54 km) |
| Giffnock to Okmulgee (Oklahoma) | 4,290.39 mi (6,904.72 km) |
| Giffnock to Olathe (Kansas) | 4,075.72 mi (6,559.24 km) |
| Giffnock to Old Jamestown (Missouri) | 3,916.10 mi (6,302.35 km) |
| Giffnock to Oldsmar (Florida) | 4,196.14 mi (6,753.04 km) |
| Giffnock to Olean (New York) | 3,320.65 mi (5,344.07 km) |
| Giffnock to Olive Branch (Mississippi) | 4,101.21 mi (6,600.25 km) |
| Giffnock to Olivehurst (California) | 4,922.30 mi (7,921.68 km) |
| Giffnock to Olney (Maryland) | 3,410.85 mi (5,489.23 km) |
| Giffnock to Olympia (Washington) | 4,493.79 mi (7,232.06 km) |
