| Flagstaff to Oswego (Illinois) | 1,332.59 mi (2,144.60 km) |
| Flagstaff to Oswego (New York) | 1,945.86 mi (3,131.56 km) |
| Flagstaff to Otsego (Minnesota) | 1,173.06 mi (1,887.86 km) |
| Flagstaff to Ottawa (Illinois) | 1,303.19 mi (2,097.28 km) |
| Flagstaff to Ottawa (Kansas) | 932.61 mi (1,500.89 km) |
| Flagstaff to Ottumwa (Iowa) | 1,116.07 mi (1,796.14 km) |
| Flagstaff to Overland (Missouri) | 1,195.41 mi (1,923.83 km) |
| Flagstaff to Overland Park (Kansas) | 966.61 mi (1,555.62 km) |
| Flagstaff to Overlea (Maryland) | 1,938.99 mi (3,120.50 km) |
| Flagstaff to Oviedo (Florida) | 1,832.95 mi (2,949.86 km) |
| Flagstaff to Owasso (Oklahoma) | 887.73 mi (1,428.66 km) |
| Flagstaff to Owatonna (Minnesota) | 1,151.72 mi (1,853.51 km) |
| Flagstaff to Owensboro (Kentucky) | 1,368.92 mi (2,203.07 km) |
| Flagstaff to Owings Mills (Maryland) | 1,924.24 mi (3,096.76 km) |
| Flagstaff to Owosso (Michigan) | 1,558.93 mi (2,508.86 km) |
