Distance from San Antonio, TX to Duncan, OK is 403Miles or 649 Km. You can get this distance about 6 hours 13 mins. If you want to planning travel with plane for 353 Miles or 568 Km, You can get this distance about 1 hours 15 mins .
A car with an average MPG will needs 18.66 gallons of gas to get the route between these points.
The estimated cost of gas to get between San Antonio, TX and Duncan, OK is $42.36.
During the route, an average car will release 365.59 pounds of CO2 to the atmosphere. Your carbon footprint is 0.91 pounds of CO2 per mile.
* Average US MPG used for calculations is 21.6 MPG.
* Average US gas price used for calculation is 2.27 per gallon.