Arizona gas prices are nearing a three-year high. Triple-A Arizona officials say the statewide average rose five cents this week to sit at nearly $2.70 a gallon. The last time Arizona was at $2.70 or above was in August of 2015. In Flagstaff, the average price of gas rose nearly five cents to $2.89 a gallon. However, some stations are selling gas for $2.69 and lower. In the Prescott area, gas was up four cents this week to $2.78 a gallon. However some stations are selling gas at $2.65 and lower. Last year in Flagstaff the average price was $2.48 a gallon while it was $2.37 a gallon in Prescott. Officials say prices are likely to continue to rise as we switch to summer blend gas.