U.S. National Gasoline Average Reaches $4 a Gallon on Monday

The U.S. national average price for a gallon of regular gasoline reached $4.00 on Monday, July 20, 2026. The American Automobile Association reported the figure, the second time the benchmark has been crossed since fighting with Iran disrupted oil flows through the Strait of Hormuz earlier this year.

Prices first crossed $4 on March 31, climbed to a four-year high of $4.56 in early May, then fell below $4 after the United States and Iran signed a memorandum of understanding on June 14. The average has increased about 13 cents over the past week. It stood at $2.98 before the conflict began and $3.14 a year earlier.

Brent crude rose 3.2 percent to $90.95 a barrel on Monday while benchmark U.S. crude climbed 2.8 percent to $84.04 a barrel. Iran resumed attacks on vessels leaving the strait after the June agreement.

The United States responded with a blockade on Iranian ports. State-level prices varied sharply, with Indiana at the lowest average of $3.35 a gallon and California at the highest of $5.49. Washington state and Hawaii both exceeded $5.