The national average gasoline price slid 2 cents to $2.59 for the week ending Aug. 26 and is expected to be the cheapest Labor Day average in three years, according to AAA.

Today's average is 24 cents lower than a year ago and 4 cents cheaper than Labor Day in 2017.

"For Americans who bookend summer with road trips, they will find gas prices this coming weekend that are cheaper than this past Memorial Day and last year’s Labor Day holiday," said Jeanette Casselano, AAA spokesperson. "At the start of the week, two-thirds of all states have gas price averages that are nearly a quarter cheaper than last year."

States with the largest price decrease from a year ago include Idaho (43 cents), Louisiana (38 cents), Indiana (38 cents), Florida (36 cents), Kentucky (35 cents), Delaware (35 cents), Utah (35 cents), Mississippi (35 cents), Alaska (34 cents), and Oklahoma (34 cents).

States with the most expensive average gasoline price include Hawaii ($3.64), California ($3.57), Washington ($3.21), Nevada ($3.13), Oregon ($3.05), Alaska ($3.00), Utah ($2.85), Idaho ($2.82), Arizona ($2.81), and New York ($2.79).

Meanwhile, the average price of a gallon of diesel fell 1.1 cent to $2.983, which is 24.3 cents lower than a year ago, according to the U.S. Energy Information Administration.