Arizona vs Utah gas prices
Regular gas is $0.19 a gallon cheaper in Utah — $2.86 on a 15-gallon fill-up. The two share a border, so that gap is worth knowing before you cross it.
Arizona
Utah| Grade | AZ | UT | Diff. | |
|---|---|---|---|---|
| Regular | $4.44 | $4.25 | $0.19UT | Utah |
| Midgrade | $4.82 | $4.54 | $0.28UT | Utah |
| Premium | $5.14 | $4.80 | $0.34UT | Utah |
| Diesel | $5.60 | $5.28 | $0.31UT | Utah |
Where the $0.19 gap actually comes from
None of it is tax. This is the case people assume never happens: Arizona is dearer at the pump while taxing a gallon $0.18 less than Utah. The whole gap is the cost of the fuel itself — refinery proximity, pipeline access and state blend rules — and the tax difference is quietly shrinking it.
Fuel, refining, distribution and marginFederal and state taxes Pre-tax figures are estimates — see the note below.
What the gap is worth
Based on today’s $0.19 per-gallon difference, which moves week to week. Use the fuel cost calculator for your own mileage and vehicle.
Prices by metro area
State averages hide a lot. These are the cheapest metros AAA reports on each side.
Other comparisons
Frequently asked questions
Is gas cheaper in Arizona or Utah?
Regular gas is cheaper in Utah, at $4.25 a gallon against $4.44 in Arizona — a gap of $0.19, or 4.5%. On a 15-gallon fill-up that is $2.86. Figures are AAA daily state averages for 2026-08-02.
Why is gas more expensive in Arizona?
Not because of tax — Arizona actually levies $0.18 a gallon less than Utah. The whole $0.19 gap, and more, is the cost of the fuel itself: refinery proximity, pipeline access and state fuel-blend rules. Tax policy is narrowing this gap rather than causing it.
Is diesel cheaper in Arizona or Utah?
Diesel is cheaper in Utah at $5.28 a gallon, against $5.60 in Arizona — $0.31 a gallon apart.
Is it worth crossing from Arizona into Utah to fill up?
If you are already near the line, yes: a 15-gallon fill saves about $2.86. Driving out of your way for it rarely pays — at $4.44 a gallon and 25 mpg, a 8-mile round trip would eat the whole saving in fuel alone, before your time.