Arizona diesel prices today
Arizona diesel prices todayDiesel averages $6.27 a gallon in Arizona on 3 October 2026 — the 28th most expensive of 51 states, and down $0.13 on the week.
Arizona against the other states
$0.08 a gallon below the unweighted mean of AAA's 51 state averages ($6.35). The cheapest diesel is in Texas at $5.78, the dearest in California at $8.38.
Regular gas in Arizona is $4.76, so diesel costs $1.51 more per gallon — and more than premium at $5.46.
Tax on a gallon of diesel
$0.24 federal + $0.27 Arizona · 38th highest of 51. The rest — about $5.75 — is the fuel itself, refining, distribution and the retailer’s margin.
Rates as of 1 January 2026. Local taxes, where they apply, are not included.
Diesel prices by city in Arizona
AAA's diesel averages for 14 Arizona metro areas, cheapest first — $0.48 a gallon between the two ends.
| Metro area | Diesel | vs state |
|---|---|---|
| Tucson | $6.08 | −$0.19 |
| Pima County | $6.09 | −$0.18 |
| Sierra Vista & Douglas | $6.19 | −$0.08 |
| East Valley | $6.21 | −$0.06 |
| Phoenix Proper | $6.21 | −$0.06 |
| Glendale | $6.22 | −$0.05 |
| Phoenix & Mesa | $6.22 | −$0.05 |
| West Valley | $6.22 | −$0.04 |
| Peoria | $6.26 | −$0.01 |
| Scottsdale | $6.35 | +$0.08 |
| Prescott | $6.45 | +$0.18 |
| Yuma | $6.49 | +$0.22 |
| Flagstaff | $6.54 | +$0.28 |
| Lake Havasu & Kingman | $6.55 | +$0.29 |
Show the data as a table
What a diesel fill-up costs in Arizona
- Diesel car or SUV — 18 gal$112.82
- Heavy-duty pickup — 34 gal$213.11
- Box truck — 60 gal$376.08
- Semi truck, two tanks — 250 gal$1,567.00
Diesel in neighbouring states
More for Arizona
Frequently asked questions
How much is diesel in Arizona today?
$6.27 a gallon, AAA's Arizona average for 3 October 2026 — the 28th most expensive of 51 states. Regular gasoline is $4.76, so diesel costs $1.51 more per gallon.
Are diesel prices going up in Arizona?
Diesel is down $0.13 (2.0%) on a week ago, and up $2.63 on a year ago, when it was $3.64, on AAA's own earlier averages.
Where is diesel cheapest in Arizona?
Of the 14 metro areas AAA reports in Arizona, Tucson has the cheapest diesel at $6.08 a gallon and Lake Havasu & Kingman the dearest at $6.55. Individual stations vary around these averages.
How much is the diesel tax in Arizona?
$0.51 a gallon: $0.24 federal plus $0.27 in Arizona state taxes and fees, the 38th highest of 51. The state average is $0.36. Rates as of 1 January 2026.
Is diesel cheaper in a neighbouring state?
Yes — New Mexico ($6.06, $0.21 less). On a 100-gallon fill that is up to $21.20; whether it is worth the drive depends on how far the border is.