Delaware diesel prices today
Delaware diesel prices todayDiesel averages $6.43 a gallon in Delaware on 2 October 2026 — the 20th most expensive of 51 states, and down $0.02 on the week.
Delaware against the other states
$0.06 a gallon above the unweighted mean of AAA's 51 state averages ($6.36). The cheapest diesel is in Texas at $5.79, the dearest in California at $8.38.
Regular gas in Delaware is $4.31, so diesel costs $2.12 more per gallon — and more than premium at $5.21.
Tax on a gallon of diesel
$0.24 federal + $0.22 Delaware · 46th highest of 51. The rest — about $5.96 — 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 Delaware
AAA's diesel averages for 3 Delaware metro areas, cheapest first — $0.01 a gallon between the two ends.
| Metro area | Diesel | vs state |
|---|---|---|
| Milford & Seaford | $6.42 | −$0.01 |
| Wilmington & Newark | $6.43 | +$0.00 |
| Dover | $6.43 | +$0.01 |
Show the data as a table
What a diesel fill-up costs in Delaware
- Diesel car or SUV — 18 gal$115.65
- Heavy-duty pickup — 34 gal$218.45
- Box truck — 60 gal$385.50
- Semi truck, two tanks — 250 gal$1,606.25
Diesel in neighbouring states
More for Delaware
Frequently asked questions
How much is diesel in Delaware today?
$6.43 a gallon, AAA's Delaware average for 2 October 2026 — the 20th most expensive of 51 states. Regular gasoline is $4.31, so diesel costs $2.12 more per gallon.
Are diesel prices going up in Delaware?
Diesel is down $0.02 (0.3%) on a week ago, and up $2.77 on a year ago, when it was $3.66, on AAA's own earlier averages.
Where is diesel cheapest in Delaware?
Of the 3 metro areas AAA reports in Delaware, Milford & Seaford has the cheapest diesel at $6.42 a gallon and Dover the dearest at $6.43. Individual stations vary around these averages.
How much is the diesel tax in Delaware?
$0.46 a gallon: $0.24 federal plus $0.22 in Delaware state taxes and fees, the 46th highest of 51. The state average is $0.36. Rates as of 1 January 2026.
Is diesel cheaper in a neighbouring state?
Yes — New Jersey ($6.38, $0.05 less). On a 100-gallon fill that is up to $4.70; whether it is worth the drive depends on how far the border is.