Diesel Prices in Washington Today
Average diesel price in Washington: $7.310 per gallon on October 20, 2026. EIA U.S. weekly average $6.276. Current
What is the price of diesel in Washington today?
Diesel in Washington averages $7.310 per gallon (AAA daily state average, October 20, 2026), $1.034 more than the U.S. average of $6.276. Washington ranks #50 of 51 for cheapest diesel (1 = cheapest). A loaded semi at about 6.3 mpg spends about $1.16 per mile on fuel in Washington.
per gallon, October 20, 2026
U.S. average $6.276
of 51 (1 = cheapest)
semi truck, today price
Fuel cost per mile in Washington
Estimated diesel cost at the today Washington price of $7.310 a gallon, using fuel economy calibrated to FHWA and NACFE data.
| Truck | Fuel per mile | Fuel per 1,000 miles |
|---|---|---|
| Dry Van38,000 lbs, ~6.3 mpg | $1.16 | $1,163 |
| Reefer38,000 lbs, ~6.0 mpg | $1.21 | $1,211 |
| Flatbed40,000 lbs, ~6.0 mpg | $1.21 | $1,209 |
| Hotshot12,000 lbs, ~8.9 mpg | $0.82 | $821 |
| Box Truck7,000 lbs, ~9.1 mpg | $0.80 | $801 |
Your numbers depend on load weight, speed, terrain and idling. Enter them in the truck fuel cost calculator for an exact estimate.
Frequently asked questions
What is the price of diesel in Washington today?
Diesel in Washington averages $7.310 per gallon (AAA daily state average, October 20, 2026), $1.034 more than the U.S. average of $6.276. Washington ranks #50 of 51 for cheapest diesel (1 = cheapest). A loaded semi at about 6.3 mpg spends about $1.16 per mile on fuel in Washington.
How much does it cost to fill a semi truck in Washington?
At $7.31 a gallon, 150 gallons of diesel costs about $1,096 and 200 gallons about $1,462 in Washington at the today average.
Is diesel cheaper in Washington than nearby states?
Among nearby states in the same region, the cheapest today is Arizona at $6.374 a gallon. Washington is $7.310.
How often are Washington diesel prices updated?
The page checks for new prices twice a day. AAA publishes daily state averages; the EIA weekly regional average is shown only if a state has no daily value. If a source stops updating, the last value stays with its real date and a stale label.
| Arizona | $6.374 |
| Alaska | $6.532 |
| Oregon | $6.740 |
| Nevada | $6.867 |
| Hawaii | $7.250 |
Source: AAA daily state average, October 20, 2026. All 50 states
Running freight through Washington?
Texas Solutions dispatches semis for 5%, hotshots for 7% and box trucks for 8% of weekly gross. We plan lanes to cut empty miles and fuel.
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