Cost to drive from Portland to Seattle
Driving from Portland to Seattle covers 174 miles (280 km) and takes about 3h 27min without stops. At the latest average price in each state along the way, the gas for the trip costs about $32 in a typical gas car — here's the full breakdown for gas, diesel and electric.
State by state: where the gas money goes
The 5.8 gal a typical gas car burns on this drive, priced where it is burned.
Where to fill up
This route is already close to the lowest-cost option — refuel whenever it suits you.
- 1.Any station in Washingtonat 159 mi2 gal at $5.58/gal
Assumes a 13-gallon tank that starts half full. Your car will differ — plan it with your own numbers.
Tolls and vignettes: not included — we hold no verified toll tariffs for United States, and we don't guess them.
Gas, diesel or electric — priced for your car
Pick the kind of car you drive and whether you are coming back. Prices are the average across every state on the route.
Driving Portland → Seattle in a family car, electric costs $28.03 less than diesel — 77% of the bill.
Portland vs Seattle: which end is cheaper?
The two ends of this route are priced by different markets, so where you fill up changes what the drive costs.
What if fuel prices move?
Booking this drive for later in the year? Pump prices swing with crude, season and tax changes — here is the same 174 miles in a typical petrol car at four price levels.
Your car's mpg, tank and fuel level — plus tolls, route options and the cheapest stops.
How this cost is calculated
We take the real driving route between Portland and Seattle (174 miles) from OpenStreetMap routing, work out how far it runs in each state, and price the fuel a typical car burns in each one at that place's latest published average. The gas figure assumes 30 MPG · 7.8 L/100km; diesel and EV use 35 MPG · 6.7 L/100km and 3.5 mi/kWh. Your real cost depends on your car, traffic, driving style and the stations you pick — use the trip planner for your exact numbers, or check prices on the Oregon fuel prices page.
Related routes
Frequently asked questions
How much does it cost to drive from Portland to Seattle?
The drive is 174 miles (280 km) and takes about 3h 27min without stops. Gas costs roughly $32.21 in an average gas car, $36.45 in a diesel, and $8.45 in an electric car, using the latest average price in each state along the way.
Which state has the cheapest gas between Portland and Seattle?
Oregon, at $5.11/gal on average, against $5.58/gal in Washington. On this route the difference makes little change to the total.
How far is it from Portland to Seattle in miles and km?
About 174 miles or 280 kilometres by road — roughly 3h 27min of driving.
Is it cheaper to fill up in Portland or Seattle?
Petrol is cheaper in Oregon ($5.11/gal) than in Washington ($5.58/gal), so fill up before you leave.
How many times will I need to fill up between Portland and Seattle?
None on the way. The drive needs about 5.8 gal of petrol and a typical 15 gal tank covers roughly 450 miles, so one full tank at the start does the whole trip.
Is it cheaper to drive or fly from Portland to Seattle?
On fuel alone the drive costs about $32 one way, and that cost splits across everyone in the car — with $8 each for four people, which is where driving usually wins. Against that, the drive takes 3h 27min without stops, and a fair comparison also counts tolls, parking, wear and any overnight stay.
What will this trip cost if fuel prices change?
At today's prices the gas is about $32. A 10% rise takes it to $35, a 25% rise to $40, and a 10% fall to $29. Prices here refresh as each source publishes, so this page always reflects the latest figures.
How do I get the exact cost for my car?
Set the vehicle type on this page for an instant estimate, or open the FuelWide trip planner with your car's fuel economy, tank size and how full it is — it prices the drive state by state and suggests the cheapest places to stop.
Driving distance via OSRM / OpenStreetMap. Fuel prices are the latest published averages for each state on the route (sources named on each price page); efficiency and electricity rates are typical estimates, and tolls are not included unless listed above. Your figure will vary — use the planner for an exact result.