Cost to drive from Portland to Boise
Driving from Portland to Boise covers 431 miles (694 km) and takes about 7h 55min without stops. At Oregon's current fuel prices (week of 2026-07-20), the fuel for the trip costs about $66.40 in a typical petrol car — here's the full breakdown for petrol, diesel and electric.
Enter your fuel economy and see stops along the way.
How this cost is calculated
We take the real driving distance between Portland and Boise (431 miles) from OpenStreetMap routing, then multiply by a typical car's fuel use and Oregon's current average pump price. The petrol 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 planner for your exact numbers, and check live prices on the Oregon fuel prices page.
Related routes
Frequently asked questions
How much does it cost to drive from Portland to Boise?
The drive is 431 miles (694 km) and takes about 7h 55min without stops. Fuel costs roughly $66.40 in an average petrol car, $67.04 in a diesel, and $20.95 in an electric car, using Oregon's current fuel prices.
How far is it from Portland to Boise in miles and km?
About 431 miles or 694 kilometres by road — roughly 7h 55min of driving.
Is it cheaper to fill up in Portland or Boise?
Petrol is cheaper in Idaho ($4.23/gal) than in Oregon ($4.62/gal), so wait to fill up when you arrive.
How do I get the exact cost for my car?
Open the FuelWide route planner, enter your car's fuel economy, and it prices the trip on live data — and shows fuel or charging stops along the way.
Driving distance via OSRM / OpenStreetMap. Fuel prices are Oregon's current official averages; efficiency and electricity rate are typical estimates. Your figure will vary — use the planner for an exact result.