Cost to drive from Seattle to Boise
Driving from Seattle to Boise covers 492 miles (791 km) and takes about 9h 7min without stops. At Washington's current fuel prices (week of 2026-07-20), the fuel for the trip costs about $83.44 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 Seattle and Boise (492 miles) from OpenStreetMap routing, then multiply by a typical car's fuel use and Washington'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 Washington fuel prices page.
Related routes
Frequently asked questions
How much does it cost to drive from Seattle to Boise?
The drive is 492 miles (791 km) and takes about 9h 7min without stops. Fuel costs roughly $83.44 in an average petrol car, $85.23 in a diesel, and $23.87 in an electric car, using Washington's current fuel prices.
How far is it from Seattle to Boise in miles and km?
About 492 miles or 791 kilometres by road — roughly 9h 7min of driving.
Is it cheaper to fill up in Seattle or Boise?
Petrol is cheaper in Idaho ($4.23/gal) than in Washington ($5.09/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 Washington's current official averages; efficiency and electricity rate are typical estimates. Your figure will vary — use the planner for an exact result.