Gas cost from Seattle to Portland
Driving from Seattle to Portland is about 180 miles and takes around 3 hr 19 min. In a car that gets 25 mpg, the gas costs about $39.24 one way, or $78.48 for the round trip, at $5.45 a gallon for regular, the Washington weekly average.
Gas cost by miles per gallon
| Fuel economy | Regular, one way | Regular, return | Diesel, one way |
|---|---|---|---|
| 20 mpg | $49.05 | $98.10 | $59.76 |
| 25 mpg | $39.24 | $78.48 | $47.81 |
| 30 mpg | $32.70 | $65.40 | $39.84 |
| 35 mpg | $28.03 | $56.06 | $34.15 |
| 40 mpg | $24.53 | $49.05 | $29.88 |
Based on the Washington weekly average: $5.45 regular, $6.64 diesel a gallon. US mpg.
Sharing the cost
At 25 mpg, the round trip costs $78.48 in gas. Split between two people that's $39.24 each, or $19.62 each between four.
Cutting the cost of this trip
- Fill up before you hit the interstate where you can, and avoid stations right by the exit.
- Check your tyre pressures before you set off. Under-inflated tyres use more gas.
- Keep a steady speed. Dropping from 75 to 65 mph on a long run saves a noticeable amount.
More ideas in our fuel-saving guides.
Frequently asked questions
How much does it cost to drive from Seattle to Portland?
About $39.24 one way in a car that gets 25 mpg, or $78.48 for the return trip, at $5.45 a gallon for regular, the Washington weekly average.
How far is Seattle from Portland by car?
About 180 miles by road on the fastest route.
How long does it take to drive from Seattle to Portland?
Around 3 hr 19 min without stops or heavy traffic.
How much gas will I need?
About 7.2 gallons at 25 mpg. A less efficient car needs more: check the table above.
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