Gas Prices in Seattle, WA
Updated May 21, 2026 · AAA data · Regular unleaded
Gas Prices in Seattle
Seattle has some of the most expensive gas in the continental US outside California, driven by Washington's high state tax (49¢) and the Pacific Northwest's isolation from US pipeline networks. Costco's multiple Seattle-area locations are the most significant price relief for drivers willing to shop at the warehouse club.
Prices at individual stations can vary by 5–15 cents within the same city depending on brand, location, and local competition. Use apps like GasBuddy to find the cheapest station near you in Seattle.
Frequently Asked Questions
What is the gas price in Seattle right now?
The average regular unleaded price in Seattle, Washington is $5.870/gal as of May 21, 2026. Station prices vary — expect a range of roughly $5.770 to $5.990 across the metro area.
Why is Seattle gas so much more expensive than Denver?
Seattle pays a 49¢ state tax vs Colorado's 22¢ — a 27¢ difference that accounts for most of the gap. Additionally, the Pacific Northwest is relatively isolated from the US pipeline network and depends on a small number of regional refineries, making supply shocks more impactful.
Where is cheapest gas in Seattle?
Costco locations in Issaquah, Kirkland, and Shoreline are consistently the cheapest single-station options in the metro. Fred Meyer fuel centers offer competitive prices with grocery loyalty rewards. ARCO stations in South Seattle and the Eastside often run below average.
When is the cheapest day to buy gas in Seattle?
Nationwide data shows Monday and Tuesday tend to have slightly lower gas prices before weekly demand picks up. Avoid buying gas Thursday through Saturday when prices are typically higher.