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Costco Gas Prices in Seattle, Washington Today

4401 4th Ave S, Seattle, WA 98134(206) 622-3136

The Costco gas station in Seattle, Washington is one of the cheapest places to fill up in the area. Regular unleaded is currently $3.55 per gallon, diesel is $3.79. Prices are updated multiple times daily to reflect real pump prices at this location. A Costco membership is required to purchase fuel here. Most members save 10–20 cents per gallon compared to regular gas stations nearby, making this one of the best deals on gas near Seattle.

Today's Prices

Updated 3 hrs ago
Regular$3.55per gallon
Premium$4.05per gallon
🚛Diesel$3.79per gallon

Membership required. You need an active membership to purchase fuel at this location.

Station Information

Address
4401 4th Ave S, Seattle, WA 98134
Phone
(206) 622-3136
Weekday Hours
6:00 AM - 9:30 PM
Saturday
6:00 AM - 8:00 PM
Sunday
7:00 AM - 7:00 PM
Membership
Required — $65/year

Location

🗺️

Map coming soon

Frequently Asked Questions — Costco Seattle

The Costco gas station in Seattle is least busy on Tuesday and Wednesday mornings between 7 and 9 AM. Avoid Friday evenings and Saturday mornings — those are the busiest times. On weekdays, lunchtime (11 AM–1 PM) and after 7 PM also tend to be quieter.

Pro Tips for Seattle Costco Gas

  • 1

    Best times to visit: Tuesday and Wednesday mornings (7–9 AM) have the shortest lines at this Seattle location. Avoid Friday evenings and Saturday mornings.

  • 2

    Pull forward: The hoses reach both sides of your car — don't wait for a specific lane. Pull to the first available pump and reach across.

  • 3

    Check prices before you go: Costco updates prices daily based on wholesale fuel costs. Prices can shift 3–10 cents overnight. Bookmark this page and check before you leave.

  • 4

    Nearby alternatives: If the line is too long, check other warehouse club stations near Seattle or browse our brand comparison guide.

  • 5

    Save more with rewards: Stack your warehouse club membership savings with a cash-back credit card. The Costco Anywhere Visa offers 4% back on gas (up to $7,000/year). Sam's Club Mastercard gives 5% back on gas purchases.