Gas Prices Along Interstate 90
Updated April 5, 2026 — Prices updated regularly from EIA data
Route • 13 states
About Interstate 90
America's longest interstate at 3,020 miles, I-90 runs from Seattle, WA to Boston, MA. It traverses the Northern Rockies, Great Plains, Great Lakes, and New England — going from high-price Washington state to very high-price Massachusetts.
Avg. Price Along Route
$3.30
Est. Trip Fuel Cost
$132
Price Range
$3.03–$3.77
Gas Prices at Each Stop
- MOST EXPENSIVESeattle, WA$3.77
- Spokane, WA$3.76
- Billings, MT$3.20
- CHEAPESTSioux Falls, SD$3.03
- Minneapolis, MN$3.18
- Milwaukee, WI$3.03
- Chicago, IL$3.31
- Cleveland, OH$3.04
- Buffalo, NY$3.58
- Boston, MA$3.15
Fueling Tips for Interstate 90
- Fill up in South Dakota before entering expensive markets along the route.
- Avoid highway exit stations — drive 1-2 miles off the exit to find prices 10-25 cents cheaper.
- The GasBuddy app shows upcoming prices along your route so you can plan fill-up stops.
- Consider a forward fill-up strategy: check prices 50-100 miles ahead.
- Fleet cards and membership fuel programs give additional discounts at qualifying stations along Interstate 90.
Making the Most of Every Road Trip
Smart travelers combine fuel savings with great American collectibles. Limited offers available for road trip enthusiasts.
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