Thunder Bay is northwestern Ontario’s only large fuel market, and it carries the region’s structural premium: long supply hauls and few competing banners keep prices well above southern Ontario on most days. The city’s two historic halves each have their cluster — the Arthur Street and Memorial Avenue corridors on the Fort William side, Red River Road and the north-end strips on the Port Arthur side — with the Memorial Avenue retail spine between them carrying the densest competition.
Because the nearest alternative market is hours away, timing matters more than geography here: Thunder Bay prices move in slow cycles, and filling on the down-drift beats any amount of driving around. The list below ranks every Thunder Bay station we track by current price, refreshed hourly.