Montreal and Quebec City are the province’s two largest cities, but a litre of gas doesn’t always cost the same in each. The gap between the two is neither fixed nor always in the same direction: it depends on a mix of taxes, competition and market dynamics that shifts from week to week. Here’s what explains the difference — and how to see, in real time, which of the two is cheaper today.
What pushes Montreal prices up
The main structural factor specific to Montreal is fiscal. The Montreal metropolitan region carries a fuel-tax surcharge of 3 cents per litre that doesn’t apply in Quebec City. The proceeds go to the regional transit authority (ARTM) to fund public transit. All else being equal, that tax makes gas inherently more expensive on the island and its surrounding belt than in Quebec City.
What pushes Montreal prices down
Conversely, Montreal enjoys some of the most intense competition in the province. Hundreds of stations fight over its motorists, which keeps anyone from holding an inflated price for long. On some days, that competitive pressure can more than offset the 3-cent surcharge — and make Montreal cheaper than Quebec City. The proximity of supply facilities in the Montreal area also works in its favour on transport costs.
And what about Quebec City?
Quebec City escapes Montreal’s metropolitan surcharge, which removes one cost item at the pump. Competition there is real but less dense than in Greater Montreal. The result: often competitive prices, sometimes below Montreal, sometimes not, depending on the phase of the cycle. To understand the tax mechanics behind these gaps, see our guide on gas taxes in Quebec.
Compare the actual situation today
Rather than quoting a gap in cents that would be wrong tomorrow, the most useful thing is to check the live data. The average prices by region page shows each area’s average side by side, letting you compare the two big cities instantly. To drill down to the station level, open the price map and spot the best option along your route.
Frequently asked questions
Is gas really more expensive in Montreal than in Quebec City?
Not systematically. Montreal pays a regional tax of 3 cents per litre that Quebec City doesn’t, but its stronger competition can erase that difference. Depending on the day, either city can be the cheaper one — hence the value of comparing the live averages.
Why does Montreal have an extra gas tax?
The 3-cent-per-litre surcharge funds the metropolitan region’s public transit through the ARTM. It applies within the Montreal Metropolitan Community, not in the Quebec City area.
Is it worth filling up in Quebec City rather than Montreal?
Only if you’re already passing through: driving there just to save a few cents per litre is never worth it. The right reflex is to check the price before every fill-up, whichever the city, on the map.