The usual round-trip price from Montreal to San Francisco is about $734 CAD, based on all of our scans. The lowest price we have recorded is $416 CAD, which is 43% below the usual price. Departures in October are cheapest on average ($707 CAD) and departures in December the most expensive ($824 CAD). Prices vary moderately on this route depending on the departure date and when you book. The usual price to San Francisco is higher than that of 70% of the 21 destinations we track in North America from Montreal.
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When to fly from Montreal to San Francisco? Average price per day
Average round-trip price per departure date, all trip lengths, from all of our scans. Green line: the average price across all of our scans. Black dot: the cheapest day.
Nov 19, 2026 is the cheapest departure date from Montreal to San Francisco in our scans: $657 CAD on average, across all trip lengths and all prices recorded over time.
When to book a flight from Montreal to San Francisco? Price by time before departure
Average round-trip price by how many weeks before departure the price was recorded. Read left to right: as departure gets closer, the price moves. Black dot: the cheapest lead time.
This chart is the average of all prices recorded over time, with all departure dates mixed together. It blends cheap and expensive departures (seasons), which is why its lowest point is much higher than the cheapest day in the previous chart. The next chart isolates the effect of when you book.
When to book a flight from Montreal to San Francisco? Difference from the normal price
Each recorded price is compared to the average price of its own departure date, which removes the effect of seasons. Read left to right up to departure: below the green line means cheaper than usual for that date. Black dot: the cheapest lead time.
Example: -10% means that at that point, the price is on average 10% below the usual price for the same departure date.
FAQ: flights Montreal → San Francisco
Is the best price from Montreal to San Francisco really a good deal?
The average price across all of our Montreal → San Francisco scans is $734 CAD. Our best spotted price, $416 CAD, is 43% below that average.
When is the cheapest time to fly from Montreal to San Francisco?
Based on our daily scans, departures from Montreal to San Francisco in October are the cheapest (average $707 CAD) and departures in December the most expensive ($824 CAD). The chart above shows the average price day by day for the coming year.
How far in advance should I book a flight from Montreal to San Francisco?
Based on our scans, prices for flights from Montreal to San Francisco are lowest about 12 weeks before departure (-5% versus the normal price for the same departure date). In the final 2 weeks before departure, the difference is +36%. See the last chart above.
How long does a deal from Montreal to San Francisco last?
Fare deals disappear fast: we treat a deal as active for 48 hours after it is sent. After that the price may have changed.
How do I get alerted when fares from Montreal to San Francisco drop?
Subscribe to En Plein Vol for free: we email flight deals from Montreal as soon as they are spotted.
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