The usual round-trip price from Montreal to San Diego is about $635 CAD, based on all of our scans. The lowest price we have recorded is $466 CAD, which is 27% below the usual price. Departures in October are cheapest on average ($586 CAD) and departures in March the most expensive ($776 CAD). Prices vary moderately on this route depending on the departure date and when you book. The usual price to San Diego is lower than that of 60% of the 21 destinations we track in North America from Montreal.
All past deals
1 deals · prices in CAD, round trip| Found | Price | Regular price | Savings | Status |
|---|---|---|---|---|
| September 29, 2026 | $466 | $710 | −34% | Past |
What is the best month to fly from Montreal to San Diego? Price by departure month
Average round-trip price of each month's departures, all trip lengths, from all of our scans. The difference compares each month to the average of the months shown: a negative difference means cheaper than average.
| Departure month | Average price | Lowest seen | Difference |
|---|---|---|---|
| October 2026 | $592 | $374 | -14% |
| November 2026 | $597 | $374 | -14% |
| December 2026 | $734 | $411 | +6% |
| January 2027 | $691 | $521 | +0% |
| February 2027 | $705 | $521 | +2% |
| March 2027 | $763 | $521 | +10% |
| April 2027 | $761 | $559 | +10% |
Which weekday is cheapest to depart from Montreal to San Diego?
Each price is compared to the average price of its own departure month, which removes the effect of seasons. A negative difference means cheaper than usual that month.
| Departure day | Difference |
|---|---|
| Monday | +1% |
| Tuesday | -5% |
| Wednesday | -4% |
| Thursday | -1% |
| Friday | +0% |
| Saturday | +2% |
| Sunday | +6% |
Departing on a Tuesday is cheapest (-5% versus the usual price for the month) and departing on a Sunday is the most expensive (+6%).
Which trip length is cheapest from Montreal to San Diego?
Trip length changes the price of a flight from Montreal to San Diego very little in our scans: pick the length that suits you.
When to fly from Montreal to San Diego? 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. Green dots: deals we sent (hover for date and price). Black dot: the cheapest day.
Nov 24, 2026 is the cheapest departure date from Montreal to San Diego in our scans: $551 CAD on average, across all trip lengths and all prices recorded over time.
When to book a flight from Montreal to San Diego? 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 Diego? 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 Diego
Is the best price from Montreal to San Diego really a good deal?
The average price across all of our Montreal → San Diego scans is $635 CAD. Our best spotted price, $466 CAD, is 27% below that average.
How often are there flight deals from Montreal to San Diego?
We have sent only one deal from Montreal to San Diego since the site launched in April 2026. Subscribe so you do not miss the next one.
When is the cheapest time to fly from Montreal to San Diego?
Based on our daily scans, departures from Montreal to San Diego in October are the cheapest (average $586 CAD) and departures in March the most expensive ($776 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 Diego?
Based on our scans, prices for flights from Montreal to San Diego are lowest about 21 weeks before departure (-4% versus the normal price for the same departure date). In the final 2 weeks before departure, the difference is +12%. See the last chart above.
Which weekday is cheapest to depart from Montreal to San Diego?
Departing on a Tuesday is cheapest (-5% versus the usual price for the month) and departing on a Sunday is the most expensive (+6%).
Which trip length is cheapest from Montreal to San Diego?
Trip length changes the price of a flight from Montreal to San Diego very little in our scans: pick the length that suits you.
How long does a deal from Montreal to San Diego 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 Diego drop?
Subscribe to En Plein Vol for free: we email flight deals from Montreal as soon as they are spotted.
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