The usual round-trip price from Montreal to San Juan is about $679 CAD, based on all of our scans. The lowest price we have recorded is $390 CAD, which is 43% below the usual price. Departures in October are cheapest on average ($522 CAD) and departures in December the most expensive ($931 CAD). Prices swing a lot on this route, so waiting for a price drop can pay off. The usual price to San Juan is lower than that of 82% of the 35 destinations we track in Caribbean from Montreal.
All past deals
2 deals · prices in CAD, round trip| Found | Price | Regular price | Savings | Status |
|---|---|---|---|---|
| September 23, 2026 | $390 | $718 | −46% | Past |
| June 19, 2026 | $409 | $669 | −39% | Past |
What is the best month to fly from Montreal to San Juan? 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 | $537 | $390 | -22% |
| November 2026 | $612 | $408 | -11% |
| December 2026 | $922 | $409 | +34% |
| January 2027 | $635 | $396 | -8% |
| February 2027 | $705 | $418 | +3% |
| March 2027 | $764 | $463 | +11% |
| April 2027 | $632 | $449 | -8% |
Which weekday is cheapest to depart from Montreal to San Juan?
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 | +8% |
| Tuesday | -10% |
| Wednesday | -7% |
| Thursday | +4% |
| Friday | +7% |
| Saturday | -5% |
| Sunday | +2% |
Departing on a Tuesday is cheapest (-10% versus the usual price for the month) and departing on a Monday is the most expensive (+8%).
Which trip length is cheapest from Montreal to San Juan?
Each price is compared to the average price of its own departure date, which compares trips of different lengths leaving on the same day. A negative difference means cheaper than usual for that date.
| Trip length | Difference |
|---|---|
| 7 days or less | -1% |
| 8 to 10 days | -1% |
| 11 to 14 days | +0% |
| 15 to 21 days | +2% |
A stay of 7 days or less is cheapest (-1% versus the usual price for the date) and a stay of 15 to 21 days is the most expensive (+2%).
When to fly from Montreal to San Juan? 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.
Oct 20, 2026 is the cheapest departure date from Montreal to San Juan in our scans: $451 CAD on average, across all trip lengths and all prices recorded over time.
When to book a flight from Montreal to San Juan? 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 Juan? 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 Juan
Is the best price from Montreal to San Juan really a good deal?
The average price across all of our Montreal → San Juan scans is $679 CAD. Our best spotted price, $390 CAD, is 43% below that average.
How often are there flight deals from Montreal to San Juan?
We have sent 2 deals from Montreal to San Juan since the site launched in April 2026, about 0.3 per month. Deals are short-lived: subscribe to get them in time.
When is the cheapest time to fly from Montreal to San Juan?
Based on our daily scans, departures from Montreal to San Juan in October are the cheapest (average $522 CAD) and departures in December the most expensive ($931 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 Juan?
Based on our scans, prices for flights from Montreal to San Juan are lowest about 8 weeks before departure (-5% versus the normal price for the same departure date). In the final 2 weeks before departure, the difference is +9%. See the last chart above.
Which weekday is cheapest to depart from Montreal to San Juan?
Departing on a Tuesday is cheapest (-10% versus the usual price for the month) and departing on a Monday is the most expensive (+8%).
Which trip length is cheapest from Montreal to San Juan?
A stay of 7 days or less is cheapest (-1% versus the usual price for the date) and a stay of 15 to 21 days is the most expensive (+2%).
How long does a deal from Montreal to San Juan 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 Juan drop?
Subscribe to En Plein Vol for free: we email flight deals from Montreal as soon as they are spotted.
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