AirHint found the following cheapest return flights from Montreal (YUL) to San Juan (SJU) in December 2025 (see full year).

Return flights

07 Dec - 16 Dec	United
09 Dec - 22 Jan	United
09 Dec - 16 Dec	United
08 Dec - 16 Dec	United
09 Dec - 30 Jan	United
08 Dec - 22 Jan	United
08 Dec - 30 Jan	United
09 Dec - 25 Dec	United
08 Dec - 25 Dec	United
09 Dec - 14 Jan	United
09 Dec - 21 Jan	United
08 Dec - 14 Jan	United
08 Dec - 21 Jan	United
08 Dec - 14 Dec	Porter Airlines (Canada) Ltd
08 Dec - 25 Jan	Porter Airlines (Canada) Ltd
09 Dec - 13 Dec	United
08 Dec - 13 Dec	United
09 Dec - 29 Jan	United
07 Dec - 14 Dec	Porter Airlines (Canada) Ltd
06 Dec - 13 Dec	United

Also check the deals for one-way flights from Montreal to San Juan in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Montreal to San Juan in December from 238€

Return flights