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

Return flights

10 Dec - 22 Dec	United
10 Dec - 17 Dec	United
14 Dec - 22 Dec	United
05 Dec - 14 Dec	Porter Airlines (Canada) Ltd
15 Dec - 22 Dec	United
03 Dec - 10 Dec	United
09 Dec - 16 Dec	United
07 Dec - 14 Dec	Air Transat
12 Dec - 14 Dec	WestJet
09 Dec - 17 Dec	United
31 Dec - 08 Jan	United
31 Dec - 07 Jan	United
29 Dec - 05 Jan	WestJet
30 Dec - 06 Jan	WestJet
27 Dec - 03 Jan	WestJet
17 Dec - 05 Jan	WestJet
25 Dec - 01 Jan	WestJet
23 Dec - 02 Jan	WestJet
26 Dec - 02 Jan	WestJet
21 Dec - 04 Jan	WestJet

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 $325

Return flights