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

Return flights

03 Dec - 10 Dec	Avianca
04 Dec - 11 Dec	Air Transat
05 Dec - 12 Dec	Air Transat
11 Dec - 18 Dec	Air Transat
10 Dec - 17 Dec	Air Transat
12 Dec - 19 Dec	Air Transat
12 Dec - 22 Dec	Air Transat	direct
15 Dec - 22 Dec	Air Transat	direct
06 Dec - 13 Dec	Air Transat
09 Dec - 16 Dec	Air Canada
30 Dec - 15 Jan	Air Transat
30 Dec - 12 Jan	Air Transat
31 Dec - 14 Jan	Air Transat
12 Dec - 10 Jan	Air Transat
30 Dec - 08 Jan	Air Transat
24 Dec - 14 Jan	Air Transat
26 Dec - 16 Jan	Porter Airlines (Canada) Ltd
31 Dec - 07 Jan	Air Transat
26 Dec - 14 Jan	Porter Airlines (Canada) Ltd
28 Dec - 13 Jan	Delta

Also check the deals for one-way flights from Montreal to San Jose 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 Jose in December from $350

Return flights