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

Return flights

11 Dec - 20 Dec	United
12 Dec - 20 Dec	United
06 Dec - 14 Dec	United
13 Dec - 21 Dec	United
12 Dec - 21 Dec	United
10 Dec - 01 Jan	United
11 Dec - 01 Jan	United
28 Dec - 05 Jan	WestJet
25 Dec - 01 Jan	WestJet
24 Dec - 01 Jan	WestJet
13 Dec - 04 Jan	Porter Airlines (Canada) Ltd
20 Dec - 28 Dec	WestJet
20 Dec - 04 Jan	WestJet
13 Dec - 03 Jan	WestJet
21 Dec - 28 Dec	Porter Airlines (Canada) Ltd
27 Dec - 04 Jan	WestJet
26 Dec - 03 Jan	WestJet

Also check the deals for one-way flights from Toronto 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 Toronto to San Juan in December from $319

Return flights