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

Return flights

28 Oct - 01 Nov	United
28 Oct - 05 Nov	United
28 Oct - 04 Nov	United
21 Oct - 30 Oct	United
01 Oct - 30 Oct	United
21 Oct - 05 Nov	United
21 Oct - 01 Nov	United
29 Oct - 05 Nov	United
28 Oct - 31 Oct	United
22 Oct - 30 Oct	United
22 Oct - 12 Nov	United
15 Oct - 22 Oct	United
07 Oct - 21 Oct	United
07 Oct - 28 Oct	United
21 Oct - 28 Oct	United
31 Oct - 07 Nov	American Airlines
27 Oct - 31 Oct	United
22 Oct - 28 Oct	United
21 Oct - 11 Nov	United
27 Oct - 03 Nov	Porter Airlines (Canada) Ltd

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

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 October from $245

Return flights