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

Return flights

01 Oct - 08 Oct	Avianca
06 Oct - 13 Oct	Avianca
08 Oct - 15 Oct	Avianca
17 Oct - 24 Oct	Avianca
19 Oct - 26 Oct	Avianca
20 Oct - 27 Oct	Avianca
22 Oct - 29 Oct	Avianca
26 Oct - 02 Nov	Avianca
13 Oct - 20 Oct	Avianca
15 Oct - 22 Oct	Avianca
24 Oct - 31 Oct	Avianca
27 Oct - 03 Nov	Avianca
22 Oct - 05 Nov	Avianca
29 Oct - 05 Nov	Avianca
30 Oct - 06 Nov	Air Transat
28 Oct - 04 Nov	Air Canada
31 Oct - 07 Nov	Air Transat
27 Oct - 23 Nov	Avianca
31 Oct - 08 Nov	Air Transat	direct
25 Oct - 01 Nov	Porter Airlines (Canada) Ltd

Also check the deals for one-way flights from Montreal to San Jose 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 Jose in October from $343

Return flights