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

Return flights

10 Sep - 17 Sep	Avianca
22 Sep - 29 Sep	Avianca
24 Sep - 01 Oct	Avianca
26 Sep - 03 Oct	Avianca
28 Sep - 05 Oct	Avianca
15 Sep - 19 Sep	Avianca
03 Sep - 10 Sep	Avianca
15 Sep - 22 Sep	Avianca
17 Sep - 24 Sep	Avianca
29 Sep - 06 Oct	Avianca
29 Sep - 08 Oct	Avianca
03 Sep - 15 Sep	Avianca
07 Sep - 14 Sep	Avianca
08 Sep - 15 Sep	Avianca
21 Sep - 28 Sep	Avianca
30 Sep - 07 Oct	United
25 Sep - 02 Oct	Copa
24 Sep - 11 Oct	Avianca
27 Sep - 05 Oct	Copa
29 Sep - 10 Oct	Avianca

Also check the deals for one-way flights from Montreal to San Jose in September.

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 September from $343

Return flights