AirHint found the following cheapest return flights from Montreal (YUL) to San Jose (SJO) in September 2026 (see full year).

Return flights

11 Sep - 18 Sep	Avianca
23 Sep - 30 Sep	Copa
16 Sep - 23 Sep	Copa
29 Sep - 06 Oct	Copa
30 Sep - 07 Oct	Copa
05 Sep - 12 Sep	Avianca
06 Sep - 13 Sep	Avianca
01 Sep - 08 Sep	Avianca
03 Sep - 10 Sep	Avianca
07 Sep - 14 Sep	Avianca
09 Sep - 16 Sep	Avianca
13 Sep - 20 Sep	Avianca
25 Sep - 02 Oct	Avianca
27 Sep - 04 Oct	Avianca
24 Sep - 01 Oct	Avianca
26 Sep - 03 Oct	Avianca
28 Sep - 05 Oct	Avianca
25 Sep - 02 Oct	Air Transat	direct

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 287€

Return flights