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

Return flights

17 Sep - 22 Sep	Avianca
06 Sep - 30 Sep	Spirit Airlines
25 Sep - 29 Sep	Delta
19 Sep - 28 Sep	Delta
14 Sep - 21 Sep	Copa
04 Sep - 11 Sep	Copa
01 Sep - 08 Sep	Delta
04 Sep - 14 Sep	Delta
01 Sep - 29 Sep	Copa

Also check the deals for one-way flights from San Jose to Montreal 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 San Jose to Montreal in September from $458

Return flights