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

Return flights

30 Aug - 07 Sep	Avianca
15 Aug - 29 Aug	American Airlines
18 Aug - 17 Sep	Avianca
14 Aug - 22 Aug	Avianca
19 Aug - 29 Aug	Avianca
21 Aug - 29 Aug	Avianca
27 Aug - 03 Sep	Avianca
28 Aug - 04 Sep	Copa
31 Aug - 10 Sep	Avianca
26 Aug - 02 Sep	Avianca
30 Aug - 06 Sep	Avianca
14 Aug - 21 Aug	Avianca
21 Aug - 28 Aug	Avianca
14 Aug - 19 Aug	Avianca
14 Aug - 26 Aug	Avianca
18 Aug - 28 Sep	Avianca
19 Aug - 26 Aug	Avianca
30 Aug - 09 Sep	Avianca
25 Aug - 01 Sep	Avianca
24 Aug - 31 Aug	Avianca

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

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 August from 346€

Return flights