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

One-Way flights

15 Aug	Porter Airlines (Canada) Ltd
31 Aug	Delta
05 Aug	Porter Airlines (Canada) Ltd
07 Aug	Porter Airlines (Canada) Ltd
09 Aug	Avianca
31 Aug	Air Canada	direct
15 Aug	Air Canada	direct
06 Aug	Air Canada	direct

Also check the deals for return 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 one-way flights from Montreal to San Jose in August from 228€

One-Way flights