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

Return flights

22 Aug - 24 Aug	Spirit Airlines
29 Aug - 01 Sep	Spirit Airlines
22 Aug - 24 Aug	American Airlines	direct
08 Aug - 11 Aug	Air Canada	direct
07 Aug - 11 Aug	Air Canada	direct
04 Aug - 07 Aug	Air Canada	direct
06 Aug - 16 Aug	Air Canada	direct
23 Aug - 30 Aug	Air Canada	direct
29 Aug - 01 Sep	Air Canada	direct
01 Aug - 17 Aug	Air Canada	direct

Also check the deals for one-way flights from Philadelphia to Montreal 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 Philadelphia to Montreal in August from $394

Return flights