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

Return flights

31 Oct - 02 Nov	Spirit Airlines
29 Oct - 03 Nov	Spirit Airlines
22 Oct - 27 Oct	Spirit Airlines
06 Oct - 08 Oct	Spirit Airlines
31 Oct - 02 Nov	Air Canada	direct
22 Oct - 27 Oct	Air Canada	direct
06 Oct - 08 Oct	American Airlines	direct
29 Oct - 03 Nov	Air Canada	direct
24 Oct - 26 Oct	Air Canada	direct
10 Oct - 13 Oct	Frontier Airlines
10 Oct - 12 Oct	Spirit Airlines
10 Oct - 12 Oct	Air Canada	direct
10 Oct - 13 Oct	Air Canada	direct

Also check the deals for one-way flights from Philadelphia to Montreal in October.

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 October from $362

Return flights