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

Return flights

12 Oct - 19 Oct	Air Transat
13 Oct - 20 Oct	Porter Airlines (Canada) Ltd
06 Oct - 13 Oct	FrenchBee
05 Oct - 12 Oct	Air Transat
14 Oct - 21 Oct	Air Transat
17 Oct - 24 Oct	FrenchBee
03 Oct - 10 Oct	FrenchBee
07 Oct - 14 Oct	Porter Airlines (Canada) Ltd
15 Oct - 22 Oct	FrenchBee
10 Oct - 17 Oct	FrenchBee
31 Oct - 07 Nov	Air Transat
25 Oct - 01 Nov	Air Transat
28 Oct - 04 Nov	Air Transat
26 Oct - 02 Nov	Air Transat
29 Oct - 05 Nov	Turkish Airlines
27 Oct - 03 Nov	KLM
30 Oct - 06 Nov	Air Canada

Also check the deals for one-way flights from Montreal to Sofia 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 Montreal to Sofia in October from 579€

Return flights