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

Return flights

04 Oct - 11 Oct	Air Transat
12 Oct - 19 Oct	FrenchBee
26 Oct - 15 Nov	FrenchBee
18 Oct - 25 Oct	Air Transat
09 Oct - 16 Oct	Air Transat
01 Oct - 08 Oct	FrenchBee
03 Oct - 10 Oct	FrenchBee
15 Oct - 22 Oct	FrenchBee
05 Oct - 12 Oct	Air Transat
08 Oct - 15 Oct	Air Transat
06 Oct - 13 Oct	Air Transat
28 Oct - 04 Nov	Air Transat
30 Oct - 06 Nov	Air Transat
26 Oct - 02 Nov	FrenchBee
25 Oct - 01 Nov	Air Transat
29 Oct - 05 Nov	FrenchBee
27 Oct - 03 Nov	Air Transat
31 Oct - 07 Nov	Porter Airlines (Canada) Ltd

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 543€

Return flights