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

Return flights

05 Dec - 12 Dec	FrenchBee
07 Dec - 14 Dec	FrenchBee
10 Dec - 17 Dec	FrenchBee
03 Dec - 10 Dec	FrenchBee
31 Dec - 07 Jan	Air Canada
09 Dec - 16 Dec	Air France
02 Dec - 09 Dec	Air France
08 Dec - 15 Dec	Air France
01 Dec - 08 Dec	Air France
11 Dec - 18 Dec	Air Canada
04 Dec - 11 Dec	Air France
29 Dec - 05 Jan	Air Canada
28 Dec - 04 Jan	Air Canada
30 Dec - 06 Jan	Air Canada
25 Dec - 01 Jan	Air Canada
27 Dec - 03 Jan	Air Canada
26 Dec - 02 Jan	Air Canada
21 Dec - 04 Jan	Air Canada
21 Dec - 03 Jan	Air Canada
20 Dec - 04 Jan	SWISS

Also check the deals for one-way flights from Montreal to Sofia in December.

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 December from 675€

Return flights