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

Return flights

03 Dec - 10 Dec	Porter Airlines (Canada) Ltd
02 Dec - 09 Dec	Air Transat
05 Dec - 12 Dec	FrenchBee
11 Dec - 18 Dec	British Airways
09 Dec - 16 Dec	British Airways
07 Dec - 14 Dec	Condor
04 Dec - 11 Dec	Brussels Airlines
01 Dec - 08 Dec	Brussels Airlines
06 Dec - 13 Dec	Brussels Airlines
24 Dec - 31 Dec	Air Canada
31 Dec - 07 Jan	Air Canada
25 Dec - 01 Jan	Lufthansa
29 Dec - 05 Jan	Air Canada
30 Dec - 06 Jan	Air Canada
28 Dec - 04 Jan	Air Canada
27 Dec - 03 Jan	Air Canada
26 Dec - 02 Jan	Air Canada

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 625€

Return flights