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	Porter Airlines (Canada) Ltd
06 Dec - 13 Dec	Air Transat
02 Dec - 09 Dec	Air Transat
04 Dec - 11 Dec	British Airways
11 Dec - 18 Dec	British Airways
10 Dec - 17 Dec	FrenchBee
07 Dec - 14 Dec	Condor
12 Dec - 19 Dec	TAP
03 Dec - 10 Dec	FrenchBee
23 Dec - 30 Dec	FrenchBee
30 Dec - 06 Jan	FrenchBee
31 Dec - 07 Jan	Air Canada
25 Dec - 01 Jan	Air Canada
29 Dec - 05 Jan	Air Canada
28 Dec - 04 Jan	Air Canada
27 Dec - 03 Jan	Air Canada
26 Dec - 02 Jan	Air Canada
20 Dec - 10 Jan	Lufthansa

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.

Book a cheap hotel in Sofia

Cheap car rent in Sofia

Cheapest return flights from Montreal to Sofia in December from 602€

Return flights