AirHint found the following cheapest return flights from Montreal (YUL) to Sofia (SOF) in May 2026 (see full year).

Return flights

26 May - 02 Jun	SWISS
19 May - 26 May	Air Canada
20 May - 27 May	Air Canada
12 May - 19 May	Lufthansa
13 May - 20 May	Air Canada
18 May - 25 May	SWISS
17 May - 24 May	Air Canada
10 May - 17 May	Air Canada
27 May - 03 Jun	Lufthansa
11 May - 18 May	Air Canada
25 May - 01 Jun	SWISS
21 May - 28 May	Air Canada
14 May - 21 May	Air Canada
28 May - 04 Jun	Lufthansa
29 May - 05 Jun	Lufthansa
30 May - 06 Jun	Lufthansa

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

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 May from $836

Return flights