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

Return flights

04 May - 11 May	FrenchBee
12 May - 19 May	SWISS
19 May - 26 May	SWISS
26 May - 02 Jun	SWISS
20 May - 27 May	Air Canada
11 May - 18 May	Air Canada
27 May - 03 Jun	Air Canada
13 May - 20 May	Air Canada
03 May - 10 May	British Airways
18 May - 25 May	SWISS
24 May - 31 May	Air Canada
17 May - 24 May	Air Canada
25 May - 01 Jun	Air Canada
31 May - 07 Jun	Air Canada
28 May - 04 Jun	Air Canada
29 May - 05 Jun	Air Canada
30 May - 06 Jun	Air Canada

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 745€

Return flights