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

Return flights

03 May - 10 May	British Airways
17 May - 24 May	British Airways
31 May - 07 Jun	British Airways
10 May - 17 May	British Airways
04 May - 11 May	Lufthansa
05 May - 12 May	SWISS
06 May - 13 May	Air Canada
01 May - 08 May	Air Canada
02 May - 09 May	Air Canada
24 May - 31 May	FrenchBee
13 May - 18 May	SWISS
25 May - 01 Jun	SWISS
26 May - 02 Jun	SWISS
27 May - 03 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 502€

Return flights