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
10 May - 17 May	British Airways
04 May - 11 May	FrenchBee
05 May - 12 May	Brussels Airlines
06 May - 13 May	Brussels Airlines
13 May - 20 May	Air Transat
12 May - 19 May	Brussels Airlines
21 May - 28 May	Brussels Airlines
28 May - 04 Jun	Brussels Airlines
25 May - 01 Jun	FrenchBee
02 May - 09 May	Condor
14 May - 21 May	Condor
26 May - 02 Jun	SWISS
27 May - 03 Jun	Air Canada
29 May - 05 Jun	Air Canada
22 May - 05 Jun	Lufthansa
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 648€

Return flights