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	FrenchBee
01 May - 08 May	FrenchBee
28 May - 04 Jun	Air Transat
07 May - 14 May	Air Transat
04 May - 13 May	FrenchBee
14 May - 21 May	Air Transat
27 May - 03 Jun	FrenchBee
18 May - 25 May	FrenchBee
20 May - 27 May	FrenchBee
21 May - 28 May	Air Transat
31 May - 07 Jun	FrenchBee
06 May - 13 May	FrenchBee
29 May - 05 Jun	FrenchBee
02 May - 30 Jun	Lufthansa
26 May - 02 Jun	Air Transat
25 May - 01 Jun	FrenchBee
30 May - 06 Jun	FrenchBee

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 590€

Return flights