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

Return flights

07 May - 14 May	FrenchBee
04 May - 11 May	FrenchBee
04 May - 17 Jun	FrenchBee
15 May - 31 May	FrenchBee
28 May - 04 Jun	Air Transat
21 May - 28 May	Air Transat
08 May - 15 May	FrenchBee
06 May - 20 May	FrenchBee
31 May - 07 Jun	FrenchBee
01 May - 08 May	FrenchBee
03 May - 10 May	FrenchBee
10 May - 17 May	Air Transat
06 May - 13 May	FrenchBee
27 May - 03 Jun	FrenchBee
26 May - 02 Jun	WestJet
30 May - 06 Jun	Air Transat
02 May - 30 Jun	FrenchBee
25 May - 01 Jun	FrenchBee
29 May - 05 Jun	Porter Airlines (Canada) Ltd

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 520€

Return flights