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

Return flights

07 May - 24 May	FrenchBee
28 May - 04 Jun	Air Transat
17 May - 24 May	Air Transat
14 May - 21 May	Air Transat
21 May - 28 May	Air Transat
07 May - 14 May	Air Transat
31 May - 18 Jun	Air Transat
07 May - 25 May	FrenchBee
20 May - 27 May	FrenchBee
08 May - 25 May	TAP
27 May - 03 Jun	FrenchBee
10 May - 17 May	British Airways
31 May - 07 Jun	British Airways
13 May - 20 May	FrenchBee
29 May - 05 Jun	Porter Airlines (Canada) Ltd
26 May - 02 Jun	Porter Airlines (Canada) Ltd
30 May - 06 Jun	Air Transat
25 May - 01 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 611€

Return flights