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

Return flights

28 May - 04 Jun	Air Transat
14 May - 21 May	Air Transat
21 May - 28 May	Air Transat
07 May - 14 May	Air Transat
10 May - 17 May	British Airways
20 May - 27 May	FrenchBee
31 May - 07 Jun	British Airways
13 May - 20 May	FrenchBee
27 May - 03 Jun	FrenchBee
06 May - 13 May	FrenchBee
04 May - 11 May	FrenchBee
11 May - 18 May	FrenchBee
18 May - 25 May	FrenchBee
29 May - 05 Jun	Air Transat
26 May - 02 Jun	Porter Airlines (Canada) Ltd
30 May - 06 Jun	Air Transat
02 May - 30 Jun	FrenchBee
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 $726

Return flights