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
17 May - 24 May	Air Transat
07 May - 14 May	Air Transat
24 May - 31 May	Air Transat
03 May - 10 May	British Airways
16 May - 23 May	Air Transat
21 May - 28 May	Air Transat
14 May - 21 May	Air Transat
18 May - 25 May	FrenchBee
31 May - 07 Jun	British Airways
19 May - 26 May	Air Canada
12 May - 19 May	Air Canada
27 May - 03 Jun	Air Canada
26 May - 02 Jun	Air Canada
25 May - 01 Jun	Air Canada
29 May - 05 Jun	Air Transat

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 730€

Return flights