AirHint found the following cheapest return flights from Toronto (YYZ) to Sofia (SOF) in September 2025 (see full year).

Return flights

30 Sep - 07 Oct	Air Transat
11 Sep - 15 Sep	TAP
21 Sep - 06 Oct	WestJet
29 Sep - 05 Oct	Porter Airlines (Canada) Ltd
18 Sep - 25 Sep	TAP
13 Sep - 13 Oct	WestJet
20 Sep - 29 Sep	WestJet
26 Sep - 06 Oct	WestJet
02 Sep - 17 Sep	Flair Airlines
13 Sep - 31 Oct	WestJet
16 Sep - 11 Oct	WestJet
15 Sep - 11 Oct	Porter Airlines (Canada) Ltd
17 Sep - 05 Oct	WestJet
11 Sep - 04 Oct	TAP
03 Sep - 27 Sep	TAP

Also check the deals for one-way flights from Toronto to Sofia in September.

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 Toronto to Sofia in September from 461€

Return flights