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

Return flights

16 Sep - 07 Oct	Porter Airlines (Canada) Ltd
23 Sep - 01 Oct	Porter Airlines (Canada) Ltd
21 Sep - 01 Oct	WestJet
23 Sep - 14 Oct	Porter Airlines (Canada) Ltd
28 Sep - 05 Oct	WestJet
11 Sep - 21 Sep	Porter Airlines (Canada) Ltd
23 Sep - 18 Oct	Porter Airlines (Canada) Ltd
11 Sep - 15 Sep	Air Transat
05 Sep - 12 Sep	WestJet
12 Sep - 04 Oct	WestJet
26 Sep - 18 Oct	WestJet
09 Sep - 04 Oct	WestJet
11 Sep - 04 Oct	Air Transat
02 Sep - 27 Sep	Air Transat
03 Sep - 27 Sep	Air Transat

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 $586

Return flights