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

One-Way flights

29 Sep	Porter Airlines (Canada) Ltd
23 Sep	Porter Airlines (Canada) Ltd
16 Sep	Porter Airlines (Canada) Ltd
30 Sep	WestJet
08 Sep	WestJet
07 Sep	WestJet
15 Sep	WestJet
18 Sep	WestJet
11 Sep	Air Transat
13 Sep	Air Transat

Also check the deals for return 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 one-way flights from Toronto to Sofia in September from $235

One-Way flights