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

Return flights

28 Sep - 19 Oct	Air Transat
14 Sep - 26 Sep	Air Transat
17 Sep - 24 Sep	Air Transat
15 Sep - 27 Sep	Air Transat
03 Sep - 17 Sep	Air Transat
13 Sep - 19 Sep	Air Transat
13 Sep - 27 Sep	Air Transat
13 Sep - 28 Sep	Air Transat
20 Sep - 04 Oct	Air Transat
25 Sep - 12 Oct	Air Transat
25 Sep - 05 Oct	Air Transat
08 Sep - 17 Sep	Air Transat
05 Sep - 12 Sep	WestJet
25 Sep - 02 Oct	Air Transat
25 Sep - 03 Oct	Air Transat
25 Sep - 06 Oct	WestJet
06 Sep - 13 Sep	Air Transat
04 Sep - 04 Oct	Air Transat

Also check the deals for one-way flights from Toronto to Warsaw 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 Warsaw in September from 471€

Return flights