AirHint found the following cheapest return flights from Waterloo (YKF) to Athens (ATH) in September 2025 (see full year).

Return flights

26 Sep - 12 Oct	WestJet
25 Sep - 03 Oct	WestJet
22 Sep - 20 Oct	WestJet
22 Sep - 19 Oct	WestJet
08 Sep - 17 Oct	WestJet
29 Sep - 20 Oct	WestJet
26 Sep - 05 Oct	WestJet
05 Sep - 21 Sep	WestJet
20 Sep - 06 Oct	WestJet
22 Sep - 06 Oct	WestJet
04 Sep - 10 Sep	WestJet
05 Sep - 08 Sep	WestJet
04 Sep - 07 Sep	WestJet

Also check the deals for one-way flights from Waterloo to Athens 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 Waterloo to Athens in September from $1554

Return flights