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

Return flights

28 Sep - 17 Oct	WestJet
07 Sep - 19 Sep	WestJet
02 Sep - 23 Sep	WestJet
08 Sep - 19 Sep	WestJet
29 Sep - 12 Oct	WestJet
17 Sep - 30 Sep	WestJet
20 Sep - 05 Oct	WestJet
23 Sep - 14 Oct	WestJet
02 Sep - 12 Sep	WestJet
19 Sep - 05 Oct	WestJet
16 Sep - 26 Sep	WestJet
11 Sep - 30 Sep	WestJet
10 Sep - 30 Sep	WestJet
10 Sep - 26 Sep	WestJet
10 Sep - 21 Sep	WestJet
11 Sep - 01 Oct	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 $1016

Return flights