AirHint found the following cheapest return flights from Calgary (YYC) to Keflavik (KEF) in September 2025 (see full year).

Return flights

15 Sep - 18 Sep	WestJet	direct
21 Sep - 23 Sep	WestJet	direct
15 Sep - 23 Sep	WestJet	direct
15 Sep - 11 Oct	WestJet	direct
22 Sep - 29 Sep	WestJet	direct
17 Sep - 17 Oct	WestJet
21 Sep - 29 Sep	WestJet	direct
24 Sep - 30 Sep	WestJet	direct
24 Sep - 18 Oct	WestJet
28 Sep - 07 Oct	WestJet	direct
29 Sep - 07 Oct	WestJet	direct
15 Sep - 07 Oct	WestJet	direct
15 Sep - 19 Sep	WestJet
19 Sep - 11 Oct	WestJet	direct
19 Sep - 11 Oct	Flair Airlines
19 Sep - 23 Sep	WestJet	direct
15 Sep - 21 Sep	WestJet
19 Sep - 26 Sep	Flair Airlines

Also check the deals for one-way flights from Calgary to Keflavik 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 Calgary to Keflavik in September from 303€

Return flights