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

Return flights

08 Sep - 04 Oct	WestJet	direct
15 Sep - 11 Oct	WestJet	direct
22 Sep - 06 Oct	WestJet	direct
21 Sep - 11 Oct	WestJet	direct
26 Sep - 02 Oct	WestJet	direct
29 Sep - 06 Oct	WestJet	direct
10 Sep - 04 Oct	WestJet	direct
22 Sep - 29 Sep	WestJet	direct
07 Sep - 09 Sep	WestJet	direct
21 Sep - 23 Sep	WestJet	direct
07 Sep - 15 Sep	WestJet	direct
10 Sep - 30 Sep	WestJet	direct
08 Sep - 15 Sep	WestJet	direct
07 Sep - 16 Sep	WestJet	direct
21 Sep - 29 Sep	WestJet	direct
15 Sep - 22 Sep	WestJet	direct
19 Sep - 29 Sep	WestJet	direct
30 Sep - 07 Oct	WestJet
11 Sep - 04 Oct	WestJet
30 Sep - 14 Oct	WestJet

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 $328

Return flights