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

Return flights

22 Sep - 06 Oct	Porter Airlines (Canada) Ltd
25 Sep - 29 Sep	Porter Airlines (Canada) Ltd
17 Sep - 30 Sep	Porter Airlines (Canada) Ltd
15 Sep - 06 Oct	Porter Airlines (Canada) Ltd
28 Sep - 06 Oct	WestJet
24 Sep - 29 Sep	WestJet
26 Sep - 30 Sep	WestJet
12 Sep - 20 Sep	WestJet
19 Sep - 07 Oct	WestJet
19 Sep - 23 Sep	WestJet
19 Sep - 27 Sep	WestJet
12 Sep - 07 Oct	WestJet
12 Sep - 16 Sep	WestJet
10 Sep - 16 Sep	WestJet
05 Sep - 13 Sep	Porter Airlines (Canada) Ltd

Also check the deals for one-way flights from Hamilton 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 Hamilton to Keflavik in September from $529

Return flights