AirHint found the following cheapest return flights from Waterloo (YKF) to Keflavik (KEF) in August 2025 (see full year).

Return flights

25 Aug - 08 Sep	Flair Airlines
12 Aug - 21 Aug	WestJet
01 Aug - 03 Aug	WestJet
11 Aug - 18 Aug	WestJet
01 Aug - 09 Aug	WestJet
22 Aug - 25 Aug	WestJet
14 Aug - 19 Aug	WestJet
17 Aug - 20 Aug	WestJet
27 Aug - 01 Sep	WestJet
28 Aug - 01 Sep	WestJet
22 Aug - 27 Aug	WestJet
01 Aug - 06 Aug	WestJet
23 Aug - 30 Aug	WestJet
29 Aug - 01 Sep	WestJet
28 Aug - 15 Sep	WestJet
28 Aug - 02 Sep	WestJet
22 Aug - 02 Sep	WestJet
21 Aug - 02 Sep	WestJet
19 Aug - 02 Sep	WestJet

Also check the deals for one-way flights from Waterloo to Keflavik in August.

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 Keflavik in August from $645

Return flights