AirHint found the following cheapest return flights from Lisbon (LIS) to Keflavik (KEF) in August 2026 (see full year).

Return flights

27 Aug - 03 Sep	TAP
25 Aug - 01 Sep	easyJet
23 Aug - 03 Sep	TAP
29 Aug - 05 Sep	Norwegian
12 Aug - 24 Aug	TAP
31 Aug - 07 Sep	easyJet
18 Aug - 26 Aug	easyJet
16 Aug - 27 Aug	TAP
31 Aug - 05 Sep	TAP
30 Aug - 06 Sep	transavia
30 Aug - 06 Sep	Icelandair	direct
26 Aug - 02 Sep	KLM
05 Aug - 12 Aug	easyJet
18 Aug - 25 Aug	easyJet
23 Aug - 03 Sep	Icelandair	direct
23 Aug - 30 Aug	Icelandair	direct
12 Aug - 19 Aug	easyJet
13 Aug - 20 Aug	Transavia France
02 Aug - 09 Aug	KLM
04 Aug - 11 Aug	Scandinavian Airlines

Also check the deals for one-way flights from Lisbon 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 Lisbon to Keflavik in August from 271€

Return flights