Cheapest return flights from Keflavik to Lisbon in May from $240

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

Return flights

03 May - 14 May easyJet
07 May - 14 May easyJet
10 May - 14 May easyJet
17 May - 04 Jun easyJet
26 May - 29 May Transavia France
24 May - 28 May Transavia France
28 May - 31 May Wizz Air Malta
22 May - 06 Jun easyJet
25 May - 29 May easyJet
22 May - 24 May KLM
07 May - 14 May Icelandair direct
10 May - 14 May Icelandair direct

Also check the deals for one-way flights from Keflavik to Lisbon in May.

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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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