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

Return flights

07 May - 11 May	easyJet
18 May - 25 May	easyJet
02 May - 09 May	easyJet
06 May - 13 May	easyJet
05 May - 12 May	Vueling Airlines
19 May - 26 May	easyJet
07 May - 14 May	easyJet
11 May - 18 May	Vueling Airlines
12 May - 19 May	easyJet
21 May - 28 May	easyJet
26 May - 02 Jun	TAP
30 May - 17 Jun	Vueling Airlines
30 May - 13 Jun	Vueling Airlines
25 May - 01 Jun	Vueling Airlines
30 May - 06 Jun	Vueling Airlines
27 May - 03 Jun	Transavia France
29 May - 05 Jun	TAP
31 May - 07 Jun	TAP
28 May - 04 Jun	TAP
23 May - 06 Jun	Vueling Airlines

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

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 May from $208

Return flights