AirHint found the following cheapest return flights from Keflavik (KEF) to Lisbon (LIS) in June 2025 (see full year).

Return flights

24 Jun - 29 Jun	SWISS
27 Jun - 10 Jul	SWISS
26 Jun - 29 Jun	SWISS
19 Jun - 03 Jul	SWISS
20 Jun - 24 Jun	SWISS
18 Jun - 02 Jul	Lufthansa
22 Jun - 27 Jun	Lufthansa
25 Jun - 29 Jun	Lufthansa
23 Jun - 28 Jun	Lufthansa
12 Jun - 13 Jun	Lufthansa
26 Jun - 30 Jun	SWISS
23 Jun - 30 Jun	Iberia Express
23 Jun - 27 Jun	Iberia Express
15 Jun - 04 Jul	easyJet
29 Jun - 11 Jul	SWISS
30 Jun - 07 Jul	Fly Play	direct
29 Jun - 13 Jul	Vueling Airlines
22 Jun - 13 Jul	Vueling Airlines
19 Jun - 03 Jul	TAP	direct
29 Jun - 20 Jul	Vueling Airlines

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

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 Keflavik to Lisbon in June from $295

Return flights