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

Return flights

08 Jul - 15 Jul	Ryanair
19 Jul - 26 Jul	TAP
25 Jul - 01 Aug	Fly Play	direct
18 Jul - 25 Jul	Fly Play	direct
28 Jul - 04 Aug	Ryanair
11 Jul - 14 Jul	Fly Play	direct
16 Jul - 23 Jul	Vueling Airlines
07 Jul - 14 Jul	Fly Play	direct
01 Jul - 08 Jul	Ryanair
15 Jul - 20 Jul	Ryanair
17 Jul - 24 Jul	Transavia France
04 Jul - 18 Jul	Fly Play	direct
31 Jul - 25 Aug	Transavia France
28 Jul - 04 Aug	Fly Play	direct
20 Jul - 03 Aug	Vueling Airlines

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

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 July from $363

Return flights