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

Return flights

29 Jul - 04 Aug	Ryanair
24 Jul - 31 Jul	TAP
25 Jul - 02 Aug	TAP
25 Jul - 31 Jul	TAP
27 Jul - 04 Aug	Iberia
22 Jul - 29 Jul	Transavia France
27 Jul - 03 Aug	Iberia
24 Jul - 01 Aug	TAP
29 Jul - 05 Aug	Ryanair
15 Jul - 22 Jul	easyJet
21 Jul - 25 Jul	Fly Play	direct
18 Jul - 25 Jul	Fly Play	direct
11 Jul - 18 Jul	Fly Play	direct
28 Jul - 04 Aug	Transavia France
21 Jul - 01 Aug	Fly Play	direct
17 Jul - 24 Jul	Eurowings
10 Jul - 17 Jul	Eurowings
25 Jul - 01 Aug	TAP
10 Jul - 13 Jul	SWISS
31 Jul - 25 Aug	TAP

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 312€

Return flights