Cheapest return flights from Lisbon to Keflavik in August from $233

Best time to book flights for Lisbon (LIS) to Keflavik (KEF) flights at AirHint

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

Return flights

29 Aug - 08 Sep Fly Play direct
22 Aug - 29 Aug Fly Play direct
15 Aug - 22 Aug Fly Play direct
18 Aug - 29 Aug Fly Play direct
29 Aug - 07 Sep Fly Play
04 Aug - 11 Aug Fly Play direct
01 Aug - 04 Aug Fly Play direct
01 Aug - 15 Aug Fly Play direct
30 Aug - 06 Sep Ryanair
20 Aug - 27 Aug Ryanair
17 Aug - 24 Aug Ryanair
19 Aug - 26 Aug Ryanair
18 Aug - 25 Aug Fly Play direct
24 Aug - 05 Sep Ryanair
24 Aug - 07 Sep Vueling Airlines

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

Skyscanner

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.

Book a cheap hotel in Keflavik

Cheap car rent in Keflavik