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

Return flights

13 Jul - 24 Jul	SWISS
25 Jul - 01 Aug	Fly Play	direct
04 Jul - 09 Jul	SWISS
07 Jul - 09 Jul	easyJet
14 Jul - 16 Jul	Iberia Express
10 Jul - 16 Jul	Iberia Express
25 Jul - 03 Aug	Fly Play
15 Jul - 19 Jul	Fly Play
10 Jul - 21 Jul	Iberia Express
11 Jul - 17 Jul	SWISS
06 Jul - 17 Jul	Wizz Air Malta
24 Jul - 03 Aug	Fly Play
16 Jul - 18 Jul	easyJet
21 Jul - 04 Aug	Iberia Express
21 Jul - 04 Aug	Fly Play	direct
27 Jul - 10 Aug	Vueling Airlines
20 Jul - 10 Aug	Vueling Airlines
20 Jul - 03 Aug	Vueling Airlines

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

Book a cheap hotel in Lisbon

Cheap car rent in Lisbon

Cheapest return flights from Keflavik to Lisbon in July from $368

Return flights