Cheapest one-way flights from Keflavik to Lisbon in September from 107€

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

AirHint found the following cheapest one-way flights from Keflavik (KEF) to Lisbon (LIS) in September 2025 (see full year).

One-Way flights

23 Sep easyJet
15 Sep Fly Play
15 Sep Fly Play direct

Also check the deals for return flights from Keflavik to Lisbon in September.

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 Lisbon

Cheap car rent in Lisbon