AirHint found the following cheapest return flights from Keflavik (KEF) to Lisbon (LIS) in September 2026 (see full year).
Return flights
| 06 Sep - 10 Sep | KLM | ||
| 10 Sep - 13 Sep | KLM | ||
| 10 Sep - 20 Sep | KLM | ||
| 06 Sep - 10 Sep | Icelandair | direct | |
| 10 Sep - 13 Sep | Icelandair | direct | |
| 10 Sep - 20 Sep | Icelandair | direct |
Also check the deals for one-way flights from Keflavik to Lisbon in September.
Powered by
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.
Find us on social media