Cheapest return flights from London to Keflavik in September from $228

AirHint found the following cheapest return flights from London (LHR) to Keflavik (KEF) in September 2025 (see full year).

Return flights

16 Sep - 23 Sep Lufthansa
16 Sep - 30 Sep Lufthansa
20 Sep - 27 Sep Scandinavian Airlines
25 Sep - 27 Sep Scandinavian Airlines
20 Sep - 24 Sep Scandinavian Airlines
11 Sep - 29 Sep Scandinavian Airlines
27 Sep - 09 Oct Scandinavian Airlines
25 Sep - 29 Sep Scandinavian Airlines
27 Sep - 29 Sep Scandinavian Airlines
15 Sep - 23 Sep SWISS
12 Sep - 23 Sep Scandinavian Airlines
20 Sep - 05 Oct Icelandair direct
26 Sep - 06 Oct British Airways
28 Sep - 01 Oct KLM
29 Sep - 09 Oct Icelandair
29 Sep - 11 Oct Icelandair
27 Sep - 01 Oct Icelandair direct
29 Sep - 04 Oct Icelandair direct
30 Sep - 08 Oct Icelandair direct
26 Sep - 08 Oct British Airways direct

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

Cheap car rent in Keflavik

Feel free to contact us with any feedback or request another flight research.