Cheapest return flights from London to Keflavik in September from 103€

Best time to book flights for London (STN) to Keflavik (KEF) flights at AirHint

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

Return flights

03 Sep - 17 Sep Fly Play direct
10 Sep - 16 Sep Fly Play direct
24 Sep - 30 Sep Fly Play direct
24 Sep - 01 Oct Fly Play direct
03 Sep - 10 Sep Fly Play direct
02 Sep - 09 Sep Fly Play direct
02 Sep - 10 Sep Fly Play direct
11 Sep - 17 Sep Fly Play direct
15 Sep - 30 Sep Fly Play direct
24 Sep - 02 Oct Fly Play direct
18 Sep - 24 Sep Fly Play direct
25 Sep - 30 Sep Fly Play direct
30 Sep - 11 Oct Fly Play direct
29 Sep - 07 Oct Fly Play direct
27 Sep - 05 Oct Fly Play direct
23 Sep - 01 Oct Fly Play direct
28 Sep - 07 Oct Fly Play direct
25 Sep - 06 Oct Fly Play direct
24 Sep - 03 Oct Fly Play direct
25 Sep - 05 Oct Fly Play 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