Cheapest return flights from London to Keflavik in September from 122€

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

Return flights

10 Sep - 17 Sep Fly Play direct
10 Sep - 20 Sep Fly Play direct
04 Sep - 15 Sep Fly Play direct
04 Sep - 14 Sep Fly Play direct
17 Sep - 23 Sep Fly Play direct
17 Sep - 24 Sep Fly Play direct
04 Sep - 08 Sep Fly Play direct
04 Sep - 07 Sep Fly Play direct
18 Sep - 24 Sep Fly Play direct
24 Sep - 07 Oct Fly Play direct
20 Sep - 23 Sep Fly Play direct
24 Sep - 05 Oct Fly Play direct
24 Sep - 04 Oct Fly Play direct
29 Sep - 07 Oct Fly Play direct
29 Sep - 04 Oct Fly Play direct
24 Sep - 02 Oct Fly Play direct
28 Sep - 03 Oct Fly Play direct
25 Sep - 05 Oct Fly Play direct
30 Sep - 08 Oct Fly Play direct
27 Sep - 05 Oct Fly Play direct

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

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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.

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