Cheapest return flights from London to Keflavik in September from 110€

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

Return flights

24 Sep - 01 Oct Fly Play direct
24 Sep - 03 Oct Fly Play direct
23 Sep - 03 Oct Fly Play direct
10 Sep - 24 Sep Fly Play direct
03 Sep - 10 Sep Fly Play direct
25 Sep - 05 Oct Fly Play direct
23 Sep - 01 Oct Fly Play direct
25 Sep - 01 Oct Fly Play direct
24 Sep - 29 Sep Fly Play direct
19 Sep - 24 Sep Fly Play direct
28 Sep - 05 Oct Fly Play direct
03 Sep - 13 Sep Fly Play direct
28 Sep - 03 Oct Fly Play direct
27 Sep - 01 Oct Fly Play direct
04 Sep - 10 Sep Fly Play direct
23 Sep - 29 Sep Fly Play direct
28 Sep - 08 Oct Fly Play direct
25 Sep - 29 Sep Fly Play direct
18 Sep - 24 Sep Fly Play direct
17 Sep - 24 Sep 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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