Cheapest return flights from London to Keflavik in September from $126

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

Return flights

03 Sep - 23 Sep Fly Play direct
25 Sep - 01 Oct Fly Play direct
25 Sep - 05 Oct Fly Play direct
24 Sep - 01 Oct Fly Play direct
23 Sep - 01 Oct Fly Play direct
19 Sep - 06 Oct Fly Play direct
18 Sep - 23 Sep Fly Play direct
19 Sep - 24 Sep Fly Play direct
25 Sep - 29 Sep Fly Play direct
19 Sep - 22 Sep Fly Play direct
21 Sep - 07 Oct Fly Play direct
30 Sep - 05 Oct Fly Play direct
27 Sep - 05 Oct Fly Play direct
30 Sep - 06 Oct Fly Play direct
27 Sep - 01 Oct Fly Play direct
18 Sep - 22 Sep Fly Play direct
12 Sep - 22 Sep Fly Play direct
23 Sep - 29 Sep Fly Play direct
19 Sep - 23 Sep Fly Play direct
12 Sep - 29 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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