Cheapest one-way flights from London to Keflavik in September from 86€

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

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

One-Way flights

18 Sep British Airways direct
22 Sep British Airways direct
28 Sep British Airways direct
29 Sep British Airways direct
03 Sep British Airways direct
20 Sep British Airways direct
13 Sep British Airways direct

Also check the deals for return 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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