Cheapest one-way flights from London to Keflavik in September from $168

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

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

One-Way flights

28 Sep British Airways
04 Sep British Airways
01 Sep British Airways
08 Sep Lufthansa
30 Sep British Airways
16 Sep British Airways
10 Sep SWISS
14 Sep KLM
15 Sep SWISS
26 Sep SWISS

Also check the deals for return 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.

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