AirHint found the following cheapest one-way flights from Kos (KGS) to London (LGW) in September 2025 (see full year).

One-Way flights

16 Sep	Ryanair
17 Sep	TUI	direct
10 Sep	TUI	direct
08 Sep	TUI	direct
15 Sep	TUI	direct
26 Sep	Ryanair
25 Sep	Ryanair
11 Sep	easyJet	direct
22 Sep	easyJet	direct
03 Sep	TUI	direct

Also check the deals for return flights from Kos to London in September.

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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Cheapest one-way flights from Kos to London in September from 66€

One-Way flights