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

Return flights

08 Sep - 14 Sep	easyJet	direct
11 Sep - 20 Sep	easyJet	direct
29 Sep - 06 Oct	Ryanair
29 Sep - 02 Oct	Ryanair
18 Sep - 25 Sep	easyJet	direct
30 Sep - 01 Oct	Ryanair
28 Sep - 02 Oct	Ryanair
30 Sep - 02 Oct	Ryanair
26 Sep - 28 Sep	Ryanair
29 Sep - 02 Oct	easyJet	direct
30 Sep - 01 Oct	TUI	direct
20 Sep - 22 Sep	Condor
06 Sep - 13 Sep	TUI
04 Sep - 08 Sep	easyJet	direct
12 Sep - 13 Sep	Ryanair
06 Sep - 13 Sep	British Airways	direct
05 Sep - 12 Sep	Ryanair
30 Sep - 02 Oct	British Airways	direct
28 Sep - 02 Oct	British Airways	direct
26 Sep - 08 Oct	SKY express

Also check the deals for one-way 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 return flights from Kos to London in September from $120

Return flights