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

One-Way flights

30 Sep	Aegean Airlines	direct
21 Sep	Aegean Airlines	direct
29 Sep	Aegean Airlines	direct
24 Sep	Aegean Airlines	direct
23 Sep	Aegean Airlines	direct
22 Sep	Aegean Airlines	direct
27 Sep	Aegean Airlines	direct
02 Sep	Aegean Airlines	direct
01 Sep	Aegean Airlines	direct
17 Sep	Aegean Airlines	direct

Also check the deals for return flights from London to Athens 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 London to Athens in September from 55€

One-Way flights