AirHint found the following cheapest return flights from London (STN) to Keffallinia (EFL) in September 2025 (see full year).

Return flights

02 Sep - 10 Sep	Ryanair
02 Sep - 08 Sep	Ryanair
03 Sep - 10 Sep	Ryanair
01 Sep - 08 Sep	Ryanair
06 Sep - 10 Sep	Ryanair
27 Sep - 29 Sep	Ryanair
25 Sep - 29 Sep	Ryanair
15 Sep - 23 Sep	Ryanair
22 Sep - 24 Sep	Ryanair
06 Sep - 08 Sep	Jet2	direct
24 Sep - 08 Oct	Ryanair	direct
27 Sep - 08 Oct	Ryanair	direct
24 Sep - 01 Oct	Ryanair	direct
27 Sep - 01 Oct	Ryanair	direct
27 Sep - 06 Oct	Ryanair
29 Sep - 08 Oct	Ryanair
27 Sep - 04 Oct	Ryanair
27 Sep - 02 Oct	Ryanair
02 Sep - 06 Oct	Ryanair
17 Sep - 01 Oct	Ryanair	direct

Also check the deals for one-way flights from London to Keffallinia 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.

Book a cheap hotel in Keffallinia

Cheap car rent in Keffallinia

Cheapest return flights from London to Keffallinia in September from $132

Return flights