AirHint found the following cheapest return flights from London (LCY) to Helsinki (HEL) in October 2025 (see full year).

Return flights

01 Oct - 05 Oct	KLM
09 Oct - 16 Oct	KLM
03 Oct - 06 Oct	KLM
12 Oct - 17 Oct	KLM
11 Oct - 16 Oct	KLM
08 Oct - 15 Oct	KLM
14 Oct - 22 Oct	KLM
01 Oct - 04 Oct	KLM
02 Oct - 05 Oct	KLM
10 Oct - 17 Oct	KLM
31 Oct - 04 Nov	KLM
31 Oct - 05 Nov	KLM
30 Oct - 02 Nov	KLM
28 Oct - 02 Nov	KLM
31 Oct - 02 Nov	KLM
31 Oct - 03 Nov	KLM
25 Oct - 02 Nov	KLM

Also check the deals for one-way flights from London to Helsinki in October.

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 London to Helsinki in October from $257

Return flights