AirHint found the following cheapest one-way flights from London (LHR) to Helsinki (HEL) in December 2025 (see full year).

One-Way flights

04 Dec	Scandinavian Airlines
15 Dec	Scandinavian Airlines
05 Dec	Scandinavian Airlines
03 Dec	Scandinavian Airlines
10 Dec	Scandinavian Airlines
02 Dec	Scandinavian Airlines
06 Dec	Scandinavian Airlines
14 Dec	KLM
03 Dec	Finnair	direct
02 Dec	Finnair	direct

Also check the deals for return flights from London to Helsinki in December.

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 Helsinki in December from 85€

One-Way flights