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

Return flights

29 Dec - 12 Jan	Lufthansa
31 Dec - 10 Jan	KLM
31 Dec - 12 Jan	KLM
31 Dec - 08 Jan	KLM
31 Dec - 07 Jan	KLM
29 Dec - 07 Jan	KLM
31 Dec - 06 Jan	KLM
30 Dec - 11 Jan	KLM
30 Dec - 09 Jan	KLM
29 Dec - 08 Jan	Lufthansa
29 Dec - 31 Dec	Lufthansa
29 Dec - 30 Dec	Lufthansa
28 Dec - 31 Dec	KLM
27 Dec - 31 Dec	KLM
28 Dec - 30 Dec	KLM
28 Dec - 29 Dec	KLM
27 Dec - 28 Dec	KLM
27 Dec - 30 Dec	KLM

Also check the deals for one-way 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.

Book a cheap hotel in Helsinki

Cheap car rent in Helsinki

Cheapest return flights from London to Helsinki in December from 277€

Return flights