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

Return flights

01 Dec - 04 Dec	KLM
03 Dec - 10 Dec	KLM
03 Dec - 07 Dec	KLM
02 Dec - 09 Dec	KLM
03 Dec - 08 Dec	KLM
05 Dec - 07 Dec	KLM
05 Dec - 08 Dec	KLM
11 Dec - 14 Dec	KLM
09 Dec - 14 Dec	KLM
04 Dec - 07 Dec	KLM
24 Dec - 11 Jan	KLM
17 Dec - 23 Jan	KLM
31 Dec - 06 Jan	KLM
01 Dec - 01 Jan	KLM
24 Dec - 01 Jan	KLM
13 Dec - 05 Jan	KLM
13 Dec - 01 Jan	KLM
26 Dec - 08 Jan	Lufthansa
30 Dec - 06 Jan	KLM
29 Dec - 05 Jan	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 214€

Return flights