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

Return flights

31 Dec - 17 Jan	Ryanair	direct
31 Dec - 16 Jan	Ryanair	direct
30 Dec - 17 Jan	Ryanair	direct
31 Dec - 09 Jan	Ryanair	direct
31 Dec - 18 Jan	Ryanair	direct
30 Dec - 09 Jan	Ryanair	direct
31 Dec - 19 Jan	Ryanair	direct
31 Dec - 12 Jan	Ryanair	direct
31 Dec - 08 Jan	Ryanair
30 Dec - 18 Jan	Ryanair	direct
30 Dec - 31 Dec	Ryanair	direct
29 Dec - 30 Dec	Ryanair
28 Dec - 30 Dec	Ryanair
26 Dec - 31 Dec	Ryanair
26 Dec - 28 Dec	Ryanair
27 Dec - 31 Dec	Ryanair
27 Dec - 28 Dec	Ryanair
29 Dec - 30 Dec	Ryanair	direct
26 Dec - 30 Dec	Ryanair
28 Dec - 30 Dec	Ryanair	direct

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.

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Cheapest return flights from London to Helsinki in December from 54€

Return flights