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

Return flights

03 Dec - 28 Dec	KLM
10 Dec - 17 Dec	Lufthansa
04 Dec - 07 Dec	KLM
01 Dec - 09 Dec	KLM
01 Dec - 07 Dec	KLM
10 Dec - 18 Dec	Air Dolomiti
01 Dec - 24 Jan	KLM
04 Dec - 12 Dec	KLM
04 Dec - 11 Dec	KLM
01 Dec - 14 Dec	KLM
01 Dec - 06 Dec	KLM
15 Dec - 15 Jan	KLM
17 Dec - 17 Jan	KLM
17 Dec - 16 Jan	KLM
31 Dec - 23 Jan	KLM
30 Dec - 07 Jan	Air Dolomiti
24 Dec - 01 Jan	Lufthansa
22 Dec - 01 Jan	Lufthansa
26 Dec - 05 Jan	ITA Airways
04 Dec - 07 Jan	British Airways

Also check the deals for one-way flights from London to Seoul 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 Seoul

Cheap car rent in Seoul

Cheapest return flights from London to Seoul in December from $837

Return flights