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

Return flights

10 Dec - 17 Dec	KLM
06 Dec - 17 Dec	KLM
23 Dec - 29 Dec	Lufthansa
15 Dec - 09 Jan	Lufthansa
11 Dec - 13 Dec	KLM
05 Dec - 09 Dec	KLM
05 Dec - 08 Dec	KLM
01 Dec - 07 Dec	KLM
23 Dec - 11 Jan	Lufthansa
30 Dec - 02 Jan	KLM
01 Dec - 10 Dec	Lufthansa
05 Dec - 07 Dec	KLM
31 Dec - 02 Jan	KLM
31 Dec - 04 Jan	KLM
19 Dec - 01 Jan	KLM
04 Dec - 07 Dec	KLM
29 Dec - 02 Jan	Lufthansa
19 Dec - 03 Jan	KLM
29 Dec - 01 Jan	Lufthansa
24 Dec - 04 Jan	KLM

Also check the deals for one-way flights from London to Oslo 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 Oslo in December from $240

Return flights