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

Return flights

30 Aug - 13 Sep	KLM
29 Aug - 09 Sep	SWISS
29 Aug - 10 Sep	SWISS
14 Aug - 19 Aug	SWISS
15 Aug - 19 Aug	SWISS
20 Aug - 26 Aug	SWISS
21 Aug - 26 Aug	KLM
14 Aug - 16 Aug	SWISS
12 Aug - 18 Aug	KLM
25 Aug - 28 Aug	KLM
21 Aug - 28 Aug	KLM
12 Aug - 19 Aug	KLM
20 Aug - 01 Sep	KLM
25 Aug - 01 Sep	KLM
30 Aug - 01 Sep	KLM
21 Aug - 01 Sep	KLM
26 Aug - 01 Sep	KLM
28 Aug - 01 Sep	KLM
12 Aug - 21 Aug	KLM
28 Aug - 03 Sep	KLM

Also check the deals for one-way flights from London to Oslo in August.

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 August from $245

Return flights