AirHint found the following cheapest return flights from London (LCY) to Oslo (OSL) in September 2026 (see full year).

Return flights

16 Sep - 30 Sep	KLM
26 Sep - 30 Sep	KLM
26 Sep - 01 Oct	KLM
25 Sep - 30 Sep	KLM
24 Sep - 29 Sep	KLM
26 Sep - 29 Sep	KLM
23 Sep - 30 Sep	KLM
25 Sep - 06 Oct	Lufthansa
26 Sep - 03 Oct	KLM
05 Sep - 06 Sep	KLM
05 Sep - 12 Sep	KLM
04 Sep - 06 Sep	KLM
02 Sep - 06 Sep	KLM
26 Sep - 02 Oct	KLM
30 Sep - 04 Oct	Lufthansa

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

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 September from 186€

Return flights