AirHint found the following cheapest return flights from London (LHR) to Riyadh (RUH) in September 2025 (see full year).

Return flights

02 Sep - 14 Sep	Eurowings
18 Sep - 05 Oct	Eurowings
18 Sep - 21 Sep	Eurowings
01 Sep - 19 Sep	Eurowings
29 Sep - 04 Oct	British Airways
17 Sep - 24 Sep	Eurowings
10 Sep - 26 Sep	Eurowings
10 Sep - 14 Sep	Eurowings
22 Sep - 02 Oct	British Airways
03 Sep - 28 Sep	Eurowings
01 Sep - 15 Sep	KLM
13 Sep - 24 Sep	KLM
20 Sep - 25 Sep	KLM
25 Sep - 02 Oct	KLM
23 Sep - 02 Oct	KLM
24 Sep - 08 Oct	Air France
24 Sep - 02 Oct	Air France
28 Sep - 02 Oct	Air France
27 Sep - 02 Oct	British Airways
26 Sep - 05 Oct	Air France

Also check the deals for one-way flights from London to Riyadh 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 Riyadh in September from $478

Return flights