AirHint found the following cheapest return flights from Riyadh (RUH) to Lisbon (LIS) in August 2025 (see full year).

Return flights

25 Aug - 10 Sep	Turkish Airlines
26 Aug - 09 Sep	Turkish Airlines
26 Aug - 10 Sep	Turkish Airlines
28 Aug - 10 Sep	Flynas
30 Aug - 13 Sep	Flynas
31 Aug - 09 Sep	British Airways
30 Aug - 07 Sep	Flynas
30 Aug - 03 Sep	Flynas
31 Aug - 07 Sep	flyadeal
28 Aug - 05 Sep	Flynas
28 Aug - 31 Aug	Flynas
28 Aug - 30 Aug	Flynas
24 Aug - 31 Aug	KLM
24 Aug - 30 Aug	Qatar Airways
25 Aug - 30 Aug	Flynas

Also check the deals for one-way flights from Riyadh to Lisbon 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 Riyadh to Lisbon in August from $494

Return flights