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

Return flights

29 Aug - 12 Sep	AJet
29 Aug - 11 Sep	AJet
28 Aug - 03 Sep	AJet
21 Aug - 03 Sep	Aegean Airlines
02 Aug - 11 Aug	AJet
20 Aug - 27 Aug	AJet
29 Aug - 04 Sep	AJet
21 Aug - 04 Sep	Aegean Airlines
19 Aug - 27 Aug	AJet
11 Aug - 19 Aug	Etihad Airways
11 Aug - 27 Aug	Lufthansa
17 Aug - 27 Aug	AJet
29 Aug - 05 Sep	AJet
03 Aug - 11 Aug	flyadeal
14 Aug - 23 Aug	Saudia
14 Aug - 28 Aug	flyadeal
01 Aug - 04 Sep	AJet
30 Aug - 12 Sep	AJet
04 Aug - 13 Aug	AJet
22 Aug - 04 Sep	AJet

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 $448

Return flights