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

Return flights

27 Sep - 04 Oct	Pegasus Airlines
16 Sep - 24 Sep	AJet
23 Sep - 04 Oct	AJet
15 Sep - 24 Sep	Pegasus Airlines
24 Sep - 02 Oct	Flynas
30 Sep - 09 Oct	Flynas
24 Sep - 07 Oct	Flynas
15 Sep - 22 Sep	Pegasus Airlines
25 Sep - 02 Oct	Flynas
24 Sep - 03 Oct	Flynas
30 Sep - 03 Oct	Flynas
16 Sep - 26 Sep	AJet
17 Sep - 24 Sep	Pegasus Airlines
26 Sep - 03 Oct	Flynas
09 Sep - 18 Sep	Pegasus Airlines
18 Sep - 29 Sep	AJet
18 Sep - 23 Sep	AJet
28 Sep - 08 Oct	Pegasus Airlines
23 Sep - 30 Sep	Pegasus Airlines
18 Sep - 26 Sep	AJet

Also check the deals for one-way flights from Riyadh to Lisbon 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 Riyadh to Lisbon in September from $380

Return flights