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

Return flights

28 Sep - 08 Oct	flyadeal
30 Sep - 07 Oct	flyadeal
30 Sep - 03 Oct	flyadeal
27 Sep - 08 Oct	AJet
29 Sep - 02 Oct	AJet
29 Sep - 07 Oct	flyadeal
26 Sep - 01 Oct	flyadeal
26 Sep - 02 Oct	flyadeal
24 Sep - 02 Oct	flyadeal
26 Sep - 06 Oct	flyadeal
22 Sep - 30 Sep	Pegasus Airlines
25 Sep - 29 Sep	Flynas
24 Sep - 30 Sep	flyadeal
22 Sep - 29 Sep	Pegasus Airlines
24 Sep - 28 Sep	flyadeal
22 Sep - 28 Sep	Pegasus Airlines
23 Sep - 30 Sep	Pegasus Airlines
23 Sep - 25 Sep	Turkish Airlines
24 Sep - 27 Sep	flyadeal
22 Sep - 26 Sep	Pegasus Airlines

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 318€

Return flights