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

Return flights

23 Sep - 02 Oct	Flynas
18 Sep - 27 Sep	Pegasus Airlines
19 Sep - 22 Sep	flyadeal
28 Sep - 08 Oct	Flynas
21 Sep - 30 Sep	Pegasus Airlines
15 Sep - 24 Sep	Pegasus Airlines
22 Sep - 29 Sep	Flynas
23 Sep - 30 Sep	Pegasus Airlines
24 Sep - 02 Oct	Flynas
19 Sep - 25 Sep	Flynas
17 Sep - 24 Sep	Flynas
24 Sep - 03 Oct	Flynas
25 Sep - 27 Sep	Flynas
27 Sep - 04 Oct	Flynas
23 Sep - 07 Oct	Flynas
25 Sep - 02 Oct	AJet
23 Sep - 27 Sep	Flynas
23 Sep - 03 Oct	Flynas
28 Sep - 07 Oct	Flynas
24 Sep - 07 Oct	Flynas

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 324€

Return flights