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

Return flights

09 Sep - 16 Sep	AJet
09 Sep - 14 Sep	AJet
10 Sep - 17 Sep	AJet
22 Sep - 30 Sep	AJet
22 Sep - 27 Sep	AJet
18 Sep - 26 Sep	Saudia
24 Sep - 01 Oct	AJet
11 Sep - 20 Sep	AJet
17 Sep - 20 Sep	AJet
26 Sep - 05 Oct	AJet
17 Sep - 23 Sep	AJet
26 Sep - 06 Oct	AJet
01 Sep - 10 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.

Book a cheap hotel in Lisbon

Cheap car rent in Lisbon

Cheapest return flights from Riyadh to Lisbon in September from $395

Return flights