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

Return flights

21 Sep - 23 Sep	Ryanair
15 Sep - 17 Sep	easyJet
07 Sep - 14 Sep	Ryanair
22 Sep - 25 Sep	Ryanair
18 Sep - 21 Sep	Ryanair
04 Sep - 07 Sep	Ryanair
04 Sep - 09 Sep	Ryanair
10 Sep - 14 Sep	Ryanair
03 Sep - 13 Sep	KLM
15 Sep - 18 Sep	Ryanair
28 Sep - 01 Oct	Ryanair
13 Sep - 11 Oct	Ryanair
28 Sep - 05 Oct	Wizz Air
28 Sep - 04 Oct	Scandinavian Airlines
26 Sep - 05 Oct	easyJet
17 Sep - 02 Oct	Vueling Airlines
22 Sep - 02 Oct	Vueling Airlines
27 Sep - 04 Oct	Wizz Air
13 Sep - 02 Oct	Vueling Airlines
24 Sep - 15 Oct	Vueling Airlines

Also check the deals for one-way flights from Oslo 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 Oslo to Lisbon in September from $166

Return flights