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

Return flights

16 Sep - 07 Oct	Ryanair
24 Sep - 01 Oct	easyJet
13 Sep - 17 Sep	Ryanair
16 Sep - 23 Sep	Ryanair
23 Sep - 30 Sep	easyJet
18 Sep - 25 Sep	Ryanair
09 Sep - 09 Oct	easyJet
26 Sep - 01 Oct	easyJet
03 Sep - 13 Sep	KLM
15 Sep - 21 Sep	Ryanair
28 Sep - 02 Oct	Wizz Air
22 Sep - 27 Sep	Ryanair
17 Sep - 24 Sep	Ryanair
20 Sep - 27 Sep	Ryanair
01 Sep - 07 Sep	Ryanair
29 Sep - 03 Oct	easyJet
29 Sep - 06 Oct	easyJet
28 Sep - 04 Oct	Scandinavian Airlines
09 Sep - 09 Oct	TAP	direct
17 Sep - 02 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 $167

Return flights