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

Return flights

30 Sep - 05 Oct	easyJet
25 Sep - 07 Oct	Ryanair
13 Sep - 01 Oct	Vueling Airlines
27 Sep - 15 Oct	Norwegian
20 Sep - 08 Oct	Vueling Airlines
27 Sep - 10 Oct	TAP
29 Sep - 05 Oct	Ryanair
27 Sep - 04 Oct	TAP
27 Sep - 13 Oct	Norwegian
27 Sep - 05 Oct	TAP
18 Sep - 21 Sep	KLM
16 Sep - 21 Sep	KLM
13 Sep - 21 Sep	KLM
20 Sep - 23 Sep	easyJet
25 Sep - 30 Sep	Vueling Airlines
07 Sep - 13 Sep	Ryanair
22 Sep - 29 Sep	Ryanair
16 Sep - 19 Sep	Vueling Airlines
10 Sep - 13 Sep	Norwegian
10 Sep - 14 Sep	Norwegian

Also check the deals for one-way flights from Lisbon to Oslo 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 Lisbon to Oslo in September from $213

Return flights