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

Return flights

30 Aug - 07 Sep	Norwegian
30 Aug - 02 Sep	Norwegian
30 Aug - 03 Sep	Norwegian
30 Aug - 06 Sep	Norwegian
28 Aug - 07 Sep	Vueling Airlines
30 Aug - 05 Sep	Norwegian
30 Aug - 13 Sep	Norwegian
30 Aug - 06 Sep	Norwegian	direct
30 Aug - 17 Sep	Norwegian
31 Aug - 07 Sep	Ryanair
30 Aug - 31 Aug	Norwegian
23 Aug - 30 Aug	TAP
27 Aug - 29 Aug	Norwegian
23 Aug - 25 Aug	Norwegian
27 Aug - 30 Aug	Norwegian
27 Aug - 30 Aug	Norwegian	direct
21 Aug - 25 Aug	TAP
26 Aug - 30 Aug	TAP
23 Aug - 31 Aug	TAP
27 Aug - 31 Aug	Norwegian

Also check the deals for one-way flights from Lisbon to Oslo in August.

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 August from 150€

Return flights