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

Return flights

06 Dec - 10 Dec	Ryanair
03 Dec - 08 Dec	Ryanair
05 Dec - 11 Dec	Ryanair
02 Dec - 04 Dec	Ryanair
11 Dec - 13 Dec	Ryanair
01 Dec - 06 Dec	Ryanair
05 Dec - 09 Dec	Ryanair
22 Dec - 31 Dec	Vueling Airlines
05 Dec - 13 Dec	Ryanair
01 Dec - 02 Dec	Ryanair
31 Dec - 05 Jan	Ryanair
25 Dec - 05 Jan	easyJet
23 Dec - 04 Jan	easyJet
19 Dec - 14 Jan	Ryanair
24 Dec - 01 Jan	Ryanair
04 Dec - 15 Jan	Iberia
22 Dec - 01 Jan	Ryanair
21 Dec - 01 Jan	Scandinavian Airlines
26 Dec - 05 Jan	Ryanair
20 Dec - 01 Jan	Ryanair

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

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 December from 137€

Return flights