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

Return flights

08 Dec - 16 Dec	Norwegian	direct
08 Dec - 09 Dec	Norwegian	direct
08 Dec - 13 Dec	Norwegian	direct
01 Dec - 16 Dec	Norwegian	direct
01 Dec - 09 Dec	Norwegian	direct
01 Dec - 06 Dec	Norwegian	direct
01 Dec - 13 Dec	Norwegian	direct
08 Dec - 15 Dec	Norwegian	direct
09 Dec - 16 Dec	Wizz Air Malta	direct
09 Dec - 13 Dec	Wizz Air Malta	direct
27 Dec - 05 Jan	Lufthansa
27 Dec - 01 Jan	KLM

Also check the deals for one-way flights from Oslo to Bucharest 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 Oslo to Bucharest in December from 100€

Return flights