Cheapest return flights from Billund to Porto in December from $321

AirHint found the following cheapest return flights from Billund (BLL) to Porto (OPO) in December 2025 (see full year).

Return flights

29 Dec - 06 Jan Scandinavian Airlines
24 Dec - 30 Dec Norwegian Air Sweden AOC
19 Dec - 12 Jan KLM
20 Dec - 12 Jan KLM
18 Dec - 05 Jan Wizz Air Malta
23 Dec - 26 Dec Wizz Air
22 Dec - 26 Dec KLM
20 Dec - 03 Jan Norwegian Air Sweden AOC
25 Dec - 03 Jan KLM
21 Dec - 02 Jan KLM

Also check the deals for one-way flights from Billund to Porto in December.

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