Cheapest return BLL–OPO flights, September

AirHint found the following cheapest return flights from Billund (BLL) to Porto (OPO) in September 2026 (see full year).

Return flights

25 Sep - 09 Oct Norwegian Air Sweden AOC
26 Sep - 10 Oct Wizz Air Malta
05 Sep - 12 Sep Lufthansa
09 Sep - 14 Sep Air France
18 Sep - 21 Sep KLM
18 Sep - 20 Sep Norwegian Air Sweden AOC
07 Sep - 11 Sep Norwegian Air Sweden AOC direct
07 Sep - 14 Sep Norwegian Air Sweden AOC direct
07 Sep - 21 Sep Norwegian Air Sweden AOC direct
25 Sep - 09 Oct Norwegian Air Sweden AOC direct
18 Sep - 21 Sep Norwegian Air Sweden AOC direct
11 Sep - 21 Sep Norwegian Air Sweden AOC direct
18 Sep - 05 Oct Norwegian Air Sweden AOC direct
25 Sep - 05 Oct Norwegian Air Sweden AOC direct

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

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