AirHint found the following cheapest return flights from Athens (ATH) to Billund (BLL) in September 2025 (see full year).

Return flights

18 Sep - 24 Sep	Lufthansa
04 Sep - 11 Sep	Lufthansa
25 Sep - 29 Sep	LOT
04 Sep - 08 Sep	Lufthansa
01 Sep - 08 Sep	LOT
02 Sep - 08 Sep	LOT
08 Sep - 11 Sep	Scandinavian Airlines
01 Sep - 01 Sep	Scandinavian Airlines

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

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 Athens to Billund in September from 188€

Return flights