AirHint found the following cheapest return flights from Cologne (CGN) to Basel (BSL) in December 2025 (see full year).

Return flights

19 Dec - 26 Dec	Eurowings
29 Dec - 01 Jan	SunExpress
19 Dec - 23 Dec	Eurowings
25 Dec - 30 Dec	Lufthansa
18 Dec - 20 Dec	Ryanair
27 Dec - 29 Dec	Freebird Airlines
27 Dec - 03 Jan	Freebird Airlines
20 Dec - 20 Dec	Ryanair

Also check the deals for one-way flights from Cologne to Basel 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 Cologne to Basel in December from $327

Return flights