AirHint found the following cheapest return flights from Cardiff (CWL) to Luxemburg (LUX) in September 2025 (see full year).

Return flights

29 Sep - 03 Oct	Ryanair
29 Sep - 10 Oct	Ryanair
30 Sep - 10 Oct	Ryanair
29 Sep - 08 Oct	Ryanair
29 Sep - 06 Oct	Ryanair
29 Sep - 05 Oct	Ryanair
29 Sep - 02 Oct	Ryanair
29 Sep - 09 Oct	Ryanair
29 Sep - 04 Oct	Ryanair
15 Sep - 24 Sep	Ryanair
29 Sep - 07 Oct	Ryanair
14 Sep - 24 Sep	Ryanair
14 Sep - 18 Sep	TUI
19 Sep - 19 Sep	TUI

Also check the deals for one-way flights from Cardiff to Luxemburg 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 Cardiff to Luxemburg in September from 171€

Return flights