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

Return flights

30 Sep - 01 Oct	Ryanair
23 Sep - 24 Sep	Ryanair
23 Sep - 30 Sep	Ryanair
16 Sep - 17 Sep	Ryanair
22 Sep - 24 Sep	Ryanair
29 Sep - 03 Oct	Ryanair
20 Sep - 23 Sep	Ryanair
27 Sep - 01 Oct	Ryanair
21 Sep - 23 Sep	Ryanair
26 Sep - 06 Oct	Ryanair
22 Sep - 23 Sep	Ryanair
19 Sep - 24 Sep	Ryanair
22 Sep - 27 Sep	Ryanair
25 Sep - 26 Sep	Ryanair
24 Sep - 08 Oct	Vueling Airlines
30 Sep - 07 Oct	KLM	direct
29 Sep - 10 Oct	KLM	direct
24 Sep - 08 Oct	KLM	direct
25 Sep - 05 Oct	KLM	direct
26 Sep - 06 Oct	KLM	direct

Also check the deals for one-way flights from Cardiff to Amsterdam 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 Amsterdam in September from 133€

Return flights