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

Return flights

02 Sep - 06 Sep	Ryanair
21 Sep - 24 Sep	Ryanair
02 Sep - 10 Sep	Ryanair
04 Sep - 06 Sep	Ryanair
08 Sep - 10 Sep	Ryanair
13 Sep - 16 Sep	Ryanair
02 Sep - 05 Sep	Ryanair
25 Sep - 30 Sep	Ryanair
02 Sep - 09 Sep	Ryanair
01 Sep - 04 Sep	Ryanair
26 Sep - 01 Oct	Ryanair
27 Sep - 01 Oct	Ryanair
27 Sep - 01 Oct	KLM	direct
27 Sep - 10 Oct	KLM	direct
30 Sep - 05 Oct	KLM	direct
30 Sep - 07 Oct	KLM	direct
26 Sep - 01 Oct	KLM	direct
26 Sep - 02 Oct	KLM
27 Sep - 02 Oct	KLM	direct
26 Sep - 02 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 142€

Return flights