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

Return flights

01 Sep - 05 Sep	Ryanair
13 Sep - 20 Sep	Ryanair
11 Sep - 19 Sep	Ryanair
06 Sep - 15 Sep	Ryanair
06 Sep - 18 Sep	Ryanair
03 Sep - 15 Sep	Vueling Airlines
03 Sep - 16 Sep	Vueling Airlines
13 Sep - 14 Sep	Ryanair
05 Sep - 16 Sep	Ryanair
05 Sep - 15 Sep	Ryanair
29 Sep - 01 Oct	Ryanair
27 Sep - 04 Oct	Ryanair
29 Sep - 09 Oct	KLM	direct
23 Sep - 07 Oct	KLM	direct
25 Sep - 05 Oct	KLM	direct
25 Sep - 06 Oct	KLM	direct
21 Sep - 01 Oct	KLM	direct
29 Sep - 01 Oct	KLM	direct
27 Sep - 04 Oct	KLM	direct
29 Sep - 04 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 128€

Return flights