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

Return flights

21 Sep - 18 Oct	Ryanair
15 Sep - 17 Sep	Ryanair
22 Sep - 24 Sep	Ryanair
27 Sep - 01 Oct	Ryanair
25 Sep - 01 Oct	Ryanair
29 Sep - 02 Oct	Ryanair
26 Sep - 29 Sep	Ryanair
16 Sep - 22 Sep	Lufthansa	direct
09 Sep - 16 Sep	Lufthansa	direct
21 Sep - 18 Oct	KLM	direct
17 Sep - 22 Sep	Ryanair
20 Sep - 24 Sep	Ryanair
26 Sep - 29 Sep	KLM	direct
18 Sep - 21 Sep	KLM	direct
27 Sep - 28 Sep	KLM	direct
25 Sep - 01 Oct	KLM	direct
29 Sep - 02 Oct	KLM	direct
24 Sep - 01 Oct	KLM	direct
26 Sep - 01 Oct	KLM	direct
30 Sep - 05 Oct	KLM	direct

Also check the deals for one-way flights from Frankfurt 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 Frankfurt to Amsterdam in September from 146€

Return flights