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

Return flights

25 Sep - 16 Oct	KLM	direct
25 Sep - 14 Oct	KLM	direct
04 Sep - 03 Oct	KLM	direct
14 Sep - 28 Sep	KLM	direct
17 Sep - 30 Sep	KLM	direct
03 Sep - 17 Sep	KLM	direct
14 Sep - 27 Sep	KLM	direct
10 Sep - 23 Sep	KLM	direct
30 Sep - 16 Oct	KLM	direct
10 Sep - 02 Oct	KLM	direct
11 Sep - 25 Sep	KLM	direct
20 Sep - 23 Sep	KLM	direct
03 Sep - 06 Sep	KLM	direct
21 Sep - 25 Sep	KLM	direct
16 Sep - 19 Sep	KLM	direct
28 Sep - 01 Oct	KLM	direct
30 Sep - 03 Oct	KLM	direct
19 Sep - 05 Oct	KLM	direct
29 Sep - 02 Oct	KLM	direct
30 Sep - 04 Oct	KLM	direct

Also check the deals for one-way flights from London 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 London to Amsterdam in September from 144€

Return flights