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

Return flights

24 Sep - 30 Sep	Scandinavian Airlines
03 Sep - 10 Sep	Air Canada
09 Sep - 16 Sep	United
05 Sep - 12 Sep	United
11 Sep - 18 Sep	United
01 Sep - 08 Sep	United
07 Sep - 14 Sep	United
30 Sep - 07 Oct	United
24 Sep - 01 Oct	United
05 Sep - 07 Sep	Air Canada
13 Sep - 20 Sep	United
15 Sep - 22 Sep	United
27 Sep - 04 Oct	United

Also check the deals for one-way flights from St. Louis 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 St. Louis to Amsterdam in September from 620€

Return flights