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

Return flights

10 Sep - 17 Sep	British Airways
06 Sep - 13 Sep	Icelandair
14 Sep - 21 Sep	Icelandair
24 Sep - 08 Oct	Icelandair
17 Sep - 08 Oct	Icelandair
19 Sep - 06 Oct	Icelandair
18 Sep - 25 Sep	Icelandair
25 Sep - 28 Sep	Icelandair
22 Sep - 29 Sep	Icelandair
26 Sep - 29 Sep	Icelandair
26 Sep - 03 Oct	British Airways
18 Sep - 05 Oct	British Airways
30 Sep - 07 Oct	Scandinavian Airlines
04 Sep - 11 Sep	Frontier Airlines
05 Sep - 12 Sep	Icelandair
05 Sep - 12 Sep	Delta	direct
24 Sep - 08 Oct	Delta	direct
17 Sep - 08 Oct	Delta	direct
19 Sep - 06 Oct	Delta	direct

Also check the deals for one-way flights from Portland 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 Portland to Amsterdam in September from $431

Return flights