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

Return flights

21 Aug - 26 Aug	Icelandair
13 Aug - 20 Aug	British Airways
13 Aug - 23 Aug	Icelandair
08 Aug - 20 Aug	Icelandair
17 Aug - 24 Aug	Icelandair
13 Aug - 24 Aug	Icelandair
08 Aug - 14 Aug	Icelandair
22 Aug - 27 Aug	Icelandair
18 Aug - 27 Aug	Icelandair
05 Aug - 12 Aug	British Airways
29 Aug - 05 Sep	Icelandair

Also check the deals for one-way flights from Portland to Amsterdam in August.

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 August from $453

Return flights