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

Return flights

13 Aug - 20 Aug	Air Canada
06 Aug - 19 Aug	Aer Lingus
04 Aug - 20 Aug	Aer Lingus
03 Aug - 19 Aug	Aer Lingus
04 Aug - 19 Aug	Icelandair
28 Aug - 04 Sep	Aer Lingus
03 Aug - 10 Aug	Air Canada
28 Aug - 19 Sep	Turkish Airlines
13 Aug - 20 Aug	Air France	direct
06 Aug - 19 Aug	Delta	direct
04 Aug - 20 Aug	Delta	direct
04 Aug - 19 Aug	Delta	direct
28 Aug - 18 Sep	Aer Lingus
28 Aug - 04 Sep	Air France	direct
28 Aug - 18 Sep	Air France	direct
28 Aug - 19 Sep	Air France	direct

Also check the deals for one-way flights from Seattle 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 Seattle to Amsterdam in August from $456

Return flights