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

Return flights

25 Aug - 03 Sep	Aer Lingus
17 Aug - 21 Aug	Icelandair
30 Aug - 13 Sep	Icelandair
16 Aug - 20 Aug	Icelandair
03 Aug - 20 Aug	Scandinavian Airlines
14 Aug - 17 Aug	Icelandair
03 Aug - 20 Aug	Air France	direct
25 Aug - 03 Sep	Delta	direct
14 Aug - 17 Aug	Delta	direct
14 Aug - 31 Aug	Delta	direct
05 Aug - 12 Aug	Air France	direct
17 Aug - 21 Aug	Air France	direct
16 Aug - 20 Aug	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 $606

Return flights