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

Return flights

25 Aug - 10 Sep	Scandinavian Airlines
10 Aug - 20 Aug	Icelandair
15 Aug - 24 Aug	Scandinavian Airlines
29 Aug - 15 Sep	Icelandair
01 Aug - 08 Aug	Icelandair
01 Aug - 09 Aug	Icelandair
02 Aug - 07 Aug	Icelandair
01 Aug - 07 Aug	Icelandair
12 Aug - 19 Aug	Lufthansa
10 Aug - 11 Aug	Air France

Also check the deals for one-way flights from Seattle to Warsaw 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 Warsaw in August from 393€

Return flights