AirHint found the following cheapest return flights from Seattle (SEA) to Berlin (BER) in September 2025 (see full year).

Return flights

04 Sep - 08 Sep	Icelandair
23 Sep - 30 Sep	Icelandair
26 Sep - 11 Oct	Scandinavian Airlines
11 Sep - 18 Sep	United
26 Sep - 03 Oct	United
29 Sep - 06 Oct	United
05 Sep - 12 Sep	United
14 Sep - 21 Sep	United
02 Sep - 09 Sep	Icelandair
20 Sep - 27 Sep	Icelandair
17 Sep - 24 Sep	United

Also check the deals for one-way flights from Seattle to Berlin 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 Seattle to Berlin in September from $469

Return flights