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

Return flights

04 Sep - 17 Sep	Icelandair
21 Sep - 11 Oct	Scandinavian Airlines
10 Sep - 17 Sep	United
07 Sep - 15 Sep	Condor
29 Sep - 06 Oct	Condor
17 Sep - 25 Sep	Lufthansa
30 Sep - 07 Oct	United
14 Sep - 21 Sep	United
24 Sep - 01 Oct	United
20 Sep - 02 Oct	Air Canada
26 Sep - 03 Oct	United
28 Sep - 05 Oct	United
22 Sep - 29 Sep	United
18 Sep - 27 Sep	Lufthansa
18 Sep - 25 Sep	Turkish Airlines
20 Sep - 11 Oct	Condor
12 Sep - 19 Sep	United
08 Sep - 15 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 458€

Return flights