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

Return flights

05 Sep - 29 Sep	Icelandair
07 Sep - 15 Sep	Condor
08 Sep - 15 Sep	Condor
09 Sep - 16 Sep	United
30 Sep - 07 Oct	United
27 Sep - 01 Oct	Condor
11 Sep - 18 Sep	United
07 Sep - 14 Sep	United
24 Sep - 01 Oct	United
03 Sep - 10 Sep	Icelandair
05 Sep - 12 Sep	Icelandair
01 Sep - 08 Sep	United
18 Sep - 27 Sep	Condor
27 Sep - 04 Oct	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.

Book a cheap hotel in Berlin

Cheap car rent in Berlin

Cheapest return flights from Seattle to Berlin in September from 459€

Return flights