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

Return flights

08 Sep - 18 Sep	Icelandair
07 Sep - 17 Sep	Icelandair
20 Sep - 27 Sep	Icelandair
08 Sep - 12 Sep	Icelandair
10 Sep - 17 Sep	Icelandair
10 Sep - 25 Sep	Icelandair
29 Sep - 13 Oct	Scandinavian Airlines
22 Sep - 29 Sep	Icelandair
15 Sep - 23 Sep	Scandinavian Airlines
19 Sep - 29 Sep	Scandinavian Airlines
09 Sep - 14 Sep	Scandinavian Airlines
28 Sep - 05 Oct	Scandinavian Airlines
22 Sep - 13 Oct	Scandinavian Airlines
25 Sep - 02 Oct	Scandinavian Airlines

Also check the deals for one-way flights from Washington 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 Washington to Berlin in September from $514

Return flights