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

Return flights

03 Dec - 10 Dec	Icelandair
28 Dec - 08 Jan	Lufthansa
04 Dec - 11 Dec	Condor
24 Dec - 17 Jan	Condor
27 Dec - 08 Jan	Air Canada
05 Dec - 13 Dec	Lufthansa
28 Dec - 07 Jan	Air Canada
27 Dec - 07 Jan	Air Canada
14 Dec - 26 Dec	Aer Lingus
23 Dec - 17 Jan	Condor
06 Dec - 13 Dec	Icelandair
27 Dec - 06 Jan	Condor
28 Dec - 06 Jan	Lufthansa
26 Dec - 07 Jan	Delta
18 Dec - 15 Jan	Icelandair
12 Dec - 19 Dec	Alaska Airlines
19 Dec - 26 Dec	WestJet
14 Dec - 21 Dec	Icelandair
20 Dec - 28 Dec	Alaska Airlines
22 Dec - 29 Dec	Alaska Airlines

Also check the deals for one-way flights from Seattle to Berlin in December.

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 December from $521

Return flights