AirHint found the following cheapest return flights from Seattle (SEA) to Berlin (BER) in December 2025 (see full year).
Return flights
| 30 Dec - 07 Jan | Lufthansa | ||
| 24 Dec - 28 Dec | Condor | ||
| 29 Dec - 03 Jan | Condor | ||
| 21 Dec - 30 Dec | Hawaiian Airlines | ||
| 20 Dec - 03 Jan | Condor |
Also check the deals for one-way flights from Seattle to Berlin in December.
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