AirHint found the following cheapest return flights from Seattle (SEA) to Bucharest (OTP) in December 2025 (see full year).
Return flights
| 30 Dec - 12 Jan | Lufthansa | ||
| 05 Dec - 27 Dec | WestJet | ||
| 14 Dec - 05 Jan | Hawaiian Airlines | ||
| 15 Dec - 05 Jan | Hawaiian Airlines | ||
| 20 Dec - 27 Dec | Alaska Airlines |
Also check the deals for one-way flights from Seattle to Bucharest in December.
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