AirHint found the following cheapest return flights from Bilbao (BIO) to Washington (IAD) in December 2025 (see full year).
Return flights
| 04 Dec - 09 Dec | American Airlines | ||
| 04 Dec - 11 Dec | Finnair | ||
| 12 Dec - 29 Dec | TAP | ||
| 11 Dec - 29 Dec | Delta | ||
| 17 Dec - 04 Jan | Vueling Airlines | ||
| 14 Dec - 04 Jan | KLM | ||
| 18 Dec - 04 Jan | KLM | ||
| 19 Dec - 04 Jan | Lufthansa |
Also check the deals for one-way flights from Bilbao to Washington in December.
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