AirHint found the following cheapest return flights from Washington (IAD) to Lyon (LYS) in December 2025 (see full year).
Return flights
| 15 Dec - 08 Jan | Aer Lingus | ||
| 12 Dec - 29 Dec | Frontier Airlines | ||
| 25 Dec - 01 Jan | Air Canada | ||
| 18 Dec - 28 Dec | Frontier Airlines | ||
| 27 Dec - 04 Jan | Lufthansa |
Also check the deals for one-way flights from Washington to Lyon in December.
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