AirHint found the following cheapest return flights from Washington (IAD) to Frankfurt (FRA) in December 2026 (see full year).
Return flights
| 07 Dec - 21 Dec | TAP | ||
| 11 Dec - 21 Dec | SWISS | ||
| 07 Dec - 21 Dec | Lufthansa | direct | |
| 11 Dec - 21 Dec | Lufthansa | direct | |
| 16 Dec - 04 Jan | TAP | ||
| 16 Dec - 04 Jan | Lufthansa | direct |
Also check the deals for one-way flights from Washington to Frankfurt in December.
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