AirHint found the following cheapest return flights from Boston (BOS) to Cologne (CGN) in December 2025 (see full year).
Return flights
| 04 Dec - 11 Dec | Air Canada | ||
| 04 Dec - 12 Dec | Air Canada | ||
| 14 Dec - 29 Dec | Air Canada | ||
| 19 Dec - 29 Dec | Spirit Airlines | ||
| 23 Dec - 01 Jan | Frontier Airlines |
Also check the deals for one-way flights from Boston to Cologne in December.
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