AirHint found the following cheapest return flights from Kansas City (MCI) to Barcelona (BCN) in December 2025 (see full year).
Return flights
| 10 Dec - 15 Dec | KLM | ||
| 26 Dec - 17 Jan | Frontier Airlines | ||
| 22 Dec - 15 Jan | KLM |
Also check the deals for one-way flights from Kansas City to Barcelona in December.
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