AirHint found the following cheapest return flights from Louisville (SDF) to London (LHR) in December 2025 (see full year).
Return flights
| 12 Dec - 22 Dec | KLM | ||
| 10 Dec - 17 Dec | British Airways | ||
| 20 Dec - 28 Dec | Lufthansa | ||
| 24 Dec - 03 Jan | Spirit Airlines |
Also check the deals for one-way flights from Louisville to London in December.
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