AirHint found the following cheapest return flights from St. Louis (STL) to London (LHR) in December 2025 (see full year).
Return flights
| 27 Dec - 06 Jan | Austrian Airlines | ||
| 26 Dec - 02 Jan | Lufthansa | ||
| 28 Dec - 04 Jan | Lufthansa | ||
| 25 Dec - 04 Jan | United | ||
| 26 Dec - 04 Jan | United |
Also check the deals for one-way flights from St. Louis to London in December.
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