AirHint found the following cheapest return flights from St. Louis (STL) to Tokyo (NRT) in December 2025 (see full year).
Return flights
| 03 Dec - 10 Dec | United | ||
| 01 Dec - 08 Dec | Air Canada | ||
| 24 Dec - 11 Jan | United | ||
| 17 Dec - 10 Jan | United | ||
| 18 Dec - 10 Jan | Emirates |
Also check the deals for one-way flights from St. Louis to Tokyo in December.
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