AirHint found the following cheapest return flights from St. Louis (STL) to Tokyo (NRT) in December 2025 (see full year).

Return flights

10 Dec - 17 Dec	Air Canada
08 Dec - 29 Dec	Air Canada
03 Dec - 09 Jan	Japan Airlines
04 Dec - 09 Jan	Alaska Airlines
04 Dec - 07 Jan	ANA
10 Dec - 06 Jan	Air Canada
15 Dec - 06 Jan	Air Canada
14 Dec - 06 Jan	Air Canada
06 Dec - 03 Jan	Japan Airlines
15 Dec - 03 Jan	Air Canada
12 Dec - 03 Jan	Air Canada

Also check the deals for one-way flights from St. Louis to Tokyo in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from St. Louis to Tokyo in December from $724

Return flights