AirHint found the following cheapest return flights from Denver (DEN) to Tokyo (NRT) in September 2025 (see full year).

Return flights

18 Sep - 23 Sep	Frontier Airlines
23 Sep - 27 Sep	Frontier Airlines
09 Sep - 16 Sep	Frontier Airlines
17 Sep - 30 Sep	Frontier Airlines
22 Sep - 03 Oct	Frontier Airlines
03 Sep - 21 Sep	Frontier Airlines
08 Sep - 15 Sep	Frontier Airlines
25 Sep - 29 Sep	Frontier Airlines
15 Sep - 28 Sep	Frontier Airlines
10 Sep - 25 Sep	Hawaiian Airlines
05 Sep - 20 Sep	Frontier Airlines
22 Sep - 03 Oct	United	direct

Also check the deals for one-way flights from Denver to Tokyo in September.

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 Denver to Tokyo in September from 660€

Return flights