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

Return flights

06 Sep - 15 Sep	Frontier Airlines
04 Sep - 14 Sep	Frontier Airlines
06 Sep - 10 Sep	Frontier Airlines
07 Sep - 16 Sep	Frontier Airlines
15 Sep - 29 Sep	Frontier Airlines
18 Sep - 28 Sep	Frontier Airlines
05 Sep - 14 Sep	Frontier Airlines
05 Sep - 28 Sep	Frontier Airlines
05 Sep - 20 Sep	Frontier Airlines
01 Sep - 06 Sep	Frontier Airlines
30 Sep - 20 Oct	Air Canada
30 Sep - 20 Oct	ANA	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 $802

Return flights