AirHint found the following cheapest one-way flights from Washington (IAD) to Tokyo (HND) in September 2025 (see full year).

One-Way flights

25 Sep	Frontier Airlines
29 Sep	Frontier Airlines
19 Sep	Southern Airways Express
18 Sep	Southern Airways Express
20 Sep	Southern Airways Express
22 Sep	Frontier Airlines
26 Sep	Frontier Airlines
24 Sep	Hawaiian Airlines
23 Sep	Hawaiian Airlines
21 Sep	Air Canada

Also check the deals for return flights from Washington 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 one-way flights from Washington to Tokyo in September from $529

One-Way flights