Cheapest one-way flights from Washington to Hanoi in September from $440

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

One-Way flights

16 Sep Korean Air
18 Sep Korean Air

Also check the deals for return flights from Washington to Hanoi in September.

Skyscanner

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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