Book cheap flights from Tokyo to Hanoi in with Netflights. If you can’t find what you’re looking for, simply adjust the filters to widen your search.
But when you fly is just as important as who you fly with. If you're flexible on dates, try searching by month to see when the cheapest flights are.
Or you could broaden your search by looking at flights to other airports in Vietnam to see if there are any cheaper options.
Did you know you can also compare hotel and car hire prices in Vietnam with Netflights? Take a look to get an idea of prices in Hanoi.