Yes, there are multiple flights from Hanoi to Hakodate for under 48,532,472₫. The cheapest flight booked recently is on ANA for just 48,486,248₫, but on average you can expect to pay 60,804,252₫.
There are no direct flights from Hanoi to Hakodate, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.
There are many flights that can get you from Hanoi to Hakodate in 7h 55m. Fly via ANA to get the fastest option.
Currently priced at 48,486,248₫, ANA will fly you from Hanoi to Hakodate and back. In addition to ANA, many other airlines offer competitively priced options for your trip.