Yes, there are multiple flights from Hanoi to Fort Huachuca/Sierra Vista for under 27,624,310₫. The cheapest flight booked recently is on United Airlines for just 25,506,446₫, but on average you can expect to pay 52,255,984₫.
There are no direct flights from Hanoi to Fort Huachuca/Sierra Vista, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.
When traveling, it's generally smart to pack in preparation for rain or any other conditions that may arise. The rainfall in Hanoi is roughly similar to Tucson. You can assume this to be the case over the next 14 days.
Expect the weather to be around 39 °C on average in June. As the temperature peaks, try to get your plans done early, as flight price and availability will have an impact on your travels. The climate in Tucson is generally hotter than in Hanoi.
There are many flights that can get you from Hanoi to Fort Huachuca/Sierra Vista in 29h 15m. Fly via ANA or United Airlines to get the fastest option. Both multi-stop and direct flights can be found to your destination and back.
Flying on United Airlines is currently your cheapest option to Fort Huachuca/Sierra Vista, with prices starting at 25,506,446₫. Another option worth looking into is ANA, starting at 79,005,528₫ round trip.