Yes, there are multiple flights from Vietnam to Big Island for under 23,020,258₫. The cheapest flight booked recently is on United Airlines for just 21,086,556₫, but on average you can expect to pay 57,988,028₫.
Due to the rapidly changing circumstances due to COVID-19, airlines like Japan Airlines flying from Vietnam to Kona Intl have implemented new flexible change policies.
There are no direct flights from Vietnam to Big Island, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.
On average you can expect to pay 20,489,412₫ for a flight from Vietnam to Keahole-Kona Intl. The cheapest flight overall is 10,104,973₫ while the most popular route, (Ho Chi Minh City - Kona Intl) is currently priced at 21,201,658₫.
Japan Airlines and United Airlines can get you from Vietnam to Big Island in just under 19h 40m. Your travel time can differ by up to 26m. Both multi-stop and direct flights can be found to your destination and back.
Flying on United Airlines is currently your cheapest option to Big Island, with prices starting at 21,086,556₫. Another option worth looking into is Japan Airlines, starting at 24,585,636₫ round trip.