Yes, there are multiple flights from Tan Son Nhut Intl to Charleston for under 27,617,952₫. The cheapest flight booked recently is on Qatar Airways for just 25,707,710₫, but on average you can expect to pay 50,771,000₫.
There are no direct flights from Tan Son Nhut Intl to Charleston, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.
In Ho Chi Minh City, there will be less rainfall in Ho Chi Minh City compared to Charleston over the next 2 days.
You can imagine temperatures to be in the 35 °C range in April. The weather in Charleston is generally colder than Ho Chi Minh City's. As flight availability is subject to become more limited as peak season approaches it is ideal to book in a timely manner.
A quick flight from Tan Son Nhut Intl to Charleston can take about 33h 40m. Qatar Airways provides one of the quickest options available for as low as 26,582,280₫. This flight may include one or multiple stops.
Flying on Qatar Airways is currently your cheapest option to Charleston, with prices starting at 25,707,712₫. Another option worth looking into is Singapore Airlines, starting at 59,010,356₫ round trip.