Yes, there are multiple flights from Tan Son Nhut Intl to Donetsk for under 29,967,728₫. The cheapest flight booked recently is on Turkish Airlines for just 29,091,748₫, but on average you can expect to pay 29,091,748₫.
There are no direct flights from Tan Son Nhut Intl to Donetsk, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.
You can imagine temperatures to be in the 35 °C range in April. The weather in Donetsk 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.
Departing from Tan Son Nhut Intl to Donetsk will take you 15h 35m.
Currently priced at 29,091,748₫, Turkish Airlines will fly you from Tan Son Nhut Intl to Donetsk and back. In addition to Turkish Airlines, many other airlines offer competitively priced options for your trip.