Yes, there are multiple flights from Vietnam to Cologne/Bonn for under 23,014,960₫. The cheapest flight booked recently is on Turkish Airlines for just 22,462,600₫, but on average you can expect to pay 32,497,124₫.
There are no direct flights from Vietnam to Cologne/Bonn, 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 26,832,912₫ for a flight from Vietnam to Cologne. The cheapest flight overall is 26,832,912₫ while the most popular route, (Hanoi Noibai - Cologne Köln/Bonn) is currently priced at 22,462,600₫.
Singapore Airlines and Turkish Airlines can get you from Vietnam to Cologne/Bonn in just under 19h 50m. Your travel time can differ by up to 6h 20m. Both multi-stop and direct flights can be found to your destination and back.
Turkish Airlines, at 22,462,600₫, was found to be the cheapest airline from Vietnam to Cologne/Bonn. An alternate airline flying to your destination would be Singapore Airlines.