Originally Posted by fifty_two

Its not an unusual behaviour , and this question is not obvious


while many factors need to be considered , its mostly a question of supply and demand , maybe economy is almost full on 1 or more flights of your journey then LH ask for more money , however premium economy may not be full

You need to check what are the prices for other ''normal dates'' during the entire year , then you will see if theses prices are regular or not