The best month to fly between Amsterdam and Frankfurt is August and the most expensive month to fly is October. (Average prices, based on 659 datapoints.)
The best day to arrive at Amsterdam is Tuesday and it would be best to avoid Sunday, as prices are on average 75.07% higher than on Tuesday. (Average prices, based on 648 datapoints.)
The best time to fly is at around 14. (Average prices, based on 816 datapoints.)