Once you’ve set a date for your trip, it’s time to snatch a cheap ticket:
Use Skyscanner or Google Flights to find the cheapest flight fares.
Check the Dutch railway NS for saver fare tickets if you’re travelling from within Europe. Don’t forget to check the promotion site for special offers and read the tips for the best rates.
Another option might be an Interrail ticket. Interrail offers different passes that allow you to travel freely throughout Europe.
Also, check the saver fares of the German railway if you are travelling through or from Germany.