Question : Have you considered flying out of an airport besides Rotterdam The Hague Airport (RTM)?
Answer : Lucky for you, there is another airport near Rotterdam. Amsterdam Airport Schiphol (AMS) is 29 miles away, and over the next few months, flights are being priced 27% cheaper than flights from Rotterdam The Hague Airport.
Question : How long do most people stay in Helsinki?
Answer : Of course you're not most people, but if you were, you'd stay roughly two days.
Question : Can you cut down on flight costs by changing the day of the week you travel to Helsinki?
Answer : The best day to fly on a budget this month is Friday. Flexibility is paramount when booking travel plans in order to keep travel costs down.