For cheap flights to Europe, make sure you book early. After you book your flights to Europe, check that your passport is up to date. Many countries deny entry if your passport expires less than six months from your arrival date. Unless you have the right passport, you will probably need a visa to enter most countries in Europe. Fortunately, a Schengen Visa allows you to travel to any 26 member countries of the Schengen Area for up to 90 days. To avoid currency conversion and cash withdrawal fees, always try to have the local currency on hand, either in cash or on a card.