Booking ahead is key when it comes to finding cheap international flights, as is having some flexibility with when you can travel. Many international routes have different fares for different seasons or times of the year; flying to Europe is typically cheaper during the spring and fall than during summer or Christmas. And flights to the Caribbean also fluctuate significantly with the season. It’s also worth flying on the days of the week that are lower in price, typically Tuesday, Wednesday and Thursday. Check the ticket prices for the many so-called budget airlines that now operate all over the world, and check prices into different cities that are close by. For example, it may be a lot less expensive to fly into London or Brussels than into Paris, and then take the train from there to Paris, a journey time of under two hours.