Before booking any tickets, be sure to compare flights on flight comparison websites like Skyscanner. Don’t assume that low-cost airlines will always have the cheapest tickets. With low-cost airlines, you need to pay for checked baggage, and any extra comfort like a possibility to choose your seat, airport check-in, food, drinks etc. So if you actually want to enjoy all these things, sometimes you might be able to find tickets from a regular airline for almost the same price as low-cost but with all the extras included.
Before booking a flight, consider if the rate is cheaper if paid in another currency. Often budget airlines will make you pay in the currency of the country you're departing from, but this isn't always the case. An important note when doing this: make sure you're using a credit card that is free of foreign-transaction fees, otherwise your attempts to save money doing this will be lost! Our article on money matters for world travellers can help steer you in the right direction for the best credit cards for travel.