Ryanair. Ryanair is an Irish ultra-low-cost airline headquartered in Swords, County Dublin, Ireland. It is the largest airline in Europe by scheduled passengers carried, fleet size, and total flights. Globally, it is the largest airline by international passengers carried, the third-largest by market capitalisation behind Delta Air Lines and United Airlines, and the fifth-most profitable by net income. In 2025, the company sold 208??million airline tickets, averaging ???70 in total revenue against ???62 in costs per ticket sold. It is widely considered to be the cheapest airline operating in Europe.