<human>:  What is the most cost-effective way to travel across Europe?
<bot>: The most cost-effective way to travel across Europe is by taking advantage of budget airlines, taking the bus, or going by train. Using budget airlines, such as Ryanair and EasyJet, to fly between major cities and taking the bus to explore areas in between can be an inexpensive way to travel. Taking the train also tends to be cheaper than flying or renting a car when you need to cover longer distances.