Great question — answering as the UphillTech team:
Wikipedia has a pretty good list of budget airlines sorted per country: https://en.wikipedia.org/wiki/List_of_low-cost_airlines This might be very helpful to decide which airline to choose. The flight search website Whichbudget.com might also help. It specifically searches airfares at low-cost carriers.
Full answer by RoflcoptrException: https://travel.stackexchange.com/a/60082 (CC BY-SA 3.0).
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