Additionally to a lot of the other answers, Europe is a bit different than the US in that there’s a lot less business air travel, so demand varies much more than in the US throughout the year. Those cheap tickets are probably often in the winter, when demand is lower, and summer flights are often more expensive. It’s also why, while you will see similarly low airfares on Spirit/Frontier/Allegiant/etc. in the US on occasion, for a lot of flights, their prices aren’t significantly lower than fares on United/Delta/AA/etc. (Also, for a lot of the legacy carriers, de-bundling has also resulted in some basic economy fares that may lack add-ons such as seat selection, carryons, and checked baggage.)
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