Can I fly into Budapest without a return flight?

Hey everyone - I’m new here, and this may be a dumb question, but I need some help! As a U.S. citizen, can I fly into Budapest from London without a return ticket?

Not sure if still relevant, but for posterity’s sake, I’m not aware of any limitations for US citizens, even though the press was pretty loud of reports about “the end of visa-free travel for US citizens in the EU”, no binding changes have been implemented (that I know of anyway). So yes you should be able to fly in without an issue on a tourist/business trip.