Flight Centre has ditched its profit guidance and says uncertain economic conditions and a fear of travelling to the United States could reduce its earnings this financial year by more than $100 million.

The Trump administration has increased immigration checks and border security measures, leading to concerns among tourists and other travellers that they will be met with a hostile reception if they visit the US. Official figures show March saw the steepest drop in travellers from Australia since the COVID-19 pandemic, with visitor numbers down 7 per cent.