Q&A: What do I need to fly to the US?

After 18 months of strict travel control, the US will soon open up its borders to international visitors.
After 18 months of strict travel control, the US will soon open up its borders to international visitors again under new travel restrictions which will kick in on November 8.
President Joe Biden has officially signed a proclamation that will lift current restrictions that bar most non-US citizens who within the last 14 days have been in Ireland, Britain, the 26 Schengen countries in Europe without border controls, Brazil, China, India, South Africa, and Iran.