Those who are thinking of planning international travel can refer to various websites to ascertain any travel restrictions for their intended destination and any intermediary stops. Kayak, an online travel agency owned by Booking.com, maintains a website that appears to have comprehensive travel information for all countries.
Visit the website and click on a country to get the latest info.
For example, the info for the United States, in part, states:
The United States has restricted the entry of all foreign nationals who have passed through or have been in Austria, Brazil, Belgium, China, Czechia, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Iran, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland, or the United Kingdom (excluding overseas territories outside of Europe), in the past 14 days. US citizens and permanent residents who have passed through or have been in any of the above countries in the past 14 days may still enter the United States, but must arrive at one of the following airports: Atlanta (ATL), Boston (BOS), Chicago (ORD), Dallas, (DFW), Detroit (DTW), Honolulu (HNL), Los Angeles (LAX), Miami (MIA), New York (JFK or EWR), San Francisco (SFO), Seattle (SEA), and Washington (IAD). Family members of US citizens and permanent residents, and certain other limited categories of visa holders (such as UN staff and diplomats) may also enter; however a Presidential Executive Order of June 22 means that further restrictions on certain visas (H1-B, H2-B, J and L) will be put in place from June 24. To see if you are affected please refer to the US Government’s travel page.
Travelers who are allowed to enter the United States but have passed through or have been in any of the countries named above must quarantine for 14 days once they reach their final destination.
There are currently 1,971,515 active cases of COVID-19 diagnosed in United States and 131,477 deaths as of Jun 29 2020
This site also allows users to select countries for which they would like to receive updates via email.
The most thorough and up to date information may be on the site maintained by the International Air Transport Administration. Visit its website to see the information it provides. I would provide the link, but IATA warns against disseminating the information publicly.
Unless the United States does a much better job of handling the virus, American tourists may be as scarce as hen’s teeth in much of the world sorry to say.