All travelers who are not US nationals will have restriction from entering United states if in the last 14 days they have been in any of the countries which are placed on the travel ban into U.S.A. The countries which are chosen includes maximum of the Schengen and European countries.
All US citizens, green card holders with family will be allowed to enter the United States. They will have to go through further medical screening if they have been in a country in the last 14 days which has been a hotspot for virus contamination.
If you are unable to travel due to the travel restriction placed to the U.S, you may want to check if you have taken a trip insurance with “Cancel for Any Reason” coverage. If yes, you will be able to cancel your flight 48-hours or more earlier to the departure. In the event of this pandemic most airlines are waiving off fees related to cancelling or changing of flights. You can check with the airline that you have booked your tickets to see if these conditions apply to you.