Update, 6/9: Reuters reports that the US-Canada land border closure will be extended for another 30 days, through at least July 21st.
In general, restrictions for flying between the countries is more relaxed than crossing land borders. Post your experience in the comments!
Originally posted on 5/19:
The US-Canadian border will remain closed for non-essential travel by mutual agreement through at least June 21st.
This is the 2nd extension of the border closure since it was originally closed in March.
Meanwhile, CTV reports that Canadians have had success flying to the US from Toronto and Vancouver. Go figure.