If you plan to visit or transit through another country en route to Canada

You should check with that country’s Embassy/Consulate to find out which documents you and your accompanying family members will need to enter and/or transit through on your way to Canada. Make sure you apply well in advance! 

Planning to transit through the United States? 

You may require a visa to transit through the United States on your way to Canada.  Before you book your flight to Canada, you should ensure that you have the proper documents. Check with the United States Embassy or Consulate closest to you.  You can also find information about U.S. visa requirements on the U.S. Department of State website.