Not required for visitors from the US, the Commonwealth and most of Western Europe for stays up to 180 days. Required by those from more than 130 other countries. However, visa-exempt foreign nationals flying to Canada now require an Electronic Travel Authorization (eTA). This excludes US citizens and those who already have a valid Canadian visa. For more information on the eTA, see www.canada.ca/eta. For visa information, visit the Canada Border Services Agency website.