You need proper documents to re-enter Canada if you leave, so be sure to check your document expiration dates and renew them if necessary before you travel. If your study permit will expire while you are outside Canada, you should speak with International Student Advising before travelling. It is possible to apply for a new study permit (not a study permit extension) while outside of Canada, but it may take longer depending on your location.
Check Immigration, Refugees and Citizenship Canada (IRCC)'s processing times to plan ahead.
It is best not to leave Canada while an immigration document extension is being processed, especially if your current document will expire while you would be abroad. Connect with an International Student Advising for support if you need to travel under these circumstances.
Due to travel restrictions might be in place in response to the COVID-19 pandemic, before arranging any travels, check if you’re eligible to enter Canada, prepare documents to support essential travel, create and submit a self-isolation plan if needed, and know what to do upon arrival at the airport or border by visiting the Travelling to Canada guide.