回复:F1从加拿大旅游回美国,还要签证吗?

If you travel to Canada and stay there for less than 30 days ( I am pretty sure), you don't have to get another visa when you come back to US. But, before you trip, you need to get a signature from your International Advisor on your current I-20, then bring your passport with I-94 and your I-20. If you've ever transfer school, you'd better bring all of your I-20s.

Good luck!

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