Do I need a second US visa waiver to re-enter after a short trip from the US to Canada?

I'm an Australian passport holder, travelling with my family to the US for 1 month, including 3 days in Canada. I have the US Visa Waiver Program, as well as the Canadian eTA visa waiver to enter Canada.
I will visit Niagara Falls in Canada for 3 days, June 20-23, by air, and going back to the US to be in New York from June 23-26.
Do I need to get another visa waiver to re-enter the US from Canada?
Best Answer
Do I need to get another visa waiver?
No, you don't. On the other hand, the border officer can grant you a fresh visa waiver when you re-enter the US. From your point of view, however, it makes no difference.
All you really need to worry about is having valid ESTA authorization. If your ESTA application is approved, the resulting authorization is valid for two years, or until your passport expires, whichever is shorter. It can be used for an unlimited number of entries while it is valid.
Historically, the visa waiver program (VWP) has been around far longer than ESTA. People often confuse the two, since ESTA is far more visible to travelers than the VWP. It may not be obvious to you, therefore, that you actually receive your visa waiver from the immigration officer who stamps your passport. Whether the US considers the second entry a new waiver or a continuation of the first one is not significant to you.
The VWP does have rules about traveling to Canada that can be of concern to some visitors. These rules are designed to prevent people from using Canada to extend their VWP stay in the US beyond the 90-day limit. Since your entire trip in North America doesn't even come close to that limit, you do not need to be concerned about these rules.
There is of course a small chance that a border officer would question you about your plans to determine whether you are trying to abuse those rules. It would therefore be a good idea to be able to show your entire itinerary when you return to the US, in case the officer presses the point. But the usual principle applies: don't volunteer anything; don't hide anything.
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Is the visa waiver program multiple entry?
Each approved ESTA application generally is valid for two years and allows for multiple visits to the United States within that period without having to apply for another ESTA approval. Travelers whose passports will expire in less than two years will receive an ESTA valid until the passport's expiration date.How many times can I use the Visa Waiver Program?
There is no limit on the number of times you may enter the U.S. under either ESTA of a visa.How long do you have to leave the US before returning on a tourist visa?
The Normal Rule To be more precise, once an admission is determined to be \u201cfair and reasonable,\u201d the default position is that the visitor is granted a six month time period to stay.Do I need a new ESTA for each trip?
Your ESTA authorization is generally valid for multiple trips over a period of two years (starting the date that you are approved) or until your passport expires, whichever comes first. As long as you received an ESTA authorization to travel, you do not have to reapply during the validity period.What is a Visa Overstay? Consequences and Solutions to Over staying a Visa
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