As an Australian traveller, prior to traveling to obtain the US Visa, ideally, allow 72 hours. In the event, you want to travel sooner, note that these visas can be accepted in about a minute. Citizens of Canada do not need ESTAs. Landed immigrants to Canada also do not have to apply for ESTA unless they are traveling to the US. Permanent residents of the usa don’t have to apply for ESTAs.
There are special laws that apply to citizens of VWP countries who decide to visit with the US from Mexico or Canada. Note that while ESTA permits travel into the USA, in case there are any issues detected by US Customs and Border Control upon entry into the nation, it’s their choice as to whether or not to enable you entry. You must obtain one, if you are not able to travel without a visa. This procedure takes a whole lot more than the online ESTA visa procedure. Be canceled during your journey. You might have to return your green card. This is done throughout the airline in the airport. If you arrive on property, you usually won’t need an ESTA. The US government has instituted an Electronic System for Travel Authorization or ESTA before they board airplanes or ships that are headed for the USA. This system is automated and it decides which visitors are eligible to travel under the Visa Waiver Program to the US. If your ESTA expires during your stay, you will not have to reapply for it so as to depart the USA. Another thing to note is that you should always publish your ESTA out prior to leaving your country.