Australia requires travelers from the U.S. to obtain an Electronic Travel Authority (ETA) which provides authorization to travel to and enter Australia and is electronically linked to your passport.
An ETA can be applied for online (https://www.eta.immi.gov.au/ETAS3/etas) anytime prior to departure through their website for a $20 AUD fee. It is linked to your passport and will be checked electronically when you check-in for your flight at the airport.
Any international travel requires the use of a passport. If you do not have a passport it is important to apply for one as soon as possible. It often takes four to six weeks to process the paperwork for a passport (and even longer during the peak travel season of March to August).
For questions about obtaining or renewing your passport (American citizens) you can visit travel.state.gov.
* If you have a passport, please note - it is highly recommended that your passport be valid for up to 6 months after your scheduled departure date
* It is also important that you have at least one completely blank page (with no stamps or visas) in your passport. This is a requirement for entry into many countries. If your passport is nearly full it might be a good idea to apply for additional pages.
* If you are a U.S. citizen, we recommend working with G3 Visas and Passports to make the process smooth and easy.
Make several photocopies of your passport. Leave a copy at home with your family and carry a copy with you at all times when you are overseas for identification purposes, money changing, etc. If you should lose your passport, having a copy will speed up the process of replacing it.