As more countries introduce digital travel authorisation systems, travellers often find themselves navigating multiple electronic permit requirements for different destinations. The UK ETA, Canada eTA, and Australia ETA rank among the permits visitors most often need, and the differences between them matter the moment you start planning a multi-country trip. Get one wrong and you can be turned away at check-in. Key Takeaways All three are electronic pre-travel authorisations — UK ETA (£20), Canada eTA (C$7), and Australia ETA (A$20) let visa-exempt nationals register before travelling. Validity periods differ significantly — UK ETA lasts 2 years, Canada eTA lasts 5 years, and Australia ETA lasts 1 year. Processing times are