Yes, you can absolutely do an online check-in for Qantas, and it’s one of the most convenient ways to start your journey. Qantas allows passengers to check in online through its official website or via the Qantas mobile app, making the entire process smooth and efficient. Online check-in becomes available 24 hours before the scheduled departure time of your flight. This service is accessible for both domestic and international flights, although there are slight variations in cut-off times: online check-in closes 30 minutes before departure for domestic flights and 90 minutes before departure for international flights.

To use the online check-in feature, all you need is your booking reference number (also known as a Passenger Name Record or PNR) and the last name of the traveler. Once you input this information on the Qantas website or app, you can select or confirm your seat, update your passport and travel details (especially important for international travel), and receive your boarding pass electronically. The boarding pass can be saved to your mobile device or printed out, depending on your preference.

If you're traveling with carry-on luggage only, online check-in allows you to bypass the check-in counter altogether and go straight to security and your departure gate. This significantly saves time, especially during busy travel periods. For travelers with checked baggage, you can still benefit from online check-in by using the self-service bag drop kiosks available at most major domestic and international terminals. These kiosks are typically open from 90 minutes to 30 minutes before domestic flights, and from 3 hours to 90 minutes before international flights.

There are some exceptions where online check-in may not be available. For example, passengers requiring special assistance, traveling with pets, unaccompanied minors, or those part of a large group booking may be required to check in at the airport. In such cases, it’s best to arrive early and complete the process at a staffed Qantas check-in counter.

In conclusion, online check-in with Qantas is a fast, user-friendly option that enhances the overall travel experience. It not only reduces time spent in airport lines but also offers added flexibility in seat selection and travel preferences. Whether you're flying domestically or internationally, Qantas' online check-in is a reliable tool that helps get your journey off to a smooth start.