While purchasing the first ticket, you can mark the Return button, or after purchasing one-way, you can re-enter the system and purchase the return tickets by examining the reverse route sign with the reverse route sign.
When you search for flights between Cairns and Brisbane, all active companies and flight times on the date you entered are listed. You can find the cheapest flight tickets by sorting this list by price.
The most frequently used airline companies from Cairns to Brisbane are generally
Alliance Airlines,
China Southern Airlines,
Air Pacific,
Air New Zealand,
V Australia,
Air Canada,
Etihad Airways,
Jetstar,
Singapore Airlines,
Emirates,
Hawaiian Airlines,
Qantas Airways
are companies.