Isolation is the whole point here, not a design flaw, and Perth knows it. May is the month to watch: fares from Sydney, Melbourne and Brisbane sit near their lowest, around $110-135, before the December-January crowds push prices up 40-60%. Afterpay and Zip are baked into checkout, which matters more once you start pricing in Margaret River wine and a ferry to Rottnest. The new unified terminal precinct handles the traffic well, just budget three hours before an international departure and expect immigration to crawl at peak times.