Canberra to Sydney Flights:
On-Time Performance & Reliability

Canberra–Sydney: The highest cancellation rate on the domestic network — and QantasLink is the reason

Canberra–Sydney posts 78.2% on-time in 2025 — above the national average, better than Brisbane–Melbourne, better than Hobart–Melbourne. On punctuality alone it looks like a competent mid-table performer. Then you look at the cancellation rate. At 6.2%, CBR–SYD carries the highest cancellation rate of any route on the domestic network. One in sixteen scheduled sectors does not operate — annually, across all seasons, as a structural feature of this route. The on-time number and the cancellation number are telling two completely different stories, and the cancellation story is the one that matters.

Why Canberra cancels so much

Canberra Airport sits at 578 metres elevation in a frost hollow that generates radiation fog with regularity, particularly in winter mornings. When visibility drops below instrument minima, the airport effectively closes — and unlike Sydney or Melbourne, there is no nearby alternate that keeps the rotation alive. The aircraft simply doesn't go. QantasLink operates the majority of sectors on this route with equipment and rotation structures that have minimal recovery flexibility: when a morning CBR departure cancels, the aircraft scheduled for the return is already out of position, and the next available slot at Sydney may be hours away. Canberra's runway infrastructure and limited apron capacity mean there is no parallel recovery path. June and July are the extreme cases, but the 6.2% annual average reflects a year-round vulnerability — even summer months carry elevated cancellation risk relative to other routes, because the airport's physical characteristics don't disappear when the fog season eases.

When to fly — and what the trend means

January at 83.8% is the best month, benefiting from summer conditions that minimise fog risk and Canberra's relatively low January demand outside the public service calendar. November at 72.8% is the worst on-time month — spring convective weather and end-of-year demand — but notably it is not the worst cancellation month. The avoid list of November, July, and June reflects both problems at different times of year. The trend line adds a wrinkle: CBR–SYD went from 77.3% in 2022 to a peak of 80.0% in 2024, then slipped back to 78.2% in 2025. This is the only route in the dataset showing a regression from its 2024 result. That 1.8-point pullback warrants watching — it may reflect scheduling changes, fleet reallocation, or simply regression to mean, but it sits against a network that broadly continued improving in 2025.

Airline reality check

The carrier split here is the starkest on the network. Qantas mainline at 89.5% and Virgin at 86.4% are both exceptional numbers — among the strongest either carrier posts across any route. QantasLink at 71.1% is 18.4 points behind Qantas mainline and 15.3 points behind Virgin. On the same route, into the same airports, with the same weather. The gap is not about airspace or demand — it is entirely about what happens when Canberra fog grounds an aircraft. Qantas and Virgin have network depth to reprotect passengers and recover rotations. QantasLink on a thin regional rotation does not. If you are flying CBR–SYD for anything that matters — a parliamentary appearance, a connecting international, a same-day return — the airline choice is not a preference question. Qantas mainline or Virgin, full stop. The 6.2% network-leading cancellation rate means the question of what your airline does when your flight doesn't operate is not hypothetical. It will be relevant to a meaningful share of travellers on this route every year.