Flights between Canberra and Sydney were again over-represented in cancellation rates in November, coming in second worst in the nation and well above industry long term averages.
Department of Infrastructure and Regional Development data showed cancellations were highest on the Dubbo-Sydney route last month, at 5.3 per cent, ahead of Sydney-Canberra at 5.1 per cent and flights between Port Macquarie and Sydney, at 4.9 per cent.
Cancellations for Canberra-Sydney flights hit 4.8 per cent in the period, well above the national cancellation average of 1.4 per cent of all flights.
Customers and Canberra Airport's owners have spoken out at the high rates of cancellations to and from the capital since flights between Canberra and Sydney topped the nation in October at 8.1 per cent.
Last month, the federal government said it wouldn't seek to intervene on the issue, rejecting calls for a national taskforce to address complaints from stranded passengers.
There were 110 cancelled flights in November and at least one Christmas Day service was cancelled from Canberra on Monday.
On time performance for all arrivals into Canberra Airport reached 82.5 per cent in the month, above the national average of 80.2 per cent.
For departures from Canberra, the rate was 83.9 per cent, above the national average of 81.2 per cent.
Cancellations represented 1.8 per cent of all scheduled flights, on par with November 2016 figures but higher than long term cancellation averages of 1.4 per cent.
QantasLink recorded the highest cancellation rate in the month, at 3.3 per cent nationally, followed by Virgin Australia regional airlines at 3 per cent.
The rate for Qantas and QantasLink flights departing Canberra was 3.6 per cent in the month, down from 7.2% in October.
Flights for the airlines into Canberra also fell in November, from 6.7 per cent in October to 4.1 per cent last month.
Cancellations and delays on Canberra flights are being blamed on issues related to availability aircraft and crew, with airlines pointing to flow on effects from cancellations on other parts of their networks.
Qantas has adjusted domestic and regional schedules to help improve reliability, including efforts to consolidate flights during non-peak travel periods and using larger aircraft on key routes to maintain capacity.
Canberra passengers are seeing more of the larger 737 aircraft, replacing some smaller 717 aircraft and adding about 60 seats on every flight.
QantasLink chief operating officer Jenny Chamberlain said improving the reliability of the airline's network had been given "the highest priority".
"Cancellations on the Canberra route improved significantly in November in comparison to the previous month," she said.
"We're seeing improvements as a result of the recent adjustments we've made to our network and schedule, and our teams remain focused on ensuring this trend continues."
Former Infrastructure Minister Darren Chester rejected calls for Canberra Airport boss Stephen Byron for federal intervention, including by the Australian Competition and Consumer Commission.