Some flights have started up again, but Airport officials have warned passengers should expect lengthy delays.
Both departures and arrivals have been affected at the Sunshine Coast Airport.
A tweet was issued by Air Services Australia saying they are working to fix the issue and continue to control traffic safely.
Virgin Australia, Qantas and Jetstar have confirmed the problem is affecting flights, with all airlines asking passengers to check websites and urging travellers to be patient.
"I already knew about this from the news but my flight still said it was on time until 20 minutes ago", Ms Robbers said.
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Delays from the airport range from half an hour to nearly three hours.
"Sydney does seem to impact the entire system".
All flights at Sydney Airport have been grounded following a huge power outage on the first day of school holidays.
"It's hard to say, unfortunately", the spokeswoman said.
FLIGHTS into and out of Wellcamp Airport are unaffected by the current fault that has grounded flights at Sydney airport.