Two international travellers who flew to Melbourne instead of going into hotel quarantine in New South Wales return a second negative result for COVID-19, meaning their close contacts can now end their self-isolation.

The DHHS sends out a public health alert after two international travellers caught a second flight from Sydney to Melbourne without undergoing mandatory quarantine in NSW.

NSW Police apologise after an officer incorrectly thought two German nationals had an exemption to board a flight to Melbourne without undergoing hotel quarantine in Sydney.

The first international flights have landed in Melbourne as Victoria restarts its coronavirus hotel quarantine program.

Two overseas travellers failing to quarantine in Sydney before travelling to Melbourne has prompted a directive to others on their flight to quarantine at home.

Federal Tourism Minister Simon Birmingham says "further tightening is required in NSW" after two dual Australian-German citizens were allowed to board a flight to Melbourne without undergoing hotel quarantine in Sydney.