An extended ceasefire in the African nation ends on April 30 and the federal government is unable to guarantee flights out afterwards.
Watts said it was a “dangerous and volatile” situation in Sudan at the moment.
“Our message to any Australians leaving the country is clear, this ceasefire is your opportunity.
“If it is safe for you to get to the Wadi Sayyidna airport, leave now.
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“We can not guarantee there will be flights leaving after the conclusion of this ceasefire on April 30.
“There are plenty of seats for Australians leaving from that airfield and you will be met with Australian consular officials to help assist you with your journey on to Australia.”
He said DFAT officials had been working “around the clock” to secure seats on flights operated by partner countries exiting Sudan.
“We are also securing seats on road convoys leaving the country.”