Virgin check-in issues resolved

Virgin Australia has resolved its technical issue which took its computer check-in system offline, but has warned passengers could still face delays.

Delays are expected for Virgin Australia passengers after its computer check-in system went offline. (AAP)

Virgin Australia has fixed a technical issue which took down its check-in computer system for nearly three hours.

The disruption was due to an Optus technical issue which delayed flights from about 2pm as passengers had to be manually checked in, the airline said.

The Adelaide Crows, who were due to fly home from Melbourne after Saturday's defeat in the AFL grand final, were among those affected.

However, about 4.45pm on Sunday, Virgin Australia confirmed the issue had been resolved, but warned passengers could still face some delays during the afternoon.

"Our check-in systems are now fully operational after an Optus technical issue was resolved," the airline said in a statement on Sunday.

"We sincerely apologise for any delays and inconvenience this issue has caused our guests."