SYDNEY — More Australian flights were canceled Tuesday because of ash from a Chilean volcano, this time out of a midsize southern airport, as airlines scrambled to fly out thousands of passengers who had been stranded for two days in Melbourne.

National carrier Qantas and budget airline Jetstar said they planned to add capacity to and from Melbourne, Australia’s second-largest city, and hoped to get all passengers in the air by the end of the day.

More than 60,000 passengers have been stranded by the disruptions, which came amid a three-day holiday weekend in Australia. It was unclear how many people were still stranded in Melbourne as flights resumed there.

Meanwhile, about two dozen flights into and out of the southern city of Adelaide were canceled Tuesday, though Qantas and Jetstar said they would reassess that decision later in the day.

The airlines kept flights to the island state of Tasmania and New Zealand grounded, as they have since Sunday.

Ash has moved across the Pacific from Chile, where it has been spewing from the Cordon Caulle volcano since June 4.