Febyanti Herewila-Chan married the convicted drug smuggler in Indonesia two days before his April 29 execution.
In her final letter to her new husband, Ms Herewila-Chan said she told Chan to keep singing as he was lead to the execution field, and that when he got to heaven he could ask Jesus to send him back to her.
"If you're happy to stay there (in heaven), don't worry about me," she read to the crowd of more than a thousand mourners at the Hillsong megachurch in Baulkham Hills in Sydney's northwest.
Ms Herewila-Chan also read out one of the last letters written to her by Chan before his execution.
"You will need to continue with the visions on the island. Never forget the people there. I have found love for them through you. Darling, continue to fight for the rights of injustice in this country."
'Now, little brother I look up to you'
Andrew Chan's brother, Michael, Michael was emotional as he delivered a eulogy in front of more than a thousand mourners at his brother's funeral.
He reflected on the changes in his brother during his 10 years in an Indonesian jail, and promised to look after his "new sister" Febyanti Herewila-Chan, who married the drug smuggler two days before his April 29 execution.
"Andrew showed me that everyone can change, and change for the better," Michael said.
"Andrew, you used to say that you looked up to me. Now, little brother I look up to you."
Earlier, the Chan's family friend Salvation Army Major David Soper acknowledged the presence of the Sukumaran family at the service at Hillsong Church in Baulkham Hills in Sydney's northwest.
Chan and fellow drug smuggler Myuran Sukumaran faced the firing squad in Indonesia together with six other prisoners.
Up to 1600 mourners inside the church stood as one as pallbearers carried in Chan's coffin at the start of the service.
There were cries of "Amen" from the crowds as Major Soper said of Chan: "He is with his maker".
A pastor who was with Chan and fellow smuggler Myuran Sukumaran on the Indonesian prison island until they faced the firing squad, says the Chan family had wanted a small service but that the public response to the executions had changed that.
"I think what we've got to remember is that the families wanted this to be a private occasion," said Pastor Christie Buckingham on Friday.
Pastor Buckingham said the outpouring of grief by the public since the April 29 executions made it clear that a smaller church could not have been used for the service.
"We had no idea how many people were going to be here," she told the Seven Network.
It will include a reflection Chan wrote about his life before he was executed on April 29.
For those planning to buy flowers, his family asked that people instead adopt "the pay it forward attitude and bless someone".
"We'd love to see this money used to help others or be donated to a worthy cause," Andrew's brother Michael said in a statement.
The Chans have not authorised any website asking for donations, so have warned people to be wary of fraudulent sites.
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