PM Hasina is scheduled to leave Dhaka for London on 15 September. She is likely to leave for New York from London on 19 September after attending the funeral, the source told UNB.
World leaders and dignitaries have been paying tributes to the Queen, who died on Thursday at the age of 96.
They remembered her deep sense of duty and her resilience, as well as the Queen's sense of humour and kindness.
Hasina will return home on 4 October after attending the 77th UN General Assembly in New York followed by a visit to Washington DC.
Foreign minister AK Abdul Momen and state minister for foreign affairs Md Shahriar Alam will be accompanying the PM during her upcoming visits to London, New York and Washington, an official at the foreign affairs ministry told UNB.
Momen was not part of the PM's entourage during her just-concluded state visit to India (5-8 September), due to "health reasons".
The seventy-seventh session of the UN General Assembly opens on 13 September with the theme, "A watershed moment: transformative solutions to interlocking challenges."
The theme stems from the recognition that the world is at a critical moment in the history of the United Nations due to complex and interconnected crises, including the Covid-19 pandemic, the war in Ukraine, humanitarian challenges of unprecedented nature, a tipping point in climate change as well as growing concerns about threats to the global economy.
At the UN general assembly heads of states and governments will explore solutions to the outstanding global challenges on 20 September.
This year's general debate, which runs through 26 September, is expected to be fully in-person.