The British government has asked the Civil Aviation Authority to coordinate flights for stranded passengers for no additional charge.
The airline has been placed into administration and will bring Monarch customers back the United Kingdom over the next fortnight over specially chartered planes.
Flights are being arranged for around 110,000 Monarch passengers stranded overseas, and more than 300,000 future bookings with the company have been cancelled. You can also message the Guardian on WhatsApp by adding the contact +44 (0) 7867825056.
The firm, which has its headquarters at Luton Airport in London, employs around 2,750 people and is the biggest United Kingdom airline to ever cease trading. Coupled with this, the Civil Aviation Authority reported that the government asked it to rent more than 30 aircraft to United Kingdom to return back more than 110,000 Monarch customers now overseas.
"Their hard work has been undone by a government seemingly content to sit on its hands and allow one of the UK's oldest airlines go into administration", said Oliver Richardson, a Unite national officer.
Monarch had been given until Sunday evening to renew its ATOL licence which allows it to operate package holidays, but failed to do so.
The Civil Aviation Authority, (CAA) the UK's independent aviation regulator, has said this is the biggest ever United Kingdom airline failure.
And it understood that Monarch passengers who were due to fly to the United Kingdom from Gibraltar will also be transferred to Malaga airport.
"We know that Monarch's decision to stop trading will be very distressing for all of its customers and employees", Andrew Haines, Chief Executive of the CAA, was quoted as saying by Telegraph.
All future Monarch flights have been cancelled, affecting an estimated 300,000 bookings, and an estimated 110,000 holidaymakers who flew away with Monarch have been left stranded overseas.
A dedicated website monarch.caa.co.uk has been set up for customers affected by the company's collapse.
The CAA said on Twitter: "Some disruption is inevitable in these extraordinary circumstances; please bear with us as we do our very best to help".
But for the next two weeks, Monarch flights to the United Kingdom will be replaced by alternative flights organized by the country's Civil Aviation Authority in order to bring travelers home.
These flights will be free for passengers who were booked to fly Monarch.