The operator has canceled all trips up to and including May 14 due to the ongoing coronavirus pandemic.
Her Marella cruises were all abandoned until at least June.
Their new TUI river cruise, to be launched last April, will now begin in November.
However, it is unclear whether the company will resume flights after the proposed date of May 2020.
The company now offers customers the option to rebook their trip – but did not mention refunds.
A spokesperson said, “We are constantly monitoring the situation and will start going on vacation as soon as we can.”
“Right now, no one can accurately predict when this will happen. For the time being, we will be keeping a close eye on our schedule and will continue to modify and adapt the schedules according to the latest global travel tips. ”
She added that customers whose reservations had been canceled “will be able to change their vacation to any other TUI vacation package on sale” through its website.
However, they did not say that consumers would be entitled to a refund due to the cancellations.
He comes after the Foreign Office and the Commonwealth Office of the United Kingdom have updated his advice to extend his warning against all but essential travel.
Originally, the travel restriction applied for 30 days from March 17, but now the FCO has extended its advice to “indefinitely” as the coronavirus pandemic continues to unfold.
A statement on Tui’s website says, “Due to the current situation regarding COVID-19, the Department of Foreign and Commonwealth Affairs has advised against all but essential travel until April 16, 2020.
“Unfortunately, this means that we can no longer offer TUI vacations or Marella Cruises departing between March 17 and April 16, 2020.
“If you are a Marella Cruises or TUI River Cruises customer and have been told that your navigation has been canceled, we will contact you to discuss your options. “
The firm also asks customers not to call them and instead waits for a call from one of their representatives: “We are working as quickly as possible to contact all the people concerned, prioritizing customers who must travel before April 16 2020.
“So for now, we ask you not to call us. We really appreciate your patience. “
It comes after travel company Jet2.com and Jet2 Holidays announced that they would resume service in June.
The company has announced that it will cancel future reservations, but has announced that it will resume flights from June 17.
Meanwhile, travel industry experts are calling on the government to lift the 14-day refund policy on reservations during a pandemic.
To help travel businesses during the crisis, they want the government to authorize credit notes instead of cash refunds to allow customers to book at a later date.