The tour operator had previously cancelled all trips until June 11 but it has now been forced to further cancel trips due to the UK’s ongoing travel restrictions.
TUI said in a statement that it has extended the suspension of holidays “due to the ongoing travel restrictions”.
A statement on the website states: “Due to the ongoing situation regarding COVID-19, the Foreign and Commonwealth Office have advised against all but essential travel.
“If your holiday falls into one of the below categories, we’re really sorry to say that it has been cancelled.
READ MORE: TUI refund: Can I get my money back if my holiday has been cancelled?
Police may or may not then check on the travellers to make sure they are following the new rules.
Anyone caught breaking the rules could face a fine of up to £1,000.
Home Secretary Priti Patel announced last week that the rules will be implemented from June 8.
This will also apply to Britons arriving back from holiday.
British holidaymakers could potentially have to take off three to five weeks off work for a one week holiday.
The quarantine rules will be reviewed every three weeks, meaning that they could potentially end at the end of June.
However, dozens of travel company bosses called on Ms Patel today to scrap the new rules.
In fact, a letter which was signed by more than 70 travel bosses warns that the new rules will “deter foreign visitors from travelling to the UK” and “deter UK visitors from going abroad”.
TUI is now offering its customers who delay their trips credit of up to 20 percent on a future holiday.
Customers can also get a cash refund on the company’s website.
The latest news from TUI has left Twitter users with holidays booked with the company outraged.
One user tweeted: “Are TUI having a laugh, just been told that they have cancelled holiday and I needed to call them, after 28 attempts I have now been on hold for two hours and 47 mins, what are they playing at I was just going to change my dates, but I am that fed up I will now get a refund.”
Another said: “Absolutely fuming, it’s ridiculous.”