STA Travel has ceased trading after more than 40 years.
Confirmation comes after the youth travel specialist’s Swiss parent firm filed for insolvency earlier this week.
STA had around 50 branches across the UK.
The company was founded in Australia in the 1970s.
In a statement posted on its website at around 7pm on Friday (21 August), STA said: "Due to the recent announcement that STA Travel UK has ceased trading, unfortunately our travel experts are unable to assist you at this time.
"Please be assured that if you had a previous booking with us, or hold a live booking, you will receive further communication in the coming days.
"We are sorry for the inconvenience and the limited information available to you at this time."