Forwardkeys, which monitors future travel patterns by analysing 14 million reservation transactions each day, said net bookings, which take into account both daily bookings and cancellations, were 101% down on the same period last year.

New reservations have also proven slow to return, it said.

The cancellations were primarily from businesses and event travellers who were on immediate departures, with the biggest drops in bookings from the US, China, Spain and Italy.

The number of cancellations now appear to be levelling off, however Forwardkeys said there had been a noticeable dip the day prior to the start of the international climate talks, COP21, in Paris, which begins on November 30.

Overall the number of cancellations from November 14-21 increased 21% compared with same period last year, although they have now returned to normal levels.

The number of new bookings remains 27% down, compared with the same dates last year.

Accumulated bookings for the Christmas holiday period compared with last year also plateaued immediately after the 13 November attacks, with the number of bookings for travel during this period now 13% down. Before the terror attacks, they were just 2% behind.

Olivier Jager, co-founder and chief executive of ForwardKeys said: “The clear picture to emerge from our data is that there were dramatic last-minute cancellations of immediate travel plans, predominantly among business travellers, following the attacks.  

“The tragic events in Paris are having a strong impact on travel to the city and our data shows that this is continuing in the run-up to the normally busy Christmas period. The cancellation period has ended, meaning that the storm is behind us, but booking trends are not yet showing signs of recovery.”