The airline said in a statement on Thursday that its website and app were compromised from August 21 until 9:45 p.m. on Wednesday.
Hackers have stolen the data of 380,000 customers including names, addresses, phone number, and payment information from the British Airways website.
British Airways today announced it was the victim of a data breach in which the "personal and financial details" of customers were stolen.
The airline had launched an investigation and was communicating with affected customers.
Chief executive Alex Cruz says the company is "100% committed" to compensating customers who have had financial information stolen.
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Anyone who booked flights during the exposed time will be contacted directly by the airline, which will include information on the breach and advice on moving forward.
Shares in International Airlines Group have dramatically plummeted by more than 3% at opening following the massive data breach.
BA insists its buggered systems have been patched and its website is now working normally. "We take the protection of our customers' data very seriously".
Mat Thomas said he placed a booking on 27 August, but had not been contacted about the breach.
"Called bank and had to cancel both mine and my wife's card".
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"Terrible handling of the situation as I've still not received an email from BA!" Customers are encouraged to reset their BA.com password.
Which? said it was "vital" BA moved quickly to ensure affected customers get clear information and what steps they need to take to protect themselves.
In May 2017, serious problems with British Airways' IT systems led to thousands of passengers having their plans disrupted, after all flights from Heathrow and Gatwick were cancelled.
"One will be figuring out which cards have been compromised and alerting victims, whilst the other will be trying to abuse them while they are still fresh".
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