No mention was made about what was taken. A BA spokesperson confirmed to Newsbeat that the claims were being investigated.
The 31-year old TV reality star Tweeted: "Very disappointed in British Airways for opening my luggage and taking some special items of mine.
"Some things are sentimental and not replaceable.
"What happened to the days when you could lock your bags! We need to get back to that. There's no sense of security and no trust!"
Kardashian was in the UK as part of a promotional tour for her new perfume, before she left to make an appearance at the Cannes Film Festival.
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