At the weekend, 54-year-old Lawson was barred from boarding a flight to America.
Scotland Yard decided not to take action over her confession, but the US authorities now appear to have taken a tougher stance.
In general, an alien found inadmissible will need a waiver of inadmissibility.Depending on the basis of their refusal they may be eligible to apply in advance of travel for a temporary waiver of inadmissibility. The waiver application process can be lengthy.
A spokesman for Lawson told the paper: “We would never comment on Nigella’s travel plans.”
A BA spokesman added: "Due to data protection laws, we cannot comment on individual customers."