Airlines have issued a bulletin warning that travellers may be forced to wait several hours before they get through immigration, operated by the UK Border Agency.
It has been reported the disruption is being caused by lower staffing levels at the airport on one of its busiest days of the year.
Last night, congestion was already building up at Terminal 5, and it was said some incoming flights may have to be diverted to other airports.
British Airways said it had raised the issue with authorities at the airport in a bid to ease conditions for its passengers.
A BA spokeswoman said: "We are speaking to Heathrow Airport and UK Border Agency to understand why the immigration area in Terminal 5 is congested.
"We are doing all we can to assist our customers and are sorry that they are being affected by this issue, which is regrettably beyond our control."
A spokesman for Heathrow added: "No one has notified us of a staff shortage. However it is up to UK Border Agency to staff the border appropriately."
The UK Border Agency released a statement saying: "There will be a significant number of passengers coming through UK border controls and we have organised extra resources to ensure that we have sufficient staff to process passengers as quickly as possible, while maintaining border security."
It added that it was expecting "an exceptionally busy weekend as usual for the end of February half-term".

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