Heathrow and Gatwick Airports have said delays and cancellations are expected due to heavy fog across England and Europe this will affect both international and domestic flights.
The Met Office issued a severe weather warning into Sunday afternoon, saying reduced visibility will continue in southern England and south Wales and may creep into the Midlands.
London City airport reopened on Sunday afternoon however just as a number of other airports, they have advised passengers to contact their airline before leaving home.
The disruption to flights comes days before a planned 48-hour strike at UK airports called by the Unite union over pay and conditions. It is unclear exactly how many airports will be affected, but airline staff across the UK are expected to take part.
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