Jet2.com and Ryanair were among those to urge passengers travelling on Wednesday (20 November) to check their arrangements.
Met Office yellow warnings for snow and ice were issued for large parts of the UK on Tuesday (19 November), with many remaining in place on Wednesday.
These cover the East Midlands, East of England, London and the South East, the North East, the North West, Northern Ireland, Scotland, the South West, Wales, the West Midlands, and Yorkshire and Humber.
It comes after temperatures fell below freezing in parts of the country on Tuesday, with some areas experiencing their first snowfall.
