Airports around the country, and Heathrow in particular, were getting back to normal on Sunday after days of disruption caused by heavy fog.
British Airways domestic flights at Heathrow resumed on Saturday
Here is a round-up of the latest airport, road, rail and Tube travel situation.
British Airways customers should contact 0800 727 800
or check the www.britishairways.com
website to see if their flight is still operating
There is regular travel information on BBC News 24, BBC Radio Five Live and the BBC's local radio and regional TV news.
This website will have updated advice and there are links to the BBC's travel and weather web sites below.
There was a vastly improved service at Heathrow on Sunday after severe fog cleared.
As a result, British Airways expects all its scheduled flights to run on Christmas Eve.
Airport operator BAA said it hoped a full service of flights would operate out of all its airports on Sunday.
Glasgow, Edinburgh and Aberdeen flights are getting back to normal, although there had been a few delays on Saturday.
BAA said passengers were still advised to check with their airline about their flight before leaving for the airport.
At Southampton flights are getting back to normal, although there had been a few delays on Saturday.
BAA said passengers are asked to check-in as normal and should contact their airlines directly if they should have any concerns.
Bristol International outbound flights are operating but subject to delays and there are some delays to incoming services.
An RAC spokesman said the worst of the Christmas rush was now over and that it expected up to 10 million cars to be on the roads on Christmas Eve, mostly between 1000 and 1600 GMT.
The spokesman added that city centres could get busy as people carried out last-minute shopping.
The Highways Agency has suspended roadworks over the festive period on 26 sites from 0600 GMT on Friday 22 December until 0100 GMT on 2 January.
Some 26 sets of roadworks, covering about 56 miles of road, will remain in place on some busy routes, including the M25.
Eurostar services from Waterloo and Ashford have very limited ticket availability.
Most of the rail network will be shut from late Christmas Eve until 0600 GMT on 27 December.
Gatwick Express and Heathrow Express services will be running on Christmas Day and Boxing Day. Network Rail said about a third of all operators will also be running some services on 26 December.
A strike on Central Trains by the RMT union means there will be no services on 24 December and a reduced service on 31 December and 1 January.
On Midland Mainline, the RMT has called off strike action on the same dates. A normal planned service will operate on these days.
There will be no Tube service on Christmas Day. A reduced service will run on 26 December.