Heathrow Airport is providing VisitBritain with more than £4 million worth of adverting space this year, and the first campaigns will show the West Country is ready to welcome the world.
Glastonbury, Cornwall and Devon will feature during the first three months, signalling that the areas are open for business.
The campaign images will be on display from today across 134 digital screens in all terminals at Heathrow, illustrating the range and variety of Britain's natural beauty. An aerial shot of Glastonbury Tor will show millions of visitors from around the world that Somerset has "stunning views in every direction".
Somerset tourism leaders, MPs and councils have expressed concern that international news coverage of the floods on the Somerset Levels gave the wrong impression of a county where tourism is vital.
Around 13 million passengers a year use Heathrow as their gateway to Britain. The partnership is designed to inspire passengers to explore further afield, and visit regions, and other UK nations.
Sandie Dawe, chief executive of VisitBritain, said: "Our aim is to inspire visitors to explore more of the country during their visits to Britain. We're really grateful to Heathrow for this wonderful gift of advertising space."
John Turner, CEO of Visit Somerset, added: "The flooding's been a significant setback but only two per cent of 1,600 square miles of the county has actually been affected."
Secretary of State for Culture, Media and Sport, Maria Miller, said: "It's right that those areas hit hardest by the floods will be the first destinations to be promoted."