UK visitors are now able to travel to the US for the first time in nearly two years.
The border reopened at 05:01 GMT and the first flights took off from Heathrow at 08:51. All UK visitors over 18 have to provide proof of vaccination to enter the US.
American travellers have been able to travel to the UK since 28 July.
Transport Secretary Grant Shapps has called this a "significant moment" for UK-US travel.
Transatlantic flights, he added, are "at the heart of UK aviation".
In addition to the UK, the travel ban is being lifted for people from Brazil, China, India, Ireland, South Africa, Iran and the Schengen countries - a group of 26 European nations.
Until Monday, only US citizens, residents and a small selection of other exempt groups have been allowed entry to the US from the UK.
The new rules apply to all individuals that have received vaccines approved by the US Food and Drug Administration (FDA) and vaccines Listed for Emergency Use (EUL) by the World Health Organization.
The White House's assistant press secretary, Kevin Munoz, confirmed on 15 October that double vaccinated foreign nationals would be able to visit the US from 8 November.
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