Islanders can also expect a number of other routes to be opened up in the near future, both to the UK and to mainland Europe.
Around 90,000 passengers a year used the Heathrow link before British Airways axed it several years go.
Airport director Julian Green said that traffic had increased from all the London airports this year, including Gatwick, Luton and London City.
Other routes gaining year on year were Cardiff, served by Thomsonfly and BMI, and Doncaster.
But some routes, including Southampton, were down on the year.
