After greeting the 178 passengers and 11 crew on the first flight from Chicago, Heathrow's development director at Heathrow ,John Holland-Kaye, said he was delighted with the opening.
He said: "It's gone as well as we could have hoped for. I could not be more pleased. Our months of planning and testing have paid off and I want to thank the many thousands of people who have made this opening possible."
But there were some bits of bad news. Through no fault of T2, a United plane from Chicago due to arrive at 8.35am was delayed for nearly three hours. Also, Heathrow arriving and departing passengers were having to contend with a strike by RMT union members on the Heathrow Express rail link.
One of the first workers at the new terminal today was flower-stall operator Mariana Irigui, from Ealing, west London. She said: "The new terminal is beautiful. It's bright and airy."
More than 180 trials for T2 have taken place over the last six months involving 14,000 volunteers. As many as 100,000 bags have already passed through the T2 baggage system, with peak loads tested at 4,000 bags per hour compared with an expected peak of 2,500 bags