The Spice Girls broke ticket sales records because fans struggled to secure their place at a show in an online queue of more than 700,000 people.
The band added a series of dates to their reunion tour after fans vent their frustration in a rush for tickets.
The group, which will be back on the road together next year without Victoria Beckham, announced they would play in London, Coventry and Manchester.
The Spice World tour will now begin at the Etihad Stadium in Manchester on May 29, 2019, not June 1, and they will play three dates in the city.
They will play two additional dates at Wembley Stadium in London, with performances on June 13, 14 and 15, and extra dates in Coventry, with further performances at Ricoh Arena on June 4.
Andrew Parsons, managing director at Ticketmaster, said: "Requests for the Spice Girls have come out of the chart. They have destroyed the Ticketmaster UK record which is the busiest sale.
"There are millions of people on our site who are looking for tickets, with queues at one point above 700,000.
"Hundreds of thousands of tickets were sold to happy fans across the country in a few minutes. Congratulations for the girls. From what we see, they can play almost every night for a year. "
Fans struggle to secure tickets to live shows, encouraging Ticketmaster to write on Twitter: "Morning Spice fans! This is a very busy morning and we sell tickets quickly.
"To ensure fair access, some of you may see the queue page, please follow the instructions."
One fan wrote on Twitter: "@TicketmasterUK how should people be able to buy tickets for # SpiceWorld2019 when" something is wrong "continues to run ????? Really ridiculous! "
Others said: "No, @TicketmasterUK, there is no problem with my connection! Your website cannot handle traffic #igiveup Cheers."
Others expressed anger that the ticket had appeared on the resale website. One wrote: "Absolutelyrubbish. Keep being evicted. Somehow this ticket already exists on another site for hundreds already. Not good."
But others said: "@TicketmasterUK Are you kidding me I have been in line since they went on sale, keep getting error messages and people have bought them and put them on the stubhub for some money that is RIDICULOUS. Let's fix it."
However, others celebrated their success, with one fan saying: "GUESS WHO IS GOING THE THE SPICEWORLD2019 FRONT YEAR !!! I really cried. A dream came true."
Others wrote: "Don't believe I have a TICKET !!! So it was very noisy! Ha-Si-Ya HOLD TIGHT !!!! "
Ticketmaster assured fans and urged them not to give up, tweeted: "This site hums and many of you get your @SpiceGirls tickets this morning!
"If you're still in line, don't worry, there are lots of tickets to spin."