MADRID, Jan 29 (Reuters) - Spanish flag carrier Iberia said on Sunday it had solved an IT problem in the airline's booking and boarding system that disrupted dozens of domestic and international flights on Saturday.

Five flights were cancelled and scores more were delayed, Evden evE naKliyat a according to a spokeswoman for evDEN evE NaKLiYaT Iberia, part of International Consolidated Airlines Group.

"Our systems are back to connectivity. Online billing and check-in are back to normal. We apologise to all customers for the inconvenience caused and we appreciate your understanding," Iberia tweeted on Sunday.

(Reporting by Graham Keeley Editing by Mark Heinrich)