British Airways will delay transferring more of its long-haul services to Terminal 5 until the end of the summer after moving one-quarter of flights from Terminal 4 on June 5.

The carrier has decided to avoid the peak holiday period and the transfer to the new terminal will now be completed in two stages – on September 17 and at the end of October.

Chief executive Willie Walsh had originally intended to move long-haul services on a single day at the end of April.

In a joint statement with airport operator BAA, BA said Terminal 5 was working well following its troubled opening on March 27. News of the move has been delayed by BAA’s need to coordinate with other airlines, some of which are demanding compensation.

The first phase of the move of BA long-haul flights next week will include services to New York.