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From now until the end of the month, BA is offering a free return ticket to London with every summer economy seat sold.

That means anyone booking a seat for travel between June 22 and September 30 will get another ticket for use between November 1 and March 31 next year, apart from a festive period blackout.

A special summer fare of $849 midweek and $899 weekends also applies.

The offer is only eligible for fares to London and applies only to new bookings. In addition, the free winter ticket cannot be used between December 15 and January 15.

British Airways at 1-800-Airways.