BA open jaw ticket rules

[r6mile]

Hello – I have just booked a one way LGW-BRI ticket for the summer using a couple 2*1 vouchers. Return is via Ryanair as no availability on convenient dates or times.

There is a possibility we may go to Madrid over Christmas. My question is about whether MAD-London would be allowable to book as the return leg of the original LGW-BRI ticket, and therefore take advantage of the companion voucher? I understand the criteria is that the distance between ie BRI and MAD must be smaller than that between LGW and BRI. I have looked on a couple of websites that measure distance between airports and weirdly its exactly the same – 1062 miles- for both legs.

Do you have any thoughts as to whether this would be allowed? How does BA measure the distances?

[JDB]

The IATA rule is that the ‘surface’ sector must not be greater than either flight and I think Madrid > London is shorter than Madrid > Bari?

[r6mile]

Thank you, yes LGW-BRI is 1062 miles, BRI-MAD is 1062 miles, and MAD-LGW is 754 miles so I guess this is not allowable.