Originally Posted by Cymro

I don't know for certain, and it may well depend on whether SFO-LHR is a return leg or an outbound, but in general I would expect SFO-LHR to be much more than SFO-LHR-LIS.

That said, the cost of a walk-up one way is likely to be less than the change fee of sticking the two tickets together.

So I'd self-insure, through-check the bags, and book the trip to LIS as two one-ways so that if I did misconnect and BA didn't look after me (fairly unlikely all in) I'd only have to worry about the outbound.

Originally Posted by chris1979

Is that really the case?

I recently had a case of a delayed BA flight from SIN to SYD threatening my QF SYD WLG connection. Now, i was being pro-active and asking BA to look at moving me to a later flight. That would have initially incurred extra cost which both QF (in SIN) and BA (in SIN) told me I'd have to pay.

eventually, GGL agreed to cover the costs though as it turns out, both QF and BA in SIN overestimated time it would take to connect and I did make it to my original flight running.

I guess I don't know what QF would have said in SYD if I had explained things to them there but as said, without GGL intervention (not that I needed it in the end), both BA and QF in SIN were telling me that I needed to cover the cost.