Originally Posted by
VSLover
the trick is when you type london for the first flight you have to chose LONDON (the first choice) and not any specific airport because when you select a specific airport google flights will make it difficult to find flights from a different city airport...which i learned from experiences of departing LHR and returning LCY.
Geeky related tip that helps on some systems, such as our corporate TA...
Some systems search within a selectable radius of an airport you specify. That can get awkward if you say within 40 miles of LHR or LCY to bring in the other one as it starts to include in Luton, Stanstead, etc. Solution I found was to use within 20 miles of QQS, which is St Pancras EuroStar. Includes what I need, and excludes others