http://matrix.itasoftware.com

From: YYC (or any airport within 275 miles)
To: HKG (or any airport within 300 miles)
September 1 (or the next day) to September 8 (or the next day)

If I run this query, the cheapest flight is YLW to HKG for $628.


Now, if I change the above to...

From: YYC (or any airport within 275 miles)
To: QVR;HKG (or any airport within 300 miles)
September 1 (or the next day) to September 8 (or the next day)

So basically all I've done is add the airport QVR.

Now the cheapest flight showing up is $692, from YYC to GRU.

It seems to completely miss the YLW to HKG flight for $628.


Just wondering if anyone knew why that would be?