Price difference on Matrix ITA and Google Flights

Price difference on Matrix ITA and Google Flights - Side view of crop concentrated female customer putting on eyeglasses for improving eyesight while choosing rim in shop

While checking for a flight at Matrix, I got the following price,

http://matrix.itasoftware.com/#view-details:research=LHELON-LONLHE;solution=03gZAa16LIJDMteAykMJSHV/fMeQKy66yx6TmRFQ9x40TT001

For the same flight on Google and the airline website itself, the reported price is about $300 higher.

https://www.google.com/flights/?f=0#search;f=LHE;t=LHR,LGW,STN,LTN,LCY,SEN,QQS;d=2017-07-23;r=2017-08-15;sel=LHEJED0SV735-JEDLHR1SV113,LHRRUH0SV122-RUHLHE1SV732

Why is such a difference present and if I am to believe Google Flights' prices since it matches the airline itself, then what's the use of MATRIX at all?






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Price difference on Matrix ITA and Google Flights - Collection of eyeglasses on shelves in store
Price difference on Matrix ITA and Google Flights - Assorted fresh pepper and cucumbers at counter with fresh gerberas and sunflowers selling at bazaar
Price difference on Matrix ITA and Google Flights - Radish with fennel in supermarket





My Guide to Matrix ITA by Google




Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Ksenia Chernaya, Ksenia Chernaya, Maria Orlova, Michael Burrows