This question already has an answer here:
I'm planning a trip to South-Korea in April. I was looking at flight ticket prices and found that I can go from Brussels to Seoul (and back) for about 600€. It lands in London however. I then tried to find the same flight but from London (I was expecting I could get the price even more down if I'm not doing BRU-LHR), but no search engine found it and the cheapest was at about 700€.
Here you can see what I'm talking about in action: http://www.skyscanner.net/flights/lhr/icn/140405/140428/airfares-from-london-heathrow-to-seoul-incheon-intl-in-april-2014.html http://www.skyscanner.net/flights/brus/icn/140405/140428/airfares-from-brussels-to-seoul-incheon-intl-in-april-2014.html
It's the same date and everything, and it's much cheaper from Brussels although it lands in London.
Question: This seem really strange. Why does this happen, and is it possible to buy the ticket from Brussels but only get on the plane from London?