Excuse this if I haven't thought of an obvious answer but I've been checking prices of flights to San Francisco in April 2017. The searches I did were mainly from London but then when I checked nationwide a flight came up from Edinburgh which was nearly £300 cheaper for 2 travellers but with a stop over on both the outward and return journeys in London. British Airways from Edinburgh to Heathrow and then Virgin from Heathrow to San Francisco. On the return it's San Francisco to London City with Virgin and then on to Edinburgh with British Airways again. What's to stop you joining the outward trip at Heathrow and then ending your journey back at London City?
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At least that is what has happened to me in the past.
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Virgin ticket, BA to London, Virgin to SF, Delta back via JFK
they were way cheaper than any other, under £500 compared to £700
good flight times and connections in May this was, with short notice
Then it was £800 for August, now about £1000
I remember a case involving day return tickets on the Eurotunnel where people were buying returns with the intention of only using the outbound trip. I guess it is a marketing/promotions versus actual cost thing. If I recall correctly Eurotunnel tried to charge people who didn't use the day return part of the ticket, but don't quote me!