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Skyscanner are showing cheap indirect flights LHR- SFO from £261 with TAP (Air Portugal) which can also include a few days stop off in Lisbon. Booking is with Gotogate but the same flight is £320 booked direct with the airline

London
San Francisco
Wed, 21 Jul
Discount
Flight information numberTP1363 Flight information numberTP0237
San Francisco
London
Wed, 04 Aug
Discount
Flight information numberTP0236 Flight information numberTP1368
1 Passenger
1 Adult
Baggage Allowance
Fare Conditions
Final Price
320.97 GBP