AirHint found the following cheapest return flights from San Francisco (SFO) to London (LHR) in May 2026 (see full year).

Return flights

01 May - 15 May	United
07 May - 10 May	Scandinavian Airlines
01 May - 15 May	British Airways	direct
07 May - 10 May	Delta	direct
14 May - 21 May	Virgin Atlantic	direct
01 May - 01 Jun	United
15 May - 24 May	British Airways	direct
16 May - 30 May	United	direct
27 May - 07 Jun	SWISS
29 May - 12 Jun	Air Canada
30 May - 13 Jun	TAP
01 May - 01 Jun	British Airways	direct
29 May - 12 Jun	British Airways	direct
27 May - 07 Jun	British Airways	direct

Also check the deals for one-way flights from San Francisco to London in May.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from San Francisco to London in May from 572€

Return flights