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

Return flights

12 May - 26 May	TAP
14 May - 19 May	TAP
01 May - 13 May	TAP
05 May - 26 May	TAP
14 May - 26 May	TAP
01 May - 12 May	TAP
12 May - 22 May	Delta
26 May - 09 Jun	Virgin Atlantic	direct
12 May - 22 May	British Airways	direct
22 May - 25 May	Virgin Atlantic
16 May - 04 Jun	Air Canada
17 May - 27 May	Air Canada
13 May - 11 Jun	Aer Lingus
16 May - 04 Jun	Lufthansa	direct
29 May - 09 Jun	Scandinavian Airlines
13 May - 11 Jun	Finnair	direct
24 May - 07 Jun	WestJet
30 May - 10 Jun	WestJet
23 May - 06 Jun	TAP
26 May - 15 Jun	Aer Lingus

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 418€

Return flights