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

Return flights

24 Apr - 04 May	TAP
18 Apr - 27 Apr	TAP
23 Apr - 27 Apr	TAP
16 Apr - 29 Apr	TAP
16 Apr - 02 May	TAP
17 Apr - 01 May	TAP
28 Apr - 04 May	TAP
20 Apr - 28 Apr	Scandinavian Airlines
17 Apr - 28 Apr	TAP
16 Apr - 27 Apr	TAP
30 Apr - 05 May	TAP
14 Apr - 05 May	TAP
26 Apr - 07 May	Scandinavian Airlines
06 Apr - 13 Apr	Scandinavian Airlines
09 Apr - 23 Apr	Scandinavian Airlines
01 Apr - 09 Apr	Air Canada
08 Apr - 24 Apr	Air Canada
15 Apr - 01 May	Aer Lingus
23 Apr - 01 May	Air Canada
23 Apr - 05 May	Air Canada

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

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 April from $470

Return flights