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

Return flights

13 Apr - 24 Apr	Aer Lingus
12 Apr - 24 Apr	Aer Lingus
14 Apr - 28 Apr	Aer Lingus
25 Apr - 11 May	Scandinavian Airlines
15 Apr - 26 Apr	Aer Lingus
11 Apr - 24 Apr	Aer Lingus
11 Apr - 23 Apr	Aer Lingus
13 Apr - 24 Apr	British Airways	direct
12 Apr - 24 Apr	British Airways	direct
14 Apr - 28 Apr	British Airways	direct
03 Apr - 09 Apr	United
25 Apr - 11 May	British Airways	direct

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 526€

Return flights