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

Return flights

01 Apr - 12 Apr	SWISS
27 Apr - 02 May	Alaska Airlines
23 Apr - 27 Apr	TAP
08 Apr - 02 May	SWISS
03 Apr - 10 Apr	TAP
28 Apr - 08 May	TAP
01 Apr - 10 Apr	Turkish Airlines
02 Apr - 11 Apr	Turkish Airlines
05 Apr - 25 Apr	SWISS
04 Apr - 25 Apr	Turkish Airlines
22 Apr - 16 May	Turkish Airlines
22 Apr - 26 Apr	Turkish Airlines
04 Apr - 11 Apr	Turkish Airlines
05 Apr - 09 Apr	Icelandair

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 $672

Return flights