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

Return flights

06 Mar - 26 Mar	SWISS
01 Mar - 21 Mar	SWISS
07 Mar - 21 Mar	SWISS
01 Mar - 15 Mar	SWISS
19 Mar - 29 Mar	SWISS
02 Mar - 15 Mar	SWISS
05 Mar - 15 Mar	SWISS
07 Mar - 17 Mar	SWISS
10 Mar - 17 Mar	SWISS
16 Mar - 25 Mar	SWISS
14 Mar - 03 Apr	Aer Lingus
19 Mar - 02 Apr	Air Canada
25 Mar - 15 Apr	Aer Lingus
19 Mar - 02 Apr	British Airways	direct
14 Mar - 03 Apr	British Airways	direct
25 Mar - 03 Apr	Aer Lingus
25 Mar - 01 Apr	Aer Lingus
26 Mar - 09 Apr	Scandinavian Airlines
25 Mar - 13 Apr	Scandinavian Airlines
26 Mar - 16 Apr	Scandinavian Airlines

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

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.

Book a cheap hotel in San Francisco

Cheap car rent in San Francisco

Cheapest return flights from London to San Francisco in March from 330€

Return flights